MonsterGirlEncyclopedia

Imagine your typical RPG-style fantasy world, filled with monsters and adventure. Now replace all of said monsters with Cute Monster Girls, and throw in huge amounts of Fan Service and outright sex. The Monster Girl Encyclopedia is Exactly What It Says on the Tin, a bestiary dedicated to cataloging all the different kinds of Cute Monster Girls in the world. Naturally, the entries are filled with Fetish Fuel, and the text (and sometimes the art) of most are Not Safe for Work.

A compilation of translated entries for the Encyclopedia canon and canon settings books can be found here (needs registration in order to view the contents). New monster species are being added on a regular basis by the original creator, and this site is where the translated info is first posted (there are well over 200 profiles at present). One can also go to either Danbooru or Gelbooru for the newest additions to the list ( which may not even be translated into English yet), though some of what they feature may be outdated or inaccurate.

  • WARNING: The -booru sites contain NSFW material! Do not browse with touchy relatives present. ;)
  • Kenkou Kurosu/Cross, the artist's, page can be found here.
  • A MGE Wikia containing all currently translated material (from Monster Girls themselves to the background material) can be found here. WARNING: some of it's content is NSFW.
  • Another much-smaller attempt at an Encyclopedia from, apparently, the same artist as the Living with Monster Girls series.
  • An alternate (heavily outdated) site is here: http://mjm202036.pbworks.com/Monster-Girls-Encyclopedia

Also see Living With Monster Girl for a Doujinshi series with similar content.

Also, good news for English speaking countries: Seven Seas Entertainment has licensed the Monster Girl Encyclopedia. The two existing volumes of MGE entries are now available to buy in English. It is as yet unknown if Seven Seas will translate the settings books as well.

Another Story of Fallen Maidens, a game set in the MGE world and featuring the adventures of the hero Eristia as she explores various monster transformations, has been translated and can be purchased here WARNING: NSFW.

Note that due to the material having gone through a number of translators over the years, and an increasing amount of understanding from the English fanbase (and communication with Kenkou) regarding the best/intended ways to translate, one may find multiple translations for various terminology (for instance, the types of mana, namely monster mana and essence, were for some time always translated as demonic energy and spirit energy respectively, and continue to be on the MGE wiki, but not on Monster Girls Redux). This wiki will when possible use the terminology as translated by Seven Seas, since they are the ones who have been able to work most closely with Kenkou Cross.

Tropes used in The Monster Girl Encyclopedia include:

  • Abuse Is Okay When It Is Female On Male: Largely averted, even the roughest monsters would not intentionally do real damage to their husbands and they have many means of avoiding such a scenario. They recognize humans are mostly comparatively fragile, and act accordingly. That said, some, like the Ogre, treat sex like a battle, and it can get very rough while still being pleasurable.
    • Even the Dark Elves, despite being clearly designed to appeal to the BDSM fetish and noted as referring to their husbands as "slaves" are an aversion. Their whips for instance are enchanted to cause pleasure rather than pain, and they train themselves for years to ensure their various techniques conquer their partner with ecstasy rather than agony.
  • A Date With Rosie Palms: The Roper, a parasite that causes its host to sprout Naughty Tentacles, lures in mates by stimulating the host's genitals, causing said host to emit noises that lure in their targets.
    • It is also said that if a colony of Devil Bugs cannot find a male victim, they'll resort to this.
    • Merrows enjoy watching other couples, and will even trade their blood in exchange for saucy stories to stimulate themselves with later.
  • A Form You Are Comfortable With: Doppelgangers. They are shape-shifting spirits formed out of unrequited love, and turn into an idealized version of the woman their lonely male targets pine for. Subverted in that their true forms, short, flat girls in black dresses, are hardly maddening or awful.
  • Action Survivor: More like Sexual Survivor. The in-universe author of the encyclopedia managed to get deep into the Overlord's Castle and have an interview with her, and has encountered every monster present in the book. Sometimes he got attacked, but always "survived" (or at least, none have kept him as their husband) and continued working on the book. At the end of the first compilation book, he notes that the Order is hunting him now, so he's running to Zipangu. Since every entry for some time after Lilim (the final entry in compilation book) was a Youkai, it's obvious that he made it (and the second volume compilation confirms it). Of course, since he's writing an encyclopedia and working to correct people's misunderstandings toward monsters, the Overlord may be assisting him (we know at the very least her daughter Druella gave him sanctuary in Lescatie for a time). World Guide 1 also reveals he has a Leanan Sidhe companion who protects him from amorous monsters. The individual monsters he interviews for the profiles are also typically married, making it perfectly safe for him to get close to them.
  • Alchemic Elementals: All four of them are featured as monster girls, though the Salamander is replaced by Ignis. This is because, in this setting, Salamander is a relative of the Lizardman race.
  • All Chinese People Know Kung Fu: The Hinezumi, from the Mist Continent, are said to "excel at martial arts". Likewise, the Ren Xiongmao are said to be good at using a Bo staff in martial arts. MGE volume 2 postulates that many Mist Continent monsters are so good at martial arts due to the centuries-long three-way war between the three factions that rule the continent, they have evolved to accommodate the environment rather than rely on normal monster fighting styles.
  • All Women Are Lustful: Best case scenario. For monsters, lust, hunger, and love are all deeply linked concepts/desires.
  • Alice Allusion: For one, there's Alice-type succubi, the artwork for the Wererabbit also has her carrying a large pocketwatch. There's even a bit of dialogue in the book about this, including a portion of the world called Wonderland.
    • In addition, the Alice broadcasts a subconscious charm spell that makes men rape her, forcibly turning them into lolicons. This, and her appearance as a young girl, is possibly a reference to rumors of Lewis Carroll being a Lolicon himself, to one degree or another.
    • Wererabbits can locate random entrances to Wonderland (otherwise, one can usually only enter if invited by a resident of Wonderland).
    • There are several monsters based upon the Alice in Wonderland characters, such as the Mad Hatter, March Hare, Dormouse...
    • The Alice likes to chase after and play with Wererabbits.
  • All Amazons Want Hercules:
    • Orc and Ogre are usually dominating toward their husbands, but beat one in combat or during sex, and she will become an obedient wife/slave herself. More pronounced with the Orc than with the Ogre (the latter becoming even harder to handle during sex as she finds being overpowered very arousing).
    • Dragons have a tsun-attitude toward their husbands, treating them as precious treasures and refusing to let them out of their sight. They become full dere if they recognize the man as being a more powerful warrior than them (an admittedly rare thing given how powerful dragons are) and become subservient to him.
    • Lizardmen, Proud Warrior Race Gals all, will propose marriage to whoever beats them in a duel. And they won't give up even if the man refuses at first, following him around and waiting for him to change his mind. Salamanders are much the same, just more Hot-Blooded about it and caring more about how good the fight was rather than who won.
    • Baphomet, the most powerful monsters when it comes to physical might, turn men into lolicons regardless of their strength, but will often only accept those who beat them in combat as husbands.
    • Averted by the Amazoness, though. In their worldview, men are supposed to Stay in the Kitchen and support/heal their wives.
  • A Man Is Not a Virgin: Actually averted more often than expected. Many villagers in Order-controlled territories who don't travel can go their whole lives without ever even seeing a monster girl, and the skewed birthrate in humans of this world (heavily favoring males) means there are many men with few options for human female sexual partners. For monsters this is a good thing, as there are always many unmarried men to be found in human-controlled regions (married men who are captured in battle are released once it is safe to do so). Played straight in monster realms, where every unmarried man is likely to be snapped up by monsters in short order.
  • Amazonian Beauty: The Minotauri & Jinko are ripped, but like pretty much all monsters are still attractive.
  • Ancient Egypt: Represented by Anubi, Sphinxes, Khepri, Apophis, Pharaoh and Mummies. Their region is also a major part of events in the setting's ancient history.
  • And I Must Scream: Some of the monsters seem to do this, but when looked at closer it's often averted:
    • Alraunes tend to keep their husband bound inside their flowers, while dryads will fuse their man into the tree they themselves are fused with. However, the alraune can move about on her roots so the man can still be mobile with her (and she can take on a fully humanoid appearance via polymorph magic, letting the man go in the process), while dryads and their husbands can transport themselves into other dryad trees (the tree itself seems to exist as another dimension rather than simply the inside of a tree), forming an odd society of dryads and their husbands.
    • Some monsters will kidnap men and take them to Pandemonium where time is eternally still (though it is still unclear just what life is really like there, as there is apparently a type of fruit that grows there and gets exported out).
    • The Mimics, Jinns of the Jar and Charybdis lure men towards their hiding spot, and then suck them into an alternate dimension where they can perhaps be trapped forever.
  • And Then John Was a Zombie: Women who fight monsters are at risk of this happening if they ever get captured, eat the wrong things or stay in the wrong place for too long.
  • Angelic Beauty: Applies to the Angel and all of her subspecies: the Valkyrie, the Houri and the Cupid.
  • Animate Inanimate Object: In a sense, both the Chochin-Obake (a lantern) and the Karakasa-Obake (an umbrella), due to being based on the tsukumogami. And also the Living Doll.
  • Anime Chinese Girl: The Hinezumi and the Ren Xiongmao. And many other monsters from the Mist Continent.
  • Anything That Moves: It's mentioned that unmarried zombies can't distinguish a man from a woman, and so they'll pretty much violate both indiscriminately.
  • The Archer: The Elf and Centaur are both drawn wielding a bow and arrow.
  • Art Evolution: There's quite a difference between the earliest entries and the newest, and quite a few versions have actually been redone graphically, sometimes with very visible changes (the Lizardman, for example, lost a few inches, got more detailed armor, had her hands changed into more bestial claws, and... gained quite a few inches back).
  • The Assimilator: Dryads; any man they catch will eventually become a part of their tree in the same way the dryads are part of it, and, like the dryad, only die when the tree dies.
  • Atlantis Is Boring: Averted. Aquatic monsters are often just as lustful as those on land. And Sea Bishops can transform any man so he can live underwater freely, though they only do this to either aquatic monster's husbands or drowned men (Poseidon's power in the water keeps men from dying from drowning, putting them in a dormant state until a monster can find them, and transforms drowned women into nereids). Further, there exist many flourishing underwater societies of monster girls and their husbands.
    • The various Ryugujos (dragon palaces) found in the ocean waters around Zipangu are a special aversion, being basically cities that double as tourist theme parks for humans and monsters alike. Special magic in these cities enable the residents to enjoy the benefits of underwater and dry land life at the same time.
  • Author Appeal: The artist seems to love Horny Devils, considering how many monsters have been corrupted by them. And let's not forget the number of monsters that convert other women into their species, or the number that can be turned into more submissive versions...
    • And the fact most of them want to rape you.
    • Pretty much all monsters without animal ears of some sort have pointy ears, presumably due to this reason.
    • According to the author, the setting itself was made to provide a world ideal for people to have happy, pleasure-filled lives with monster girl wives, without having to worry about much else and without the "bad ends" common in most such worlds if one associates with sexy monster girls. Kenkou liked the idea of assertive, exotic monster girls, but didn't like how they were seldom viable targets for romance or happy endings. Likewise, the appeal of corruption in the setting is meant to be more about the transformation aspect rather than despair and horror, the terminology more meant to appeal to the fetish aspect rather than to a grimdark reality.
  • Bee People: The Honeybees.
  • Better Than Sex: Fully Averted. There is nothing Monsters like to experience more than sex, albeit there are still many things they like to do, being interested in pleasure and fun in general and many like to have variety along with their favorite thing of all.
  • Beware My Stinger Tail: Some monsters have various features to make their tails more effective weapons.
    • Salamanders have tails coated in magical flames, that in addition to reflecting their sexual and combat arousal will only burn what they intend to burn.
    • Girtablilu possess a scorpion tail with the most powerful paralytic venom of any monster (it also causes intense arousal).
    • Manticores have tails that end in a bulbous organ designed to suck on men's penises. It also has large spines on its surface that can be retracted or shot out as a weapon depending on what the manticore wants. The spines are laced with a venom that causes increased sperm production and, of course, arousal.
    • Chimaera have a tail ending in the head of a snake equipped with paralytic venom.
  • Beware the Nice Ones: Jorou-gumo appear sweet and alluring during the day, but at night turn into fierce rapists which will usually ravish their husband into a sub if he doesn't find it in him to ravish them during the day (which can cause them to enjoy being subs and reduce the amount of time they spend in their "night" mode).
  • Big Brother Attraction: A subversion. Though they're not related at all (usually), the lolis of the Sabbath all refer to their male partners as "Big Brother". This is probably just for cuteness value.
  • Bigfoot, Sasquatch, and Yeti: The Yeti monstergirl. Here, they are very friendly creatures that love giving hugs to anybody. They save frozen travelers by heating them with their own high body temperature, and if a man were to hug them back, they would see it as the man courting them.
  • Bizarre Sexual Dimorphism: The end result of the Overlord's plan would mean that humans and monstergirls are a single species with humans (including male elves and dwarves as types of humans) as men and all the various monster girl races as women.
  • Blessed with Suck:
    • You're a man in a magical land full of Cute Monster Girls which, presuming they find you attractive, are all willing and eager to have sex with you? Sounds fun, except some of them can be less then attractive unless you're into the fetish they represent, many of them aren't very big on the concept of "No", and pretty much all of them are very possessive. But then again. Rape Is Ok When It Is Female On Male.
      • Plus, if you happen to have an abundance of spiritual energy, you're probably an extremely powerful person or a mighty wizard... and you're going to draw eager, hungry monsters like iron fillings to a magnet, regardless of your attraction to them or desire to attract them.
      • There are various means available, thankfully, to up your odds or ensure you get the type of girl you like. Hakutakus, for instance, will readily assist such men in attracting a monster girl they want.
    • If you're a woman in this world, you can be turned into a Cute Monster Girl, gaining supernatural charm, confidence and beauty (along with other abilities). Unfortunately, not all of the potential transformations you can undergo are necessarily attractive to you (Roper and Dark Slime particularly), your personality changes when you are transformed (though there's a bit of a Broken Base on exactly how much is changed. See Draco in Leather Pants in the YMMV page) and, worst of all? Most of the monsters won't ask your permission first. On the plus side, many transformations are influenced by the nature of the woman being transformed.
  • Blob Monster: The Slimes and all their variants. They're essentially living goop that takes on the proportions of an attractive woman. Most types tend to be not very smart, and if their mass increases too much, they'll split off part of themselves as a new Slime.
  • Blood Knight: The Salamander. She doesn't care really if a man wins or loses when he fights her. So long as he can give her the most enjoyable fight possible and prove to be her most Worthy Opponent, she'll follow him to the ends of the earth, publicly declaring her love for him, until he agrees to be her husband.
  • Blue Eyes: The Yuki-Onna has a stunning pair.
  • Blue and Orange Morality: The monstergirls have different standards than humans, but from their own perspective aren't evil at all. To them, sex is as important as feeding (and in fact is the same thing, even for species that don't rely on man's essence), likewise to them Sex Equals Love (especially if they care enough to forgo sex with any other man for the rest of their lives), so they don't see anything wrong with raping a man they like. Especially since they still have the mindset of a predator thanks to the settings of the former age, and tend to see human males as prey in addition to being mates. Though there are a few who respect it if their husband is not in the mood. They are also hedonists who happen to be extremely depraved to the point where they don't condemn incest; so a monster child raping her father is not frowned upon (though it is still generally a rare event). Likewise, to them physical appearance doesn't matter (after all they have various means of improving looks and such after getting the man), so as long as the man is not irredeemably evil, he is potentially husband material (though many still have more specific preferences in men, even an ideal man they seek, though they can alter this ideal to match a man they come to love). However, they do love their husband immensely and would never dream of leaving him and consider killing humans to be abhorrent.
  • Bodyguard Babes: the Kunoichi are this to their husbands, as are soldier beetles and some other disciplined, protective monsters.
  • Body Horror: The Roper. A human woman infected with a parasite that causes her lower body to turn partly into slime and sprout long, pink tentacles. At least once the process is over the woman regains control over her body and can maintain a human appearance if she wishes to.
  • Bottle Fairy: The Red Oni lives to party and spends most of her life drunk or drinking.
    • Her cousin the Blue Oni is one too, just only when she's with a guy she likes.
    • The Satyros are more refined versions of this, favoring wine and intoxicated trysts.
  • Breast Expansion: Can happen when a human woman is monsterized, and is also part of the biology of certain races like flow kelp (her whole body getting larger when she absorbs moisture).
  • Brought Down to Normal: If a doppelganger's husband sees her true form, and loves her as she is, she will lose her shapeshifting ability, since she can't be herself with it. Not that she'd need it anymore.
  • But We Used a Condom: Word of God says that the monsters will end up poking holes in your condoms, or outright refuse to use them. It's very difficult for them to get pregnant to begin with, to reduce the odds further is thus frowned upon.
  • Came Back Wrong: Even the dead aren't safe from monster mana. Their souls can be corrupted and become Cute Ghost Girls, or their bodies can be revived as ghouls, zombies or skeletons.
  • Career Killers: A subversion with the Mantis. They don't kill people for money, but they are highly efficient hunters, nicknamed "Assassins of the Forest." A fellow arthropod monster, the scorpion girl Girtablilu, are nicknamed "The Assassin of the Desert" for similar reasons.
  • Cat Girl: The Werecat monster. Giving her catnip results in her raping you. Also comes in Ancient Egypt flavour with the Sphinx, Japanese flavour with the Nekomata and outright Furry with the Cait Sith.
  • Chest Monster: The Mimic and Jinn of the Jar are Cute Monster Girl embodiments of this. They pretend to be, respectively, a chest or a large pot, hiding in a pocket dimension within, but any man who messes with it is promptly "attacked". The Mimic pops out and uses magic to get the man to have sex with her, taking him back into the chest if she really likes him, while the Jinn of the Jar sucks him into the pot where her body unconsciously drives the man to have sex with her. Stick something into the Mimic's keyhole, or toss something into the Jinn's jar, and they'll leap out of their home and be helpless. Likewise, you can also just break the Jinn's jar, though this will leave them severely distressed.
  • Children Are Innocent: Subverted. Many of the monster girls are loli. Its also a simple fact of monster girl biology in the setting, being that monsters reach sexual (though not necessarily physical) maturity by the age of ten years at the latest, and some (like slimes) are sexually mature upon "birth," and mentally are similarly capable. A particularly notable subversion would be the Alice race of succubi, all of whom are loli and behave seemingly like innocent children (while still having monstrous instincts). The Alice subconsciously broadcasts a Charm Person spell that eventually Mind Rapes a man into raping her and becoming obsessed with following her as her lover.
    • Double subverted by Alice, as her mind will remain innocent as her memory will get reset after the sexual encounter (until she goes to Wonderland and matures into a complete Alice), though even without her conscious memory she will subconsciously grow more powerful and capable when it comes to sex.
    • There is in fact an entire section of the Overlord's Army filled with nothing BUT little girls, the Sabbath, whose motto is "To spread the charm and depravity of little girls!" That said, a majority of the members are not children, they only look like they are.
    • Human children (at least past a certain unknown age) are not off-limits, either, with the justification being that when transformed into a monster, the rules about human mental sexual maturity no longer apply (when becoming a monster, all they need in order to handle sex properly is basically transmitted into them via their monstrous instincts). As for male children, some monsters are noted to have a liking for shotas, to the extent that their eventual husband may well revert in physical age upon becoming an incubus (or remain the age she first bonded with him at, if that is what she wants).
    • Seven Seas translates most of the MGE material faithfully, making an exception only when it comes to most implications regarding sexual behavior with the underage. Information on the Sabbath, for instance, refers to the members as petite rather than looking like children.
  • Cthulhumanoid: The Mind Flayer and the "abyssal/chaos" monsters as a whole.
  • Clingy Jealous Girl: The Lamia and Medusa entries (and lamia family monsters in general) are noted to be quite possessive. They notably hate the idea of even other men seeing their husbands naked. The Lamia, in fact, will ravish an unfaithful husband until he's totally dependent on her.
    • Charybdises don't take kindly to Scyllas scooping up men they've dragged, or are dragging, down beneath the waves, but are usually too timid to actually confront Scyllas about it.
    • The Shirohebi as well, though she has a non-violent solution to it. If she suspects her husband may be cheating on her, she'll use her magic to make sure his urges can only be satisfied by her.
    • That said, even the most possessive monsters will accept their husband having a harem if other monsters fall in love with him, as they recognize a monster can't simply choose someone else once their bodies and hearts have come to see a man as their husband. Even so, they will compete with the other wives and try to gain a dominant position in the harem. Until this is all worked out the competition can be quite hard on the man's body.
  • Clone Degeneration: The loli-centric Sabbat created a special medicine to let Monster Girls live out gang-rape fantasies, the so-called "Doppleganger Medicine" (no relation to the MG of the same name). When given to their boyfriend, it splits said man up into numerous, sense-sharing clones based on how much is taken. However, the more clones there are, the more they all devolve into sex-crazed, bestial rapists for their girls' pleasure until the effects wear off.
  • Continuity Snarl: A lot, actually. A combination of different translators that don't always keep the correct meaning, outdated content, exaggerations, in-universe propaganda and statements of the author that don't always correspond with what's written in official materials make it difficult to determine exactly how to view the setting. A lot of this has been ironed out though as communication with Kenkou and the translations in general have improved. Overall most up-to-date material is quite reliable in its continuity.
  • Corrupt the Cutie: Absolutely EVERYWHERE, to varying degrees and in varying ways.
    • Chaste Hero: No matter how negative or apathetic your view on sex is, getting monster mana forced into your body will turn you into a sex maniac monster girl/incubus. Followers of the Fallen God especially enjoy corrupting the chaste and virtuous, including Angels, while Succubi find corrupting the normally stubborn, fastidious Elves to be most entertaining. That said, even monsters can behave in a chaste manner outside the bedroom, depending on their particular personality and the tastes of their favored man. The Chaste Heroes of the setting just tend to be particularly repressed people, and thus likely to become quite wild sexually at least until they get used to their new monstrous bodies.
    • Alice succubi can't remember anything about sex, so they mentally remain like innocent children. Their bodies, however, gradually become more and more responsive and capable after each sexual encounter. And their "husbands" are often those who have had their Big Brother Instinct slowly turn in a rather different direction because of the Alice's natural charm magic. It is said every Alice eventually takes a journey to Wonderland, where their adventures there cause them to become complete Alices, no longer forgetting sex and regaining all memories of their past sexual encounters.
    • Elementals start out as sapient manifestations of energy that are without a stable physical form, and are curious about sex (and desire romance) but incapable of having it. However, once monsterized they can and do have sex, and as they continue to have sex with their contracted elementalists, they will slowly become corrupted by their monster mana, eventually turning them into dark elementals. Furthermore, since they're elementals, as dark elementals, their corruption will change the natural elements of the nearby physical world as well, transforming it into a fragment of the Monster Realm. This isn't seen as a bad thing by the elementals though, since such realms are rich in life and energy. Monsterization is likewise not seen as bad by them, as it allows them to do so much they could only dream about before.
    • The background story of the fairy kingdoms notes how fairies were originally just innocent creatures who loved fun games and sweets. They mainly stayed in their own dimension and rarely interacted with humans. But after the age of monster girls began, the fairies began to befriend monsters that had similar child-like, fun-loving personalities, namely pixies and imps, and as their magical energy got mixed the fairies were monsterized. Then the pixies and Imps taught the fairies about sex with humans, telling them how its another fun and addictive game...And it's true, not to mention men's essence is the best sweet the fairies ever tasted. Their mindsets remained mostly as innocent children, but their behavior changed greatly.
  • The Corruption: Basically, monster mana changes surrounding land and living things to become more suitable for monsters and humans/incubi to live together. How it does this and the end result varies greatly with the particular nature of the individual monsters and incubi. Further, after a lot of exposure to monster mana, females of non-monster sapient races will find their own mana altered into a type of monster mana, becoming monsters themselves by definition even when their physical form doesn't change (as is the case for elves, fairies and dwarves).
  • Counting Sheep: The Weresheep has enchanted wool which makes those who come into contact with it drowsy, including the Weresheep themselves. It won't outright put you to sleep but enables you to easily go to sleep.
  • Covered in Gunge: The various slime monsters' preferred method of catching men.
  • Covert Pervert: The Sea Bishop, who doesn't even actively seek out a husband and only gets one when she has to transform him in order to save him from drowning, secretly takes notes from the couples she marries and, once she has transformed a drowning man, eagerly pounces him to try everything she's learned with him.
    • The Nightmare is an inversion of this. She appears as a strong-willed and lustful woman in her victim's dreams to assault her target, but the real Nightmare is an extremely timid centaur-subrace which will get paralyzed with fear simply by getting touched in the real world. But, as time passes, she'll become less and less covert.
  • Crapsaccharine World: The changes that the Overlord makes causes the land itself to become benevolent towards it's inhabitants instead of apathetic, and the physical changes brought about by monster mana mean that everyone is HOT. Though this may seem like a great universe to live in, there are several elements of Fridge Horror to the series. Rape happens so often that it's not even considered particularly negative (though it mostly happens in places where it's the only way a monster can get a man), monster mana screws with people's heads, some of the gods are jerks or outright evil, and if the current Overlord is killed, the universe will fall back into a vicious cycle that nobody benefits from. That said, its clear that despite the obstacles, the MGE world will have a happy ending, at least on its own terms of happy.
  • Cuddle Bug: The Yeti love giving hugs to anybody. However, they especially like it if someone hugs them back. Other monsters noted to love clinging to men they like include weresheep, greenworms and flow kelps.
  • Cute Bruiser: The Goblin is a loli who happens to be several times stronger than a fully grown man. Now in Oppai Loli variety with the Hobgoblin (which are even stronger).
    • Also Baphomets, the most powerful monster race when it comes to physical abilities, and the strongest of them is the leader of the loli-cult called the Sabbat.
  • Cute Clumsy Girl, Dojikko: Hobgoblin. To quote her entry "However, perhaps because the enlarged portion of their bodies robs them of nutrients, they're often slower in the head than normal goblins. They're simpler than goblins, and perhaps because of the weight of their huge breasts, nowhere near as agile. When the goblins who formed a gang chase the man around, they're always the ones lagging behind. They're often observed falling down during the chase too.".
  • Cute Ghost Girl: Naturally.
  • Cute Monster Girl: Goes without saying. The entire purpose of the Encyclopedia is to catalog each and every one, and considering the number of monsters in popular culture, it isn't even half done yet.
  • Cute Witch: The Witch entry, natch. And all of them are loli.
  • Dark-Skinned Blond: The Amazon, Dark Elf, Jinn of the Jar, Dryad, Girtabilu, and Ghoul all have dark skin and light colored hair.
  • Death by Sex: Amazingly enough, totally averted; none of the Horny Devils will kill you via sex.
    • The Succubus Notebook reveals that the succubi of the former era often played this trope straight, milking captured men of essence until the men died. Over the years succubi developed as a culture and came to desire ways to make their meals last longer, be higher quality, etc. some even becoming able to genuinely love the men they fed on. Succubi learned how to make "prisons" to house captured men and provide for their needs, but milking them to death was still a ever present problem. Making going this far be physically impossible for monsters to do was one of the major changes the Overlord brought about when she came to power, so now monsters can feed to the limit on their husband via sex without worrying about overdoing it. Instead the man simply passes out once all the mana the monster can take is consumed.
    • In the former era, some races such as lamias and harpies still depended on human men to reproduce. However, no love was involved, and the men were typically killed once fertilization was guaranteed. That said, some members of these and other intelligent races were able to overcome the god-instilled instinct to kill humans, coming to love them instead and becoming sort of a married couple.
    • Avoiding this trope was one of the main motivations for the author to create the setting, as he loved the exotic and powerful monster women in various fantasy settings but didn't like how in most of them sexual relationships were either not possible or tended to end in depressing/deadly ways.
  • Deus Sex Machina: Originally, even the power gained by attaining the position of Overlord was not enough to stand a chance against the Chief Deity in battle, nor did the title give the power to change the settings of the world that the gods had ordained. However, since the current Overlord is a succubus (the first one to ever hold the position), she gained immense power by having sex with her husband, a hero-turned-incubus. When the Chief Deity decided to deal with the Overlord herself, the couple had more than enough power by that point to badly injure her. There were other factors to the Overlord's successes, but sex was a major part of it.
  • Did You Just Punch Out Cthulhu?: Mentioned above, the Overlord and her husband beat the current Chief Deity, successor of the supposed creator of the setting's world.
  • Difficulty Spike: Mentioned in the background materials. Heroines starting their quests have a much easier time of it than heroes, since most monsters have no interest in women. Things change for the worse in a Monster Realm, where many monsters capable of transforming human women live, and Tentacle Forests will violate and transform any human girls that wander into them. The worst part is, since female humans draw mana from their environment, they will slowly absorb the monster mana of a Monster Realm instead and will become succubi (or whichever monster mana dominates the area) should they stay in a Monster Realm for too long. Heroes will have a much less steep difficulty spike: every monster will be trying to get into their pants from the start, but they will gain mana by eating and resting, and so far, there is no word that tentacles necessarily have any interest in solo males, so there may not be any new challenges in the Monster Realm as long as they can repel monsters and have a supply of clean food save that they will encounter more monsters, and more powerful types thereof. That said, while it may take longer, men will also be transformed by staying in a Monster Realm, becoming incubi and having their values toward sex with monsters become very positive.
  • Dracolich: If a Dragon dies without ever taking a human mate, her regrets will cause her to be resurrected as a "Dragon Zombie." They generally have the same disposition as humans turned into zombies, i.e. endlessly craving sex.
  • Dumb Muscle: The Wurm is said to have immense strength and durability, as well as unlimited stamina. They are even said to uproot entire forests just because they were in the way. However, they are not intellectual by any means.
  • Eldritch Abomination: A passing hint was given in background story about the sea, about Monsters of Chaos, a special subset of extremely powerful monsters that once divided up rule of the sea with Poseidon and were sealed away at the bottom of the ocean after a war. They remain there in the abyss, beyond Poseidon's influence and where no normal monster dares go near. They too, it seems, became women, but the truth is uncertain. Most of what is known about them has to be inferred from monsters they created that later left the abyss (shoggoths), monsters that worship them and were changed accordingly (mindflayers) and monsters that seem closely related to them (wendigos, atlach nachas, night gaunts). The uniting features of the chaos monsters and their kin seem to include that they physically transform their husbands and can then fuse with them in various ways (the husbands can change back to human form at will), and that they have a bit of an alien mindset compared to other monsters and humans, a mindset their husbands come to share.
  • Elemental Embodiment: The Gnome (Earth), Ignis (Fire), Sylph (Wind) and Undine (Water) monster girls that can impart elemental powers to contracted human partners. Also overlaps with Horny Devils, as when monsterized they're also partially embodiments of pure "monster mana"; if they have enough sex, they become "corrupted" and start broadcasting huge amounts of this energy, transforming all the men and women within miles of them into incubi and succubi as well as the land itself into a monster realm. Lastly there is another group of elementals called "demi-elementals," defined by them having been born as monster races to begin with (rather than elemental forces that were later monsterized) and not forming covenants. Demi-elementals include:
    • The Lava Golem is a Lava Demi Elemental.
    • The Dryad is a forest demi-elemental.
    • Kitsune-bi are demi-elementals formed from excess mana from powerful fox monsters.
    • Ice Queens are demi-elementals of ice that rule over frozen regions.
    • Glacies are demi-elementals of ice that are created by Ice Queens.
    • The Yuki-Onna are demi-elementals of ice that are native to snowy mountains of the Zipangu region.
    • Apsara are demi-elementals of milk, sacred life-enhancing milk that is.
    • The Dark Matter are perhaps a unique exception. Because they were a monster race from the start, they should count as demi-elementals. However, they are able to form covenants, leading researchers to speculate they are a fifth type of pure elemental, one embodying the "dark" element.
  • Elves Versus Dwarves: True for this setting, the races having had a number of wars through history. Even the ones that have been turned into succubi tend to snipe at each other and fight over men. For some reason, succubi elves and dwarves often target the same men. Fortunately, their "fighting" consists mostly of squeezing the man between them while insulting each other.
  • Embarrassing Tattoo: A subversion. Many monster girls have intricate, quite stylish tattoos across their bodies (often featuring the MGE's trademark heart-symbol). MGE volume 1 revealed these to be "Pleasure Runes", a magic which ups the sensitivity of any monster girl to pleasure (the runes also can be applied to and work on incubi). The larger, more numerous and more covering the tattoos, the more sensitive they become. Having too many of these thus has the side-effect of making it... difficult to go about normal activities when the slightest touch can bring you to your knees, quivering in pleasure. For this reason, only monsters that have abandoned living regular lives, like Dark Angels, cover a large portion of their body in such tattoos, others, like succubi, cover enough to enhance sex while still allowing for normal lives. Its noted though that even a single rune would be too much for a human to handle, their minds would be overcome by the levels of pleasure a monster can easily enjoy, and they would only be able to function again once monsterization is complete (the mana in the rune would likely transform them by the time it was done being applied).
    • One of the Sabbat's most impressive accomplishments was research which allowed them to engrave the tattoos on clothes, letting girls remove the sensitivity-increasing runes if they wished. It also let the Sabbat cover themselves in more than their small bodies would normally allow.
  • Empathic Shapeshifter: Doppelgangers. Affection-based. See A Form You Are Comfortable With
  • Enthralling Siren: A kind of Harpy with a beautiful singing voice. They wear clothing reminiscent of an Idol Singer and share similar traits with other harpies.
  • Erotic Eating:
    • Applies to the way many monster realm fruits and veggies are intended to be eaten. Some are even used as practice/training tools by monsters for future sexual encounters.
    • A subversion with the Ghoul. Her mouth has evolved to be so sensitive, that it's considered a sex organ all it's own, so anytime she puts something in her mouth is either masturbation or sex.
  • Everything's Better with Cows: Holstaur. To quote her entry "She, even as a child, develops nutritious milk. This milk increases the amount of mana a man has, and promotes great health. This is of great demand among monsters, in order to make their husbands stronger and healthier, and sells very quickly, even among humans. She produces enough milk, that two people can live off of it alone.".
  • Everything's Better with Monkeys: Averted with the Kakuen. They're intelligent yet selfish Jerkasses, and very lustful.
  • Everything's Even Worse with Sharks: The Mershark, a mermaid variant noted to be far more aggressive when it comes to mating than normal mermaids. Averted, though, in that outside of sex they are some of the sweetest girls around, even being so determined to help people in trouble that they sometimes get to them before sea bishops do. It seems they do this in part due to guilt over what their species was in the former era (when they were basically living weapons).
  • Everything's Squishier with Cephalopods: The Scylla, Kraken and Mind Flayer. They all make heavy use of their squishy bodies to pleasure their husbands.
  • Everything's Worse with Bears: Usually averted by the sleepy, dopey Grizzly monster, as long as she hasn't been noshing on Honeybee honey.
  • Expy:
    • The way Pixies dress is very similar to the Shin Megami Tensei Pixie.
    • As a heroine, Wilmarina from Fallen Maidens looks suspiciously like Miki Sayaka.
    • Baphomet seems to be based on her monstrous counterpart from Ragnarok Online.
    • Kunoichi has been compared to the Ninja from Disgaea quite often.
  • Face Full of Alien Wingwong: An Inverted Trope - monsters do rape people, but because its Female On Male, the action goes the other way around where monsters reproduce by impregnating themselves with human males. Played straight with more parasitic types, namely Ropers, which can also reproduce by planting a seed/egg inside a human woman (though they don't implant via the face).
  • The Fair Folk: Sort of. Fairies & Leanan Sidhe aren't aggressive and are only "dangerous" when monsterized. Played straight with the Pixies, however, who are actually typed as "Demons" rather than "Fairies". Even the pixies follow the general monster rules though.
  • Fairy Sexy: All the varieties of fairy might count to one degree or another, though many are child-like. The Titania, however, certainly counts. Their beauty is even described as "breathtaking".
  • Fallen Angel: What happens when Angels get corrupted by succubi. At first, the corruption twists their minds into thinking that sex is a proper reward for good deeds done by mortals. For a time, they still believe that they're doing holy work, rewarding good-doers with pleasure using their body. Eventually however, they will realize their own desire and fully transform into dark angels.
    • Downplayed with the Houri and Cupid. As servants of Eros, they're already so much like monsters in mentality that corrupting them hardly makes any noticeable difference.
    • Monsterized Valkyries only become "fallen" (i.e. dark) if they recognize the voice of their own sexual desires before their transformation into a monster is complete. Otherwise they remain looking (and in many ways behaving) as they did before, albeit no longer serving the Chief Deity.
  • Fallen Hero: The Overlord's army has whole units made up entirely of examples of this trope. Just like the Fallen Angel above, these people were heroes who failed their mission to slay the Overlord or take back monster-controlled lands. Men have been charmed and women made into monsters (most often succubi), and they have now reformed their parties under the command of the Overlord. Although they're probably the most powerful fighting force in the Overlord's army, the former heroes are usually too busy with their heroines and only see actual combat when it represents a serious threat to the Monster Realm. Finally, the Overlord's husband is a mighty hero, likely the most powerful "human" in the world. But considering his motive, it's arguable if he's really fallen, aside from in the eyes of the Order.
    • The primary subject matter of the latest book released by the artist of the series, titled: "Monster Girl World Guide: Fallen Maidens".
    • MGE volume 2 further details how this all works. Basically, it is an accepted rule that married monsters and their mates in the army will be stationed together and not deployed on the front lines, enabling them to spend as much time together as they want, while still being available to help in emergencies. The front lines consist mostly of unmarried monsters hoping to find a man.
  • Fan Girl: The Shirohebi becomes this to the man she falls in love with. She'll follow him around showering him with love and affection until he caves and gets with her.
    • Also the Nureonago, but she's more devoted and docile (in a sense) than the Shirohebi.
    • A Salamander will happily pursue a man who has captured her heart, proudly declaring her love for all to hear until he gives into her.
  • Fantastic Arousal: Many monster-girls, naturally, have extremely bizarre turn-ons and ways of showing it.
    • A succubus' horns are erogenous zones, and they enjoy having their horns squeezed and caressed by their mate.
    • Likewise, the heart-shaped tip of a succubus' tail is sensitive to pleasure, and they will play with it as a form of masturbation. They also have a number of cultural habits associated with it. They will gently wrap their tail around a man they like, and if he touches her tail it will be interpreted as an invitation to have sex. If he touches the heart-shaped tip it will be interpreted as courtship behavior and a marriage proposal. On the other hand, a succubus would never intentionally let a man she is not interested in touch her tail.
    • Ryus have a single scale, located somewhere under their rear, that grows backward. If this scale is touched by a man it will cause such a rush of pleasure that it sends the ryu into a lustful frenzy, wrapping themselves around the man and ravishing him nonstop until they are satisfied.
    • A sustained look at the color red will overwhelm both holstaurs and minotaurs with lust, again directed toward their husband or a man they like assuming they have one.
    • Lamia family monsters shed the skin of their snake half on a regular basis, and this induces a state of extreme arousal where their entire snake portion becomes an erogenous zone and they eagerly take advantage of the enhanced pleasure they can experienced at this time from their husband.
    • In addition to treating it as an expression of love toward him, Girtablilu find the act of stinging their man to be very pleasurable.
    • Basilisks wear masks not just to keep from using the power of their eyes on people unintentionally, but also because directly catching sight of a man causes them uncontrollable arousal that leads to them ravishing him. Conversely, while wearing the mask they are very vulnerable to being incapacitated by arousing stimulation, simply sniffing a man up close or having him whisper in their ear being enough to make them turn bright red and collapse.
    • As an aversion, a mershark that gets too wild during sex can be calmed by having her head patted/caressed.
  • Fantasy Kitchen Sink: Dragons, Mummies, Slime, Oni, Harpies, and that's just to get you started. And I do mean ALL kinds of fantasy.
  • Fantasy Pantheon: So far, we have the Chief Deity (who at first seemed to be based on the Abrahamic YHVH, although background info revealed that it's really a title and the current Chief "God" is a comparatively recently appointed goddess), Poseidon (who governs the oceans), Ares (a war goddess), Bacchus (deity of Alcohol), and Eros (love goddess) (all goddesses, albeit its unclear even to the setting writer if Bacchus is male or female as people claiming to be them have appeared in both forms), Bastet, a Cat Goddess, and the Fallen One (a high rank goddess who resides in Pandemonium).
  • Fantastic Racism: The pure elves consider humans, dwarves and any monsters to be lowly creatures and loathe to make contact with them, so they rarely get far from their Hidden Elf Village. Dwarves feel insulted by this attitude and hate them back. Meanwhile "Execute on Sight" warrants are issued, and monsters are hunted wherever the Order has strong influence, with some exceptions in less strict areas and sometimes with particular monster races.
  • Fauns and Satyrs: The Satyros; they're followers of the God of Alcohol and love to drink and brew wine, play their flute, and have sex. Surprisingly given their origin in myth, their patron god encourages a lot of civic-minded behavior, and the satyros often work as missionaries for them.
  • Fiery Redhead: The Ignis is not only this, she's literally on fire.
  • Fisher Kingdom: The Monster Realm (a name for actually a collective of many different sorts of places, all defined by how monster mana has changed the spiritual makeup of the land). It's full of monster mana, so any normal human inside will become more lustful over time. Women naturally draw in energy from their surroundings when they expend it doing anything from fighting or casting magic to just breathing (as opposed to men and monsters, who only recharge from their own reserves by eating and resting). When her human essence/mana is completely depleted and replaced by monster mana, she becomes a Succubus (or a member of whatever race's mana dominates the area). Of course, by that point, she'll probably already be caught and transformed by a Succubus, a Vampire, a Dark Slime, a Dark Matter, or turned into a Roper after wandering into the Forest of Tentacles, or any one of a hundred other things...
  • Flower in Her Hair: Trolls, due to the fact that flowers tend to grow on their bodies. Also the Fairies.
  • Freakiness Shame:
    • Trolls are sensitive about their oversized hands & feet, and try to cover them with flower decorations.
    • Tentacle monster girls find their ancestral compulsion to tentacle rape women to be quite embarrassing.
  • Fully-Clothed Nudity: Inverted. Many monsters are actually naked, using retractable fur or scales to preserve their modesty. With a number it can often be hard to tell if what covers parts of them is clothing, or part of their body that resembles clothing.
  • Gag Boobs:
    • The massively well-endowed Holstaur uses her breast size as a form of communication. If she presses her breasts against you, it means she likes you. If she presses them against you firmly it means she wants sex. Now. Likewise, if you rub her breasts while she does this, she'll see it as returning the affection and will be very happy.
      • The Holsty's breasts are so impressive that even the loli-fication magic of the Sabbat cannot shrink them. Any attempts at turning a Holstaur into a loli have resulted in oppai-lolis. This was performed by the Baphomet Leader herself, and she considers it a personal Epic Fail.
    • The Hobgoblins are inferior to normal Goblins in every way except strength. They're The Ditz and Dojikko, yet ordinary Goblins will follow them around because they think "bigger things are amazing, so big breasts are amazing."
  • Garden Garment: While Trolls have flowers growing on their bodies, they also decorate themselves with foreign flowers. It's mostly to draw attention away from their large hands and feet, as well as cover up their strong body odor (despite said odor not being unpleasant).
  • Gender Bender: Fairly rare, but with some exceptions. For instance, it is normally not possible to change the sex of a person by raising them as an undead, but a female skeleton monster can be made from male human bones (and will have warped memories as a result), though whether or not this is really a sex change is debated in-universe (since skeletons can be argued to be golems that use human bones as building material).
    • The Alp is a Succubus that was once an Incubus. A Homosexual Incubus or one that desired to be a girl. Their desire to be with men (or to be a woman) was so great, they (sub)consciously destroy their own ability to produce essence and thus turn into a monster girl, afterward, they cannot physically be distinguished from a normal succubus aside from potentially in behavior, and any children they have will be regular succubi.
      • Can also happen with guys who are in the closet, whether they know it or not.
  • Genius Bruiser: Baphomets. They're leaders of the Sabbat cult (see Mad Scientist below), and are stated to be the most powerful monsters when it comes to physical abilities, while also being pretty adept at magic.
  • Getting Smilies Painted On Your Soul: One interpretation of what monsterization or becoming an incubus does to people. The monsters would maintain they are just showing people the truth about themselves, removing ignorance to pleasure, etc.
  • The Ghost: So far, we've yet to see any of the major characters from the background setting info actually depicted in art, like the Overlord and Poseidon, and personal accounts of them are scant. There have been some physical descriptions of some of them though (namely the features lilim share with their mother).
  • Ghostly Goals: Subverted. It's said that ghosts can move on should their business on Earth be done. However, in this world, all ghosts share the same goal, to keep having sex with the guys they like (and given they can keep a man even when he becomes a spirit as well, they need not ever leave).
  • Giant Spider: The Arachne, Jorou-gumo, Ant Arachne, Ushi-oni and the Atlach-Nacha.
    • The Arachne is your basic "woman's upper torso where the head should be on a Giant Spider", who is something of a bondage-dominatrix due to being aroused when men struggle.
    • The Jorou-gumo is a more Japanese-themed version of the first, who acts as a Yamato Nadeshiko by day but at night turns into an MGE version of a sadist (i.e. no actual pain) that ties down a man she wants and ravishes him until he loves submitting to her.
    • The Ant Arachne is a type of arachne that mimics giant ants in order to mooch off their colony's work, find a home, and snag a man for themselves from those attracted by the ant's pheromones.
    • The Ushi-oni, having the lower torso of a giant tarantula, is the only one to have inhuman hands, is a violently lustful wandering rapist-monster girl, has a Healing Factor, and is the only one of the "Arachne" family known so far to transform human women into more of her kind.
    • The Atlach-Nacha is based on the Eldritch Abomination of the same name, and actually looks more human on her own than the others. This is because aside from extra eyes and some spider legs on her back, the giant spider parts of her consist of her transformed husband, she standing in a pouch formed on top of his body.
  • Go-Karting with Bowser: Even The Order tolerate some monster girls, at least in less strict Order-aligned countries.
    • Apsara are protected from attack due to their association with the goddess Eros (their temptations seen as trials), as are the gandharva in some regions (where they are declared divine beasts rather than monsters).
    • Kobolds are also tolerated as they are seen as mostly harmless pets. Mostly. That is its illegal to mate with them, but that doesn't mean people don't do it anyway and that the kobolds encourage it.
  • Godiva Hair: The Alraune, Nereid and Kejourou. Though in the latter's case, it's Justified.
  • Golem: The ones appearing in the Encyclopedia are made as statues with the forms of attractive women, and they serve as semen/essence collectors to supply monsters that have no husband or access to men but want the boost in power and health that essence brings. Should a golem fall in love with a man, she will remove the control runes that dictate her behavior on her own, then rewrite them to ensure her lover becomes her new master.
  • Gorgeous Gorgon: The entire Encyclopedia probably qualifies, but the Lamia family monsters are the most literal examples.
  • Green Thumb: Trolls can cause plants to grow in even the most hostile of environments. They even have flowers growing on their body.
  • Happiness In Slavery: Both the Chochin-Obake and the Karakasa-Obake, due to being tsukumogami, desire to be "used" by men more than anything. Though how friendly they are depends on how they were treated when they were still lifeless.
  • Hard-Drinking Party Girl: Both the Red and Blue Oni's practically live exclusively off of sake, and love to hold drinking parties. Likewise the Satyros, being followers of the God of Alcohol, pretty much spend their free time drinking wine, making music and having sex (though they are also noted for civic-minded and enterprising habits).
  • Harem: While they themselves are always faithful to their single husband, most monsters have no problem sharing a man if they love him equally. Some, like Werewolves and Goblins, naturally do this, while others, like Lamia, are very opposed to it (though still able to accept it, as they recognize a monster can't simply stop loving a man she regards as her husband). All that said, a majority of monster species practice strict monogamy.
  • Harem Seeker: The Bicorn, as opposed to the Unicorn, actively tries to form a harem of monster girls to satisfy their husbands and their own kinks (they love the taste of their husband's essence mixed with the mana of other monsters).
  • The Hedonist: Pretty much all mamono are by nature eager to indulge in pleasure, sexual pleasure especially. Their standards regarding the specific forms this hedonism take on the other hand vary widely across different races and individuals.
  • Hell Hound: Yes, there is one. Said to be so ferocious and strong-willed not even the god who created them could tame them, though like all monsters, have a lot of affection towards their husband.
  • Hermaphrodite: The giant slug species used to be this.
  • Hidden Buxom: If you look closely at the redone version of the Yuki-onna you can tell that she's just as stacked underneath that kimono as many other monstergirls.
  • High School AU: There are five spin-off profiles, "Succubus Eroge Heroine", which depict archetype Eroge high-school girls of a modern world turned into succubi.
  • Horny Devils: Not only is there the basic Succubus (the race that is stated to now define all monsters), there's also multiple different variants.
    • The Alice is a rare mutation of the Succubus that looks and thinks like a pure and innocent young girl, but she exudes a mind-warping aura that eventually causes any man too close to lose his mind and rape her -- and her instincts mean she can handle and enjoy the sex, plus the man then becomes her husband and protector. After the sex, she forgets all about it even as her body is restored to its virgin state (though she retains a fondness for the man, and eventually she travels to Wonderland and unlocks her memories).
    • The Amazoness is basically a Hot Amazon Succubus with an appearance that invokes Nubile Savage and that lives in a society that is one part Boobs Of Steel to one part Amazon Brigade. Most of them have asymmetrical looks (i.e. one wing and one horn) and favor physical abilities over magic.
    • Alps are succubi that transformed from men who either were homosexual and/or wanted to be women. Physically there is nothing inherently different about them from the normal succubus race, and their children are regular succubi.
    • Dark Priests are Succubi that attempt to convert men to worship of the "Fallen God" through preaching and sex, dressing up in sexy nun outfits to boot. They are characterized physically by fairly small, feathery wings, and horns that curve to resemble or accentuate the look of a nun's hood.
    • Demons, formerly the parent species from which succubi evolved, are now considered a succubus subspecies. They are characterized by blue skin, black sclera, and a more extreme ideology than the average succubus when it comes to monsterization.
    • Imps aren't Succubi, but adopted the same feeding habits when they became monster girls (all monsters can and love to feed on men's essence, but only some make it their main diet).
    • Kunoichi are succubi that arose when the women of the unique culture of hidden ninja villages in Zipangu were monsterized. These succubi lack wings but possess incredible physical abilities, as well as various magical ninja arts. They also retain many aspects of the ninja culture in their behavior and practices.
    • Nereids are sea succubi, and are the typical transformation of women who drown in the ocean (Poseidon's power transforming them so they do not die). In their normal state they have fins instead of feet at the end of their legs, but like most other succubi they can readily use magic to disguise themselves as humans (and in their case to move easily on land). They lack wings, and their tails end in a large split fin rather than a spade shape.
    • Night gaunts are Eldritch Abomination succubi, with the requisite alien mindset and behaviors. Their husbands can transform to replace and become their wings, tail, and latex-like body covering.
    • Lilim (who are the direct biological children of the Overlord) are basically super-succubi, on the same level of power (or higher) as the highest tier monsters, and with beauty that can enthrall a man even without the use of a charm spell. They inherit from their mother a connection with the mana of all monster girl races, and thus the ability to transform human women into all kinds of different monsters (there are some limitations, depending for instance on the potential of the woman and the power level of the particular lilim). They also share with their mother white hair, white wings, and red eyes.
  • Hot Amazon: Surprisingly not the Amazoness unfortunately (not the profile art individual anyway, Kenkou has noted many amazoness are quite muscular). However, the Jinko and Minotaur races are both very muscular Amazonian Beauties.
  • Hot-Blooded: The Salamander, somewhat literally as well as metaphorically, and the Ushi-Oni in a dark, twisted kind of way. Many monsters in general are noted to be this way, enjoying exerting themselves both in sex and in hobbies.
  • Human Mom, Nonhuman Dad: Inverted. All of the monster races depend on human males to reproduce. The background material proclaims that this inversion is the core of the current Overlord's plan for peace; though she doesn't yet have enough power to make monster-girl couplings produce anything other than more monstergirls, she intends to make it so that they give birth to incubus sons as well. In essence, humans and monsters will become different sexes of the same species.
  • I Am Legion: Slime Queens, a mutation prevents them from properly dividing like other slimes do to reproduce. Instead they produce subunits of themselves to perform tasks their main body can't (as it typically becomes comparatively large and slow), and will sometimes grow to resemble large villages or even kingdoms of slimes (even trading with other villages!). Such large masses inevitably already have a "king" living there, supplying them with energy to maintain such a huge form, but the kingdoms are not necessarily safe for single men to wander into, as regular slimes often live there as well and it can be hard to tell them apart from the divisions.
  • I Just Want to Have Friends: Wererabbits. They're described as "lonely", and if they make a friend, they will not ever want to be separated from them. It's even worse, if the rumors that Wererabbits can die of loneliness are true.
  • I Love The Dead: Played with. Here, the dead love you.
  • Imprinting: What determines if a man becomes a monster's chosen husband. Any ceremonies are just for show (though many monsters still enjoy having them). What requires/causes the imprinting varies to a degree depending on the monster and individual, but a monster knows it has happened when her sexual desires and taste for essence come to focus on one man to the exclusion of all others and when on an emotional level she regards him as the only man for her, her body in a rather literal way remaking itself so that she is a perfect physical/spiritual fit for him and he for her, ensuring the best sex and best-tasting energy.
  • Interspecies Romance: A rather explicit (and not necessarily consensual on the male side) version, but the basic principle behind the setting.
  • Instant Awesome, Just Add Ninja: Succubi Kunoichi, who have been compared to the Disgaea Ninja many, many times, and may become Ninja Maids if they "Assassinate" a high-profile target.
  • It Amused Me: The Fairy Queens do nothing to stop the corruption in their dimension, as they enjoy how it increases the amount of fun everyone there is having.
  • Jekyll and Hyde: The Jorou-gumo. During the day? The sweetest, nicest girl you could hope to meet. At night? A sadistic, raging, rape-happy nymphomaniac.
    • Technically the Holstaur as well. Ordinarily sweet, gentle and placid, they become savage, brutal and as lusty as their Minotaur cousins if they keep looking at the color red or go too long without sex.
    • Also the Weresheep. Normally, they're quite calm and friendly, but that's only because of the tranquilizing effect of their own magical furs. Once their fur is shaven off, they become very vicious. This is actually important for their emotional health, if they are prevented from either performing or experiencing frenzied sex after being sheared it can lead to depression and low quality wool.
    • Trolls as well. Normally they're friendly and harmless. But if they spend too much time in sunlight, the monster realm plants on their bodies cause them to become very horny and even stronger than normal.
  • Jerkass Gods: The Chief Deity may or may not really love humans, but her (the current chief god is female) hatred of monsters only serves to justify the extremism of the Overlord. She's apparently unwilling to accept the changes to the monsters done by the current Overlord, as the monsters were created with the purpose of having a tool to keep mankind's population below a certain level (the motivation for this is as yet unknown). On the other end of the spectrum, the Fallen God takes the new Overord's philosophy Up To Eleven. She believes in pleasure above all other things, and converts both human women and angels into her followers, causing them to desire the ultimate "reward" of being locked in eternal coitus with their mate in Pandemonium.
    • The cyclopes were once deities, but some fellow deities cursed them into monsterdom simply because they had only one eye.
    • Translations of the official background material have also shown that Poseidon (who is a goddess in this setting) turned against the other gods and sided with the Overlord in part at least because the other gods were forcing her to make storms to reduce human populations and make them fear the sea.
    • In more detail, monsters were living creatures the Chief Deity created so that the population of humans could be easily controlled. The previous Overlords? They were control devices so that the gods could control the monsters. Whenever the population of humans got too high, the monsters would become incredibly vicious and begin killing large numbers of humans. Then when humans started to die out and the monsters became too numerous, the Chief Deity would grant a human incredible power, creating a “hero”, and send them to slay the Overlord. With the Overlord slain, the monsters would kill each other to decide the next Overlord, causing a rapid decrease in the monster population. This would go on until humans again became too prosperous, by which time a new Overlord would have ascended to take control of the Monsters. This process ran for an unknown number of cycles until a Succubus managed to become the current Overlord, and started messing with the system.
    • A god of unknown identity (perhaps a previous Chief Deity) created the apophis as perhaps the first Overlord, and set them against the ancient desert kingdoms (at the time a flourishing beacon of human progress whose rulers carried the power of an ancient sun god), destroying them utterly.
  • Kimono Fanservice: The Yuki-Onna and Inari look great in their kimonos, but the Jorou-gumo and Youko look drop-dead sexy.
    • The Shirohebi, Ryu and Kejourou look lovely in theirs too. The Nureonago as well, in a way.
  • Knight in Shining Armor: Black Knight: Dullahans wear black armor, but morally they split the difference. To date, they're the only monsters that as an entire race have been stated to fight out of direct loyalty to the Overlord rather than a chance to grab a husband and retire from the front lines or retire completely, demonstrating a knightly alignment. Morally... well, let's not get into that.
  • Knight Templar: The Order. Due to believing the Chief Deity's teachings that the monsters are enemies of humankind, an unnatural part of the world, and that the monster's female forms are meant only to trick humans, they make it their business to kill monsters and launch invasions into the Monster Realms and allied areas. They make no effort to spare the human "husbands" in the process, even if they were unwilling, to prevent them from spreading The Corruption, and some sects actually perpetuate the myth that monsters eat the humans that they kidnap so that people won't sympathize with them. On the other hand, it's mentioned that the clergy itself and most followers act more like a Saintly Church, and a special note is made that they aren't the great evil that monsters and monster sympathizers sometimes think they are.
  • Kuudere: Mantis. She acts like The Stoic her entire life, until she gets her first man during their Mating Season. After her first time, she'll be as dedicated to loving her husband as she is to hunting for food, though her affection outside of sex remains subtle.
    • Sahuagin counts too. She never shows any emotion and rarely speaks, but is loving and vocal during intercourse.
    • Kunoichi are as well, as a part of their Ninja-Education.
  • Little Miss Badass: Half of the Sabbat cult (the other half are their Lolicon husbands). To start, their leader is the Baphomet demon general, all girls - both monsters and humans - are converted into lolis upon joining the cult, with humans being given magic power and becoming witches. The settings information even notes that the cult is actually the magic caster unit of the Overlord's army.
  • Living Aphrodisiac: All monsters are this to some degree. In fact, of the monsters that don't attack men by themselves, you can be sure they'll manage to make you so horny you'll attack them. Species that otherwise can pass as human (like dhampirs and kitsune-tsuki) can even have their true nature recognized by their husbands simply due to how incredibly good sex with them feels. Be it the charm effects of their mana, their bodily scent, physical mannerisms or even the taste of their skin when licked or sucked on, a monster's body is built to arouse and both give and experience sexual pleasure.
  • Living Toy: The Living Doll.
  • Load-Bearing Boss: The Overlord is one in a metaphysical sense. Should some hero manage to kill her, the old world design of the Chief Deity will come back in full swing. Meaning that all monsters will revert back to their former monstrous state, and be forced to start killing humans again - most likely starting with their beloved husbands. At a lesser degree, Lilim could also harbor this trope. Should any of them have enough power, she could become the Overlord's successor and maintain the state of the world even if the Overlord were slain.
  • Love Freak: Lilim, just like their mother, want nothing more than to have humanity and monster girls coexist in harmony with love... expressed through sex. On the personal level, each Lilim is looking for one true lover to be her husband, despite having power to dominate as many men as she wants.
  • Love Is in the Air: The Alraune and many other monsters use pheromones to attract men.
  • Love Redeems,Love Makes You Evil: The Overlord's husband is either of these, depending on who you're asking. He was made the most powerful human by the Chief Deity and tasked with killing the new Overlord, who had defied the Chief Deity by turning the monsters into monster girls and removing their desire to kill and eat humans. However, he sympathized with the new Overlord and they joined forces to make the world as it is now. They even fought the Chief Deity together when she (the current Chief Deity is female) appeared to slay them both for betraying her, won, and wounded the Chief so badly that she was forced to retreat and nurse her wounds.
  • Loveable Sex Maniac: The Merrows are the most lustful member of the Mermaid family, and they never cease thinking about sex. However, when a Merrow proposes marriage to her husband-to-be, she gives him her hat. Said hat is the Merrow's Power Source and she can't even swim without it (unless she gets essence from her husband). In other words, she puts her life in your hands when she asks for marriage. Furthermore, they are generally popular among other mamono, often trading away their lifespan-lengthening blood in exchange for dirty stories.
    • Another example is the March Hare. They are very friendly, but as a manifestation of their madness, no matter what men say to them, they will always interpret it in a lewd manner.
  • Mad Hatter: There is a species of monster based on this character, their origin being matangos altered by the Queen of Hearts. They are quite intelligent and love to speak in intellectual ways, but like the rest of Wonderland they are quite mad.
  • Mad Scientist:
    • The Sabbat didn't abandon their original purpose as the magic R&D unit. Some of their inventions include a technique to engrave Pleasure Runes on clothes and yet still remain effective, a medicine that temporarily turns a man into Naughty Tentacles and another medicine that will temporarily multiply a man into a group of sense-sharing clones (with decreased rationality according to how many clones are made) .
    • Liches are undead who ceaselessly seek knowledge, mostly sexual knowledge, and devote themselves to lewd and magical experimentation. They even remove their own soul and place it in a phylactery in order to be able to focus on recording their experiments rather than lose themselves to the pleasure they experience during such experiments.
    • Subverted with dark mages. Like liches, they do study to advance their magical skills, but they have no particular scientific goal in this, focused instead on enhancing their own pleasure and that of their husband.
  • Magical Girl: Turns out to be a class of heroine in this world, as Fallen Maidens features a magical girl named Mimiru Miltie. Possibly a Shout Out to a certain magical girl series, her fallen state being a Witch, one that is much darker in appearance than the one present in the Witch profile.
  • Magic Contract Romance: Some monsters use this sort of scenario as a way to get a husband, including:
    • The four great monstrous elementals make covenants with human men they like, and given said magical covenant is sealed and recharged with sex the man also in effect becomes their husband. Non monstrous elementals also make covenants, in part due to their curiosity about and desire for human romance, the relationship inevitably becomes romantic if they are monsterized.
    • Demons make unbreakable magical contracts called "pacts" with humans as a cultural legacy of the former age where they used such contracts to destroy or ruin human lives. In the current age the contracts are in effect marriage compacts with mutual benefits.
    • It's possible for magic users to make sapient beings their familiar. To monsters, when this is done between sapient and sexually compatible beings, it's considered a marriage.
  • Magic Is a Monster Magnet: Magic is derived from mana -- the more mana you have, the more powerful a magic-user that you are (assuming you have the skill and mental capacity to make use of the mana in such a way, that is). Monster-girls all can feed on the type of mana humans produce, and for many it is their primary diet, and so are drawn to powerful sources of it. The consequences of this is that magic-using humans find themselves very desirable to at least some varieties of monster-girls.
  • Magic Music: The Gandharva's music pacifies and arouses anyone who listens to it.
  • Mars Needs Women: Inverted. The monsters need human males to reproduce with to remain in existence. One end goal of uniting humans and monsters is to likewise make men dependant on monsters to remain in existence.
  • Mating Dance:
    • The Apsara's dance causes arousal into everybody who watches it. Either towards their own spouse or towards the Apsara herself.
    • Cancers (crab monster girls) have a courtship dance they do for men they like, an irresistible spectacle of rhythmic movements and bubbles full of mana swirling about them.
  • Meganekko: The Blue Oni sports a very nice pair of glasses, and they're also calmer and gentler than their red counterparts... as long as they're sober.
  • Meido: The Kikimora are this. Dressed like maids, they very diligently do every household chore (and anything else) to make their husbands happy. They also encourage their master in all sorts of ways (including sexually of course) to become the best, most productive member of society that he can be. For this reason (as well as their past in the former era when they killed lazy men) some of them are actually attracted to lazy, unmotivated men, desiring to help them become better people.
  • Mermaid Problem: Averted, for obvious reasons. If you look hard, each mermaid-type monster has a indentation just below their waist, where the fish tail joins with girl body, and within this is a human-like vagina. Normally the actual vagina cannot be seen as the mermaid uses magic to conceal it with scales, but they can uncover it at will. The book's bonus art for the mermaid shows her genitals directly as well.
    • Among fans, the problem remained for quite a while with the Centaur and it's subraces. No one knew for sure for some time which side of the body their genitals were on, they might even have had two, one on their horse side and another on their human side (as every centaur Kenkou illustrated had some kind of covering there). When the centaur's book profile was translated it was finally settled that they indeed do have two, the second having been developed when the centaurs became monster girls (Kenkou has stated it came about out of the centaur's desire to have the option to hold their lover close while having sex)
  • Miko: The profession of the Shirohebi lamia-type MG. They are shrine maidens in the service of "Ryus", water-aligned dragon monsters that are treated as gods by the native peoples.
  • Mind Rape: The aptly named Mindflayer consume human minds, though rather than destroying them it is more like they modify them to suit their preferences. Just what they actually do when feeding is rather mysterious, much as the mindflayers themselves are, but the pleasure of it is such that their targets inevitably come back for more and women eventually become mindflayers themselves.
  • Mix-and-Match Critters: A number of monster races can qualify as this, but the chimaera is perhaps the best example. Typically made up of aspects of goat, dragon, lion and serpent monsters (though there can be other mixes with more or fewer or different monsters), the chimaera is able to use the powers and abilities of every type of monster that makes up her body, albeit with the mitigation that each individual power is somewhat weaker than that used by the original monster race. She also will have a split personality consisting of the usual personalities of each of the monster types her body consist of, and each personality will demand attention and satisfaction from her husband. Her body can even change some aspects of itself depending on which personality is currently in control, becoming softer or firmer for instance.
  • Moe Anthropomorphism: Enforced in-universe, and somewhat weaponized, by the Overlord’s power. Originally, most monsters were the usual gruesome run-of-the mill man-eating monstrosities you find in most RPGs. Their transformation into pretty girls was a vital part of the Overlord’s plan to merge monsters and humans into a single species and enforce peace. It also granted these formerly animalistic races sapience and the capacity for human emotion.
  • Mon: The RPG that may or may not ever be made is based on this concept. In other words, it's a harem building game.
  • Monster Lord: The Overlord (also translated as Mamono Lord or Demon Lord).
  • Moral Myopia: Both the Overlord and the Order are convinced of their own righteousness and that the other side is a force of evil (though the monsters are quite willing to recruit, forgive and marry all but the worst people even in the Order).
    • The Overlord's side is that the Order are a bunch of self-righteous puritans ruining her efforts to bring an end to a pointless war that the Gods created and forced upon both sides, as well as interfering with her efforts to gather enough power to improve the faults in her program, spreading blatant lies about her cause and murdering innocents who just happen to have found genuine love or simply sympathize with her cause.
    • The Order's side is that the Demon Lord has functionally destroyed two humanoid races, one of which (dwarves) was already on friendly terms with humanity (dwarves have been almost entirely transformed into toddler-like girls, non-monster girl elves are in decline), is determined to rip human culture as it has always been apart, is threatening humanity with extinction due to the "monster girls only birth monster girls" fact, is cheapening love with her minions' abundance of mind-ensnaring magic and powerful natural aphrodisiacs, and her efforts to paint smilies on everyone's soul are basically an attack on free will itself even when they don't involve turning someone into a parody of their former self.
      • To some extent or other, both sides are right.
      • It should be noted the argument regarding dwarves doesn't hold water, as Kenkou has confirmed that once monsters can birth males, male dwarves will be born to monsterized dwarves (as dwarves are considered a type of human). The same applies to elves. Of course, it may be the Order does not know this.
  • Mother of a Thousand Young: Echidna are a mild case of this trope. Her first-born is always another Echidna, but every child afterward is random, it could even be a whole new species. But like other monsters, especially powerful ones, it's not exactly easy for them to get pregnant.
  • Ms. Fanservice: All monsters are this to some extent or another, or in one way or another. Many prefer revealing clothes or going naked, will actively or involuntarily try to seduce and/or rape human men, and some of them are fine with women as well.
    • Shameless Fanservice Girl: Monsters don't have many nudity taboos on what is considered tasteful clothing, some are aware of human taboos regarding this but aren't likely to care. Surprisingly enough most succubi draw the line on clothing that directly shows their vagina or nipples (at least in public), having their own particular sensibilities in what makes the most effective alluring clothing.
    • Innocent Fanservice Girl: Some childlike monsters like the Alice, emitting charm spells on people around them without being aware of it.
  • Mummy: Was there any doubt?
  • My Girl Is Not a Slut: Monster girls come in 2 types based on number of sexual partners: Type 1, those who surrender their virginity to their One True Pairing and remain monogamously faithful for the rest of their life; Type 2, those who have nothing but casual sex until they find their OTP and then they become just like Type 1. Some like Queen Slimes seemed to avert this but they turned out to be mistranslations. Further, normally, Monster Girls NEVER engage in adultery (a married monster cannot even feel pleasure from a man other than her chosen husband), though some form a harem to a single husband if they all love him.
    • In more detail, Word of God has expressly declared that the possibility of any adultery by a monster girl with any male other than their spouse is absolutely zero, and any seemingly extra-marital sexual intercourse by the monster girl with another female (who can only ever be a single bachelorette herself) never really counts as it is always just merely the means to the end of acquiring another sister-wife to add to the harem, for the mutual satisfaction of both the monstergirl and her husband.
  • Naughty Nuns: The Dark Priestess is a Horny Devil whose whole shtick is that she preaches a "religion" proclaiming the holiness of having lots of sex and runs around in a fetishistic nun outfit. The Angel and Dark Angel kind of fit as well, given they are celestial beings who, particularly in the latter case, now live to have sex. There's also the Sea Bishop, a Mermaid-variant who has the fetishistic clerical uniform, but who is a loving, gentle and shy woman who performs the marriage ceremonies between humans and sea-dwelling monster-girls... which happen to involve the newlyweds having sex right there and then in front of the Sea Bishop (the act is combined with the sea bishop's magic to enable the man to live underwater), who secretly takes notes for when she finds herself a boyfriend...
    • The Roper specimen shown in the profile wears "ordinary" nun's clothing.
  • Naughty Tentacles:
    • The Scylla, being an octopus-based monster girl, has these-though they more often use their tentacles for binding and stimulating their mates than for actual penetrative sex.
    • The Roper is (are?) this combined with The Virus. They bind and rape human men, use their semen to create seeds, and plant those seeds on a human female, causing her to transform into another roper.
    • The Sabbat invented a "Tentacle Potion" which temporarily transforms men into near-mindless masses of tentacles. Often, they'll take these tentacles and use them as clothing until the effects wear off. The tentacle potion is also used to help a monster girl become pregnant faster or more easily as the tentacles produce a lot more sperm than the man normally can. Presumably this is useful because the monster girls bodies consume sperm and semen and thus getting enough inside them to actually have any left over to become pregnant is one part of what makes getting pregnant difficult for them.
    • Dark Matter does this as well, similar to the Roper.
    • The Monster Realm has locations known as the Forests of Tentacles. They are, predictably enough, a forest made out of Naughty Tentacles. Succubi and other monsters often bring their husbands to the outskirts to use them as marital aids, though they are wary of going deep into the forest where the trees are more aggressive. A human woman who wanders inside will be raped until she's either turned into a Roper by the forest or a Succubus by the Monster Realm's natural energy, and she'll probably want to come back routinely even after she's released.
    • And now there's a monster simply called "Tentacle" who came about from an intelligent type of tentacle plant called a tentacle brain. These plants desired to become monster girls, and the desire became enough to transform them.
    • Some monsters can give humans this. The mates of Mindflayers, Night Gaunts and Atlach-Nachas gain the ability to transform into a squid, demon-like creature and a giant spider respectively. The squid needs little explanation while the demon-like creature has many wriggling tentacles and the giant spider has a 'reproductive pouch' above their head that is a mass of wriggling tentacles.
  • Nightmare Fuel: Invoked; the Nightmare monster can invade people's dreams this way.
  • Ninja Maid: The Kunoichi are this to their husbands.
  • Non-Mammal Mammaries: Justified. Even if a monster doesn't nurse their young, being well-endowed is helpful in attracting mates.
  • Not Hyperbole: Inverted, the author himself has said that, as opposed to what is written in some pages, monster girls do not desire sex 24/7 and do plenty of other things in their free time. They do, however, see sex as at minimum having an equal priority to eating.
  • Obake: Many entries, including Oni, Kappa, two kinds of fox-girls, Jorougumo and Yuki-onna. They are pretty much exclusive to a section of the world known as Zipangu.
  • One-Gender Race: Every single monster race of the current era is all-female, although repeated sex with succubi family monsters (which includes vampires and dark angels) can turn a man into an incubus (which while filling the role of males for monsters are considered to be a enhanced human man with a monster girl's lifespan and capacity for sex), sometimes even in just one session. In reality, all the monsters transform men into incubi, but it takes much longer for most non-succubus races.
    • They weren't always one gender either (with the exception of races like succubi, harpies, lamia and such), but the current Overlord has put the world in its current state as part of her master plan. By her setting's definition, all monsters are female and all humans are male.
    • There are in the current age also various monstrous animals that in a sense avert this as they consist of both genders. Found mainly in Umbral Monster Realms, they are typically giant and monstrous versions of regular animals and often considered as monsters themselves by unlearned humans in the setting. However, because they do not produce monster mana (though they are affected by it) they are not considered monsters.
  • One-Winged Angel: Dragons and their subspecies are so powerful that they can transform into their old monstrous form at will. Though some of them dislike doing it for various reasons (not wanting to scare people, or the form not allowing for sex with humans).
  • Oral Fixation Fixation: Ghouls. Full stop.
  • Our Monsters Are Different: Well, they're all female. And horny - all the time, in fact.
    • Some of the beastman monsters have heat cycles and a few are better able to control themselves.
      • Well, there's enough monsters that want to rape men, to make sure men never leave the house. Unless you have a monster mate already, as it is stated most monsters will not attack a man who has been claimed by another monster (they can tell by sensing her energy and scent on the man).
    • All Trolls Are Different: They are gentle and intelligent in nature, look a lot like humans except for the tail, pointy ears and large hands & feet as well as flowers growing on their bodies. They have a strong affinity with nature and can cause plants to grow in even hostile environments.
    • Our Angels Are Different: If an already-corrupted Angel has too much sex, she can fall and become a Dark Angel. Also found in other flavors like the Valkyrie, the Houri and the Cupid.
    • Our Centaurs Are Different: There are normal centaurs, but then there are also the dream-invading Nightmares, the virgin-until-marriage Unicorns, the harem-seeking Bicorns, and the deer-derived White Horns. They're all incredibly lustful of course, though the vanilla-flavor ones at least try to restrain themselves unless something arouses them (though said something can, in extreme cases, be as little as a casual touch from a man), and the Unicorns thrive on Virgin Power, both theirs and their husbands'. Also, all centaur-type monsters have a second vagina in the front at the boundary of the human upper body and the horse lower body (according to Word of God, this is so they can remain face-to-face with their lovers while having sex).
    • Our Dwarves Are Actually Kinda Different For A Change: Dwarf females are toddler-sized little girls who're so good with their hands, the simplest touch makes men fall for them. The men are the same good ol' short, bearded, heavy drinking, jolly guys common in most RPG settings, though they're extremely rare now. When female dwarves began turning into succubi, most of them were very pleased about their brides becoming the kind of lustful woman they preferred to have while drinking after a day of work. Those who had wives that still hadn't become succubi actually wanted them to change, and sought to change their wives. Because of this the corruption spread like wildfire through the dwarven population. The male dwarves, and pure dwarves overall, are now on the precipice of extinction, with all new dwarves born female, beardless succubi. That said, male dwarves will be born to female dwarves as dwarven incubi once monsters become able to birth males (because in this setting male dwarves count as a type of human).
    • Our Demons Are Different: They all want to bed you (if you're male) or convert you (if you're female). If you're lucky, some may ignore you if you leave them be. Also, succubi make up the majority of the demon population now, so don't expect something like Diablo to pop up any time soon.
      • In-universe, "Demon" refers to a succubus subspecies with blue skin and black sclera who snare husbands by making men sign a contract.
    • Our Dragons Are Different: Extremely intelligent creatures, but are slaves to their instincts, which have been warped. Their snobbish aloofness is an attempt to hide their instinctual attraction towards human men (as they recognize human men are now the equivalent of males of their own species). They are now largely incapable of harming humans (save for in self-defense) thanks to the influence of the Overlord. Like any other dragons, they love to collect troves of treasure, and once they find a man who they eventually grow to love, they treat him as the prize piece of their treasure haul. If at some point this man proves himself stronger than her (a rare event as dragons value fighting ability and few humans can rival them), she'll become an incredibly subservient "Lizard Woman," though only to her husband. Also, they're the only monster girl known to be able to resume their original, true monstrous forms, though only for a temporary period of time.
      • They also have various subraces: the Ryu, Wyvern, Wurm, Jabberwock and Otohime. While they keep the Dragon's power to transform into their primal states, their appearance, abilities and behaviors are different in many ways.
    • Our Elves Are Better: And this (specifically their highly magical nature) is what grants the Succubus-infected ones the Heroic Willpower to (temporarily) keep from mating with "inferior" humans, as well as preventing them from gaining monstrous features like wings or horns. Even after becoming succubi they look down on and dislike other monster girls, paranoid that they will try to steal their men, and they still especially dislike dwarves. They also still prefer to live in natural surroundings rather than cities.
    • Our Fairies Are Different: They're tiny, playful, treat-loving and very energetic girls that are normally born from special flowers and weren't originally monsters, though monsterized Fairies do reproduce conventionally. Like elves, their highly magical nature (indeed, a large portion of their physical body is actually made out of mana) means their basic looks do not change with monsterization.
      • Also has two other subspecies: The Leanan Sidhe, who love and are fueled by great art, and the Titania, which are human-sized and the queens of the numerous Fairiy Kingdoms.
    • Our Ghosts Are Different: Being spirits fused with monster mana, they are all lustful, no matter how they were in life. At first, they can't interact with the world physically and will possess humans. The victim will get his or her mind filled with obscene "Wild Ideas" (i.e. erotic fantasies) from the ghost, while the ghost will get essence by absorbing it from a male host until it's enough to manifest herself in physical world. By this time, a host will have been so filled up with 'Wild Ideas' from the ghost, that she will get to engage in sex directly immediately. In the case of a female host, she would likely be so overcome by the ghost's "Wild Ideas", that she'd become as much of a rapist as any monster girl, with the Ghost absorbing essence through the possessed woman's victims until she had enough to materialize and do the deed herself. Especially powerful/well-fed ghosts can become a higher-rank type of undead called a Phantom, and gain the power to extend their illusions/fantasies to their surroundings and thus play out complex and large-scale erotic scenarios.
    • Our Mermaids Are Different: Their blood can extend human lifespans, as in Japanese fables, though most apparently read lots of over-romantic stories about mermaids marrying human princes. There are various sub-races that vary a lot from the typical mermaids as well, including the devout sea bishops (who perform a vital role in sea monster culture via the marriage ceremonies they can perform to enable men to live underwater) and the fierce but well-meaning mersharks.
    • Our Orcs Are Different: They're chubby, pink-skinned women with pig ears on the top of the heads and literal pigtails (as in curly little stringy tails jutting from their rear), as well as being sadomasochists to whom, quite literally, Rape Is Love.
    • Our Vampires Are Different: Not as much as you'd think, strangely enough. The vampires of the MGE are of the classic, regal, powerful, blood-drinking variety (the classic cowl and cape they seem to wear actually being their shape-shifted wings). They do feel pleasure from feeding, as does their prey, but they consider going as far as having sex with a human to be beneath them. However, the men they capture to act as servants and food sources are actually also husband candidates. A man will become an incubus if they're fed from enough, at which point the Vampire warms up to the idea of making him her husband as she can now see him as no longer so beneath her. In some cases, she may even become like a doting housewife around him. While there is no mention of holy symbols, they are weak against sunlight and garlic. Being exposed to sunlight makes them become weaker than the average female human, while the simple smell of garlic makes them drunk - actually eating it will make them go wild like other succubi. If they have sex with a man before he becomes an incubus, and get pregnant from it, the child born will be a dhampir, a type of monster that has some of the vampire's strengths but none of their weaknesses (aside from the craving for blood). Dhampirs also lack the vampire's innate pride and are honest with their feelings. They tend to oppose and "defeat" vampires who do not admit to how much they love their husbands, using their vampire-subduing powers to get the vampire to be more honest (and sometimes making themselves second wives to the vampire's husband).
    • Our Werewolves Are Different: They run around in packs and gang-rape any man they find. Unless you defeat the one trying to screw you, one way or another, at which point she'll become loyal to you.
    • Our Zombies Are Different: They feed on essence - by having sex with men - instead of brains, and are all female but too dumb to distinguish between genders. Some may spend whole nights violating girls in futile attempts to get enough essence. Those that are well-fed, however, will over time regain their former intelligence and become more beautiful than they were in life. They even become able to reproduce, giving birth to the same type of undead as themselves (fueling in-universe speculation that undead are another form of life rather than simply animated dead). Especially powerful/well fed zombies can even become a higher rank type of undead known as a Wight.
  • Overly Long Tongue: The Akaname. She uses it to lick dirt off of her husband. The mucus toad has a similarly lengthy tongue. Lamias have longer than normal tongues, though far less extreme. Succubi are also noted in the Succubus Notebook to have longer tongues compared to humans.
  • Pandaing to the Audience: The Ren Xiongmao. Translated from Chinese, the name means Human Panda or Werepanda.
  • Parental Incest: Dark Elves do not hate humans, but do treat them as sex slaves to be dominated. They then teach their methods to their daughters by practicing the methods on their mother's slave... who is of course their father, and in some cases they will fall in love with their father and make him her husband instead of journeying to find a man. The Devil Bugs, being Roachgirls, will also indiscriminately have sex with any male, including their fathers (and since they are such homebodies, this is usually what happens). As a culture, no monsters are truly opposed to incest (for them, being with the man you love is more important than blood ties), though for most races it is still a pretty rare occurrence.
  • Person of Mass Destruction:
    • The Wurm, due to her near-unlimited strength and stamina, can easily mow down an entire forest by herself when chasing a man.
    • Krakens are capable of sinking ships just to get at one man, and being rather lackadaisical and eccentric they see nothing wrong with such actions so long as they make sure nobody gets killed. This typically results in a sexual feeding frenzy as monsters rush to claim the rest of the men.
    • Almost any high-tier monster can be this if they want to be, notably powerful ones being easily capable of, for example, destroying a village on their own. Of course, nowadays they do not use such power to kill unless they have to.
  • Pettanko: The Harpy family (with the Gandharva being an exception) are rather flat-chested, presumably because they're bird-girls and so need to be aerodynamic. The Cockatrice is a flightless subrace of the same family, but is a swift runner, so the same principal applies. The Werebat, Honeybee and Beelzebub, three non-Harpy fliers, are also fairly flat, while some water mamono, such as the Sahuagin, follow suit.
    • Goblin definitely counts if they aren't lolicon.
  • Petting Zoo People: As noted elsewhere, a fair number of the monsters are this.
  • Pity the Kidnapper:
    • Whoever looks into the jar that a Jinn of the Jar's hiding in will get sucked inside and affected by charm magic. Since the very timid Jinn has no control over this ability, sometimes she will get raped by the man she pulled in.
    • Some monsters let themselves get caught by people who want to sell monsters as slaves, only to use their charms to make sure the man who buys them is one they want and that he ends up taking care of them as much as the other way around. The slaver himself will end up seduced by one of his "slaves" as well.
  • Plant Person: Alraune, Liliraune, Dryad, Kesaran Pasaran, Tentacle, Matango, Barometz, Mandragora and Flow Kelp.
  • Playing With Fire: The vanilla Dragon can breathe very destructive fire as Breath Weapon, while the Ignis is a Fire Elemental that can freely create and control flames. Salamanders possess flames on their tails produced by magical energy. These flames can be used as weapons or simply be harmless indicators of her arousal (both sexual and otherwise). The chimaera (assuming she is a typical individual and thus part dragon) can spew fire from both her arms, snake-headed tail and her actual mouth (though the flames are not as powerful as a real dragon's).
    • An interesting subversion with the Shirohebi. If her partner cheats on her (or secretly meets with other women), she'll actually solidify her raging jealousy into the form of burning blue flames of magical energy, which she then forces into the body of her lover. Following this the man burns with sexual desire, unable to be satisfied by any other woman but her. The flames inside him never completely leave, so he has to keep returning to her. She becomes "the water he must soak in."
  • Porn With Plot: Though nothing beyond a couple of Light Novels, world guides and a small game has been produced yet, the large amount of background info given with each Compilation Book released hints at a much deeper story than just sex.
  • Pop Quiz: The Sphinx casts a curse on a man that comes across her, then asks him a question. If he answers her question wrong, the curse activates, making the man so horny he'll offer himself up to the sphinx. On the other hand if he answers correctly, the curse will be reflected back on the Sphinx... making her immediately rape him.
  • Prehensile Hair: The Kejourou; in fact, using their hair is an important part of sex for them.
  • Proud Warrior Race Gal: Quite a few, most of them Amazon Brigades, including normal Centaurs, Lizardmen, Jinko, Salamanders, Hinezumi and, naturally, Amazons.
  • Pure Is Not Good: The Alice is the most innocent and naive of all the monster girls; she doesn't even understand what sex is (though if she has enough, she does change to gain a partial understanding, and in Wonderland, a full understanding). She also broadcasts an aura that will eventually Mind Rape a man into a loli-lover, who will proceed to first rape the Alice and then become her loyal partner.
  • Questionable Consent: A big aspect of the setting:
    • The Yuki-Onna will use a blizzard to draw someone to their home. After treating him like a guest, she'll proposition the man, and if he refuses she'll cast a spell to chill his heart so that he longs for the warmth of her touch and can hardly help but have sex with her. If afterward he tries to leave her, she'll create a blizzard to try to force him back.
    • Gyoubu Tanuki will use Sexual Extortion to try to seduce someone.
    • Subtext suggests that undersea monsters have the ability to keep their mates alive while underwater for a certain amount of time. However, that also suggests that men caught by them could either submit to them or try to escape and risk drowning.
  • Rape Is Love: Several monsters, through creative use of pheromones or magic.
    • Orcs in Dere mode. In fact, they have an outright rape fetish, and are fine being the rapist (in Tsun mode) or rapee (in Dere mode).
    • Since all Monsters think Sex Equals Love no matter what, none of them would ever mind being raped by their current or future husband. But they don't seem to understand that humans don't have that same sentiment.
  • Rape Is Ok When It Is Female On Male: If you can't embrace this trope, the whole encyclopedia will be High Octane Nightmare Fuel.
    • Well, aside from the few types that usually or never force themselves on men (Holstaur, Unicorn, Inari and such). The Overlord is also seeking to gain enough power to remove the instinct that causes so many monster girls to assault men (this presumably would not lead to an end of seducing men of course).
    • Its also important to note that per Word of God the term "rape" is not used in a serious nuance, and is more meant to instill the idea of a very attractive and assertive woman pushing you down and having her way with you while you bask in the pleasure.
  • Reality Warper:
    • Both the Overlord and Chief God can alter the setting of the world, although the Chief God simply struggle to keep the old setting rather than change anything.
    • Ares, the God of Fighting, is officially neutral, but in practice quite sympathetic to monsters and thus, it seems, bends reality to make it difficult for deaths to occur when monster and human armies fight each other. This, combined with the monsters' many ways to avoid killing means that deaths in human/monster conflicts are rare.
    • Wonderland is full of spells engraved into the very realm that enable the residents to cause all sorts of effects to occur by taking various, usually lewd, actions.
  • Red Oni, Blue Oni: One of the entries is a Red Oni, who is described as a super-strong party girl who likes to kick back, drink booze and have sex all day. The Blue-Oni is far more intellectual and composed than her Red Cousin...until she sees a guy she likes, then she drinks until she loses all her inhibitions, at which point she's just as bad, if not worse than the Red one.
  • The Red Sonja: The entire Lizard(wo)man race, along with their Salamander cousins.
  • Religion of Evil: The Religion of the Fallen One, supported by Dark Angels, Dark Priests and Dark Valkyries. Not necessarily evil per se, but unlike most other Monster Girls that have a bit of restraint, the Fallen Lord's worshipers indulge in sex to an even more extreme degree, especially in Pandemonium, the Fallen One's realm where Dark Angels and Priests bring their husbands. Time is frozen there, and there is nothing to do but have sex.
  • Refuge in Audacity: Although the mere premise of the Encyclopedia may be this, being raped by a sapient mushroom certainly is.
  • Rescue Romance: The Sea Bishop commonly gets a husband by saving a man on the verge of drowning. They do this by having sex with the man to infuse their bodies with magical power so they can live underwater.
  • Robot Girl: The Automaton, a clockwork gynoid made from lost technology that is said to be highly devoted and capable, but poor at showing her emotions.
  • Sand Worm: Rather special among monsters, their external shell is in the form of the same gigantic, armored worm monster they were in the former era. Inside however, attached to the shell via a fleshy umbilical cord that they can freely change the point of contact with, is a pink-skinned woman who functions as their genitalia as well as their brain and the core of their being. They "eat" men by taking them into their shell to have sex with their womanly core. The room-sized spaces inside their shell thus become their husband's new home, complete with magical light for visibility, fleshy equivalents of furniture, and even dry cavities for storing their husband's belongings. Its important to note that they cannot detach themselves from their shell as it is part of their body, albeit powerful individuals (i.e. ones that have increased their mana stores through sex) can learn to shrink the shell down and reform it so that they end up looking a bit like lamia. They do this in order to travel/go on dates with their husband in towns where the normal size of their shell would prevent them access.
  • Scary Scorpions: The Girtablilu is part of the "Arachne" family, and thus appears as the upper body of a human woman replacing the head on a giant scorpion. A skilled hunter, she's a sadist who compulsively stings a man she takes as her "husband" as a sign of affection. By sheer coincidence, this stinging comes faster and more frequent as she feels more turned on/falls deeper in love, her venom is a combination of paralyzer and aphrodisiac (and greatly boosts semen production), and prolonged exposure to her venom eventually mutates her husband's nerves so that he actually derives as much pleasure from being stung as she derives from stinging him.
  • Serious Business: Surprisingly, despite the MGE being a sexual fantasy, a lot of people can debate quite intensely about the morality of the setting's Overlord and her plan.
  • Sex Equals Love: The entire essence of the Overlord's plan to bring world peace. Therefore it is part of the core instinct of all monsters. To them romantic love and sex are deeply linked, and the proof of love is wanting to only have sex with one man.
  • Sex Slave: Surprisingly not very prevalent. There are, however, the Orcs, the Dark Elves and the Amazonesses. Orcs will challenge a man they like to One-On-One combat; whoever loses becomes the slave in the relationship. Dark Elves treat their husbands as slaves because of their natural pride. Amazons go out on raids to carry men off to their villages, where they will be forced to do all of the housework and mounted in public by their kidnapper whenever she feels horny.
    • The setting's information does clarify, though, that monsters that refer to their man as a slave or as prey are essentially synomizing it with "husband" and a strong love can be seen in how they treat the man despite the terms they use.
  • Sexual Extortion: The Gyoubu Danuki may use this to get a mate.
  • Shout-Out: While a majority of the monster races are based on mythological creatures from ancient stories, a good number are instead inspired by characters or creatures from various famous RPG franchises.
    • The Gazer is clearly based on the Beholder of Dungeons and Dragons, to the extent that when he posted her profile KC actually joked about the name with a last second word swap to avoid copyright issues.
    • A number of the slime races are humanoid versions of various types from the Dragon Quest games. Aside from the basic blue Slime, notable examples include the Queen Slime (referencing the King Slime) and the Parasite Slime/Slime Carrier (referencing the Slime Knight).
    • The Mindflayers are as obvious as can be, the only distinction in the name compared to their Dungeons and Dragons origin being the lack of a space between the two words.
    • The kunoichi's design seems to have been heavily influenced by a ninja from Disgaea.
  • Shy Blue-Haired Girl: Nightmares are extremely shy outside of the dream realm, and have light blue-purple hair.
  • Shrinking Violet: The Doppelganger's true form is that of a shy and timid little girl.
  • Sinister Scythe: Both the Baphomet and the Nightmare are seen with rather elaborate scythes, while the Mantis has a scythe-Like blade attached to each of her wrists.
  • Single-Target Sexuality: No matter how lustful or promiscuous Monsters may be, once a Monster has imprinted upon a man as her husband, he becomes in a sense "the only male in the world that exists", so they'll no longer be interested in sex with anybody else.
    • The Extremist Faction of monsters at first glance avert this, as even when married to men they continue to zealously monsterize women (and sexual relations are one way they can do this). However, for them its not about attraction or sexuality, but rather simply a means to make the Overlord's ideal world come about more quickly and to prevent human suffering.
  • Sirens Are Mermaids: Subversion. Mermaids do love to sing, and men who hear their songs will get charmed. However, there are also actual sirens, a bird-human hybrid just like in Classical Mythology, with similar magical songs. While mermaids just love singing, sirens sing with the intent to get husbands.
  • Sleepwalking: The Dormice are capable of walking around while fully conscious during their sleep.
  • Sleepyhead: The Dormice are almost always sleeping, and when they don't they are always drowsy. However, they are capable of walking around and talking to people while they are asleep.
  • Snake People: The "Lamia family" of mamono, all having the upper body of a woman and the lower body of a giant snake or snake-like creature. Certain races of the Dragon family also look like this at first glance.
  • Snakes Are Sexy: The premise of the Lamia family races. Their love for embracing and enthralling men with their long lower bodies is a recurring theme for them. There is even a human cult that worships them as god-like beings (or outright gods, as they view the highest rank race, the Echidnas, as gods) and hold rituals so they can be monsterized into lamia family monsters themselves, the Lamia family's sensual abilities being a prime point of admiration and worship for the cult.
  • Snow Means Love: Played Straight. There's a Yuki-Onna monster girl, but luckily she prefers to take in and mate with men she leads astray in snowstorms.
  • Spider People: The diverse Arachne family of monsters (though the girtablilu is a scorpion).
  • Stalker with a Crush: The Lizardman entry says if someone defeats her she'll offer herself to be his wife and if the person refuses she'll most likely stalk him until he changes his mind. Given her appearance, this isn't necessarily a truly terrible thing...
    • Likewise the Dullahan which will out and out hunt the man she likes down, to bring him back to the monster realm... and she always finds her quarry.
    • Young Kappas will play with male children around their age, not simply because they enjoy human company, but because they're picking out husbands for the future. Yuki-onna do the same thing when they are young.
    • The lizardman's cousin race, the Salamander, does this in a more blatant way. She'll stalk the man she likes but is not quiet about it, taking every opportunity to shout to the world about how much she loves him and wants to be with him, as they tend to act without thinking things through first.
    • In fact, all monster girls can become this to an extreme extent. That is, once they come to recognize a man as their husband they gain the ability to sense his particular mana and can track him down no matter how far he may try to flee from her.
  • Stop Being Stereotypical: Due to the monsters' predatory instincts, most of them tend to be agressive in aquiring a mate, even if they have to drag him away kicking and screaming. This, of course, makes it very easy for the Order to portray them as evil beasts that eat their human "victims".
  • Stripperific: It's stated that most monsters prefer these kinds of clothes, due to it helping to attract and arouse mates. Even when their 'clothes' are actually retractable fur or scales it still shows a lot of skin and doesn't hide their figure.
  • Super Drowning Skills: An interesting subversion with the Nereid. They'll drag women down under the waves and drown them...only for the victim to be reborn as a new nereid.
  • Super Not-Drowning Skills: All the undersea monsters. Sea Bishop especially for being able to give husbands of such species the ability to breath underwater. The ritual, of course involves sex between the wedded couple.
  • Super Strength: Monster girls are stated to be physically stronger than average humans in general. Red & Blue Oni, Ogres, Goblins (Hobgoblins especially), Vampires and Minotaurs are all to varying degrees explicitly stronger than even most trained humans. The monsters with the greatest physical strength are, surprisingly enough, the loli monsters called baphomets, albeit dragons are not far behind them (noted to be able to make the ground shake with a simple stomp of a foot). Wurms are not as smart as vanilla dragons but just as strong, noted to be able to plow right through forests and huge boulders. Such monsters can only be challenged by the strongest of heroes.
  • Taken for Granite: Medusas use this technique to kidnap desirable men. The Cockatrice also has this power. Luckily, the effects are reversible. Also, Gargoyles turn to stone when the sun rises -- and if they're on top of a man when it happens, he does too.
  • Tanuki: The Gyoubu Danuki. Has large, bulbous pants, and is apparently a Proud Merchant Race. Described as a "Bad Girl".
  • Tenchi Solution: Monster Girls in the MGE are generally monogamous, but in some situations will form a harem for a single husband. He must be able to satisfy them all however. Thankfully a by product of an incubus having sex with multiple monsters is that it boosts his own ability to produce essence even further to compensate.
  • The Owl-Knowing One: The Owl Mage is a nocturnal variant of the Harpy with the traits of Owls. Naturally, they are incredibly intelligent and wise beings.
  • The Slacker: Due to the monsters' hedonistic nature, they tend to be stereotyped by humans as poor workers, however the truth is much more complicated. Many monsters that have jobs do indeed approach work in a rather carefree way, readily taking time off and having irregular hours. However this is not due to laziness so much as differing priorities. Monsters all have longer lifespans than average humans, and thus tend to live unhurried lives, having a different sense of time compared to a human. Further, provided they are married they have little real need for money (since if they need to they and their mate can survive just off each other's energy), and thus only desire to make enough money for them to buy things they like or want. However, if the payment for work is something they greatly value, for a instance a man, then most any monster can work with incredible zeal and capability. Some races on the other hand are very diligent and hard workers by nature, such as giant ants, dwarves, dullahan and cyclopii.
  • The Theme Park Version: In-universe example. The Order's lore claims that "The wicked Overlord who emerged from the darkness is working from the shadows to destroy humanity". Fact is, the Overlord and the monsters were included in the design of the "World" that the Chief Deity created. See Jerkass Gods entry above for detail.
  • Three-way sex: It's mostly 2 girls and a guy, though Sabbath's Doppelganger Medicine can create a girl and 2 guys scenario (although they would prefer many more guys in this case).
    • If it turns out that a Doppelganger's target's beloved woman did actually love him back, then when she sees the Doppelganger borrowing her form, they will be linked through mana, causing the woman to slowly change and eventually become a monster like the Doppelganger. Then they will have sex with their beloved man together.
    • As lustful monsters, elves and dwarves often tend to take a liking to the same man, and it often leads to the usual Elves Versus Dwarves. Except that it won't develop into the kind of fight where they spill each other's blood. Instead, they both snuggle up against the man, pinching him between them while spewing insults at each other.
    • In case of elementals, if the covenanter from when they were a pure elemental was a woman, the monstrous elemental will also change her covenanter into a monster (usually a succubus). After the monstrous elementals change them into succubi, succubi elementalists will use the elemental's power to assault human men, and they'll end up having threesomes all the time together with the elemental.
    • The Liliraune focuses exclusively on this. It's a variant of Alraune with two women inside the flower. If they find a husband, they sandwich him between them.
  • Tomboy: Many Alps don't embrace all aspects of their change and will continue to act like men. Although they won't mind having sex with men, eventually.
    • Tomboy And Girly Girl: Those who welcome their change, however, become even more feminine than actual women and get the bodies to match. It's not always either/or though, with some that embrace femininity retaining a tomboy appearance, and others that retain tomboy behavior still gaining very feminine bodies.
  • Trope Overdosed: As if this page wasn't obvious enough. Each monster embodies at least one trope, and there are plenty of monster girls.
  • Tsundere: Dullahans. Tsun with their head on, Dere with it off.
    • Orcs are Tsun or Dere depending on whether they or their lovers are dominant.
    • Vampires are Tsun, at least until their lovers become an incubi, whereupon they, sometimes, become Dere.
    • Dragons are usually Tsundere, their tender feelings often hidden by their prideful attitudes but still showing through as they treat their husband as their great treasure. In the rare event a Dragon's husband proves to be more powerful than them they will go full Dere.
    • Manticores deeply love their husbands, like any monster, but rarely will speak their true feelings.
  • Thou Shalt Not Kill: A mandate imposed upon the monster races via the Overlord's power, done in order to counter the human-killing mandate the gods instilled in monsters. Since the entire idea behind the monster girls is to achieve peaceful coexistence and oppose the old ways, all monsters find the idea of killing a human to be abhorrent. That said, they will still kill in self defense or the defense of their loved ones, some types doing this more readily than others, but even then using nonlethal means is preferred.
    • There are, however, plenty of monster girl species who have been stated to violently brutalize men they catch, some with weaponry, some with their own eldritch bodies. Luckily, it's stated that, physically at least, the men are not harmed to any appreciable degree by even the more extreme behaviors. Monster mana is stated to even automatically protect the man from the claws and horns of his mate during sex, it being basically a built in reflex to help monsters be with humans safely.
    • Even the notably jealous lamias will not truly harm their husband if he cheats on them, instead coiling tightly and ravishing him so thoroughly that their claim on his love is indisputable.
  • Twin Threesome Fantasy: Doppelgangers might make it happen. Also pretty much the fetish the Liliraune caters to.
  • The Undead: The Zombie, Ghoul, Skeleton, Ghost, Will-o-the-Wisp, Wight, Doppelganger, Vampire, Mummy, Dragon Zombie, Jiangshi, Phantom and other entries.
  • Unicorn: They're Centaurs who stay virgins until they marry and only seek virginal husbands too. Not that this makes them less dirty-minded.
  • Unreliable Narrator: Understanding the role this plays in the MGE profiles is essential for fans interpreting the works. The Wandering Scholar (the in-universe author of the profiles) is prone to hyperbole in his descriptions, and also often writes from the perspective of short-term observations and interviews. As such, when it comes to descriptions of daily monster life, Saphirette (another in-universe author) is considered more reliable.
  • Unusual Euphemism: The Kunoichi's "Assassinations" consist of them sneaking into the home of their target, and seducing him with their incredible sexual skills.
  • Unwanted Harem: If a Goblin takes a liking to you, the Goblins will bring you back to their village. And you will have to do it with all of them.
    • This applies to a lot of pack-oriented monsters, actually. Like the Werewolves or Orcs.
    • That said, the sexual skills of monsters and the love they give mean the harem will likely not be unwanted for long.
  • Uplifted Animal: Of the physical as well as mental variety (i.e. gaining a humanoid body and sapient mind). Done in two main ways:
    • 1. Before the current Overlord came to power the majority of monster species lacked the ability to speak, and most also lacked sapient intelligence as well as the capacity for much emotion. While technically not animals, there wasn't much to distinguish them from animals. The current Overlord's ascension and the beginning of the age of monster girls enabled her to change most all these races (with a few odd partial exceptions like the parasite slime) to grant them humanoid bodies and sapient intelligence. While the degree of intelligence still varies greatly, all monsters now have the ability to speak human languages as well as experience human levels of emotion.
    • 2. One consequence of the way monster mana works is that it is heavily influenced by emotion, especially feelings of love toward a human. As such, while normally an animal would never become a monster girl no matter how much monster mana they are exposed to, if that animal loved a human man enough then the mana could cause them to change into a humanoid form (gaining sapient intelligence and the ability to speak) and become monster girls in order to love the man sexually and live with him as a wife. Dogs and cats are the usual examples of this, giving rise to the cu sith and cait sith races. They are easily distinguished physically from normal dog and cat monster girls by how they tend to be covered more fully in fur, have longer snouts, etc. They essentially look similar to the usual version of a Furry.
  • Valkyrie: They are warrior-angels serving the Chief God. Just like regular Angels, they have a corrupted version named "Dark Valkyrie" who, despite being technically followers of the Fallen God, are only loyal to their husbands. Unlike regular angels though, valkyries can be corrupted into monsters and not go into a "dark" form, depending on the circumstances of their transformation they can remain as pure-looking valkyries, continuing their heroics but now following their and their chosen hero's own concepts of justice rather than obeying the gods alone.
  • Violently Protective Girlfriend: While it's said that Monsters hate killing or hurting anyone, they'll become very dangerous and ferocious if their loved ones are in danger. Especially noticable with the ferocious Hellhound, who's fury if someone tries to harm their husband is described as "the sight of hell", it is also notable that is what will happen "even if the enemy isn't killed", implying surviving is the odd outcome rather than the norm and the "sight of hell" is the best case scenario. Black harpies are likewise noted to behave like the monsters of the former age (i.e. human killers) if their family is harmed.
    • To give an idea, a small side story about the early days of the Overlord's rule talks about how a Succubus (implied to be the Overlord) and her husband were attacked by dangerous tentacle plants (they were not monsters technically and thus at first maintained their human-killing behaviors). When the man was slightly injured by them (he repelled their attack but got scratched in the process) the Succubus vaporized all the nearby plants with a huge fire spell and afterwards called in a group of powerful monsters from the Overlord's army who proceeded to level 90% of the forest in half a day. This cowed the tentacle plants to such a degree that a vow to never again harm a human, especially a man, was etched into their very nature. Thankfully for the tentacle plants, they discovered they were able to feed on the monster mana produced by nearby monsters coupling with humans, thus giving them a way to survive peacefully, as well as a role in the new world as sexual helpers.
  • Virgin Power: The Unicorn toys with this. Her magical powers get weaker if she has sex, but only if her lover has had sex with monster-girls other than her.
    • There's also the even weirder/kinkier example of the Alice monster; her Virgin Power drives men to ravish her (and despite her innocence her succubus instincts means she can handle the sex just fine). And when they're done she gets Easy Amnesia and becomes a virgin again (until that is she has an inevitable adventure in Wonderland, the experiences there enabling her to regain her memories of sex, albeit she still retains her innocent, playful personality).
  • The Virus: Many monsters, most notably the Succubus, and always targeting females. Others include the Werewolf, Matango, Roper, and Dark Slime.
    • The Matango has a rare ability to change men; if enough of her spores get inhaled, he turns into a "mushroom person" similar in appearance to the matango but male.
    • If a woman puts on a Mad Hatter's hat, they will become one themselves.
    • And with the introduction of the Lilim, a woman can now be transformed into almost any monster (though some monsters need specific conditions to be met and not any woman can become just any monster). Men also become Incubi when coupled with monsters for long enough, and though they technically aren't monsters themselves, they behave the same and can act as The Virus to human women on behalf of whatever monster species changed them (though there has never been a case of an incubus raping a human woman, their desires being squarely centered on monster girls).
    • Definitely the aptly named Parasite Slime. They're a unique variant of Slime that, instead of taking on human form themselves, enter the body of a human woman, fuse with her, mutate her body internally and change her personality in some ways (though not her basic self). When the fusion is complete, they'll become known as a "Slime Carrier".
  • Voluntary Shapeshifting: Many monsters can disguise themselves as human women, and most all can take on a more humanoid form via the polymorph spell (though if they lack skill they may retain their original skin color and other features). The various Dragon monster girls are standouts, being the only monster girls known that can transform into their original monstrous forms. Nekomata can disguise themselves as ordinary cats. The Doppelgangers take on the form and personality of their husband's ideal woman.
    • On the men's side, Wendigo's, Mindflayers, Atlach-Nacha's and Night Gaunts give their mates the ability to turn into an ape-like creature, a squid, a giant spider and some kind of latex tentacle beast thing respectively. Those men can voluntarily change back but their wives prefer for them to be in their transformed form when in public. This is because they are comfortable with having sex in public when their men are in the transformed form but not when the men are in human form.
  • Weaksauce Weakness: Some mamono have this.
    • The Mimics and Jinns of the Jar become powerless if they are ejected from, respectively, their chests or jars. With the Mimic you just have to shove a key in the keyhole of the chest, and with the Jinn you just have to throw something in their jar or just break it. Such an action also breaks the jar/chest they wear on their body, but as it is a construct made of mana they can reform them once they have a chance to recover their powers.
    • The Werebat is terrified of lights, and will therefore become submissive if exposed to bright lights, but only for as long as she is exposed to them.
    • The Hinezumi becomes calm and timid if her flames are extinguished with water or a man's essence.
    • Giant Slugs become smaller and weaker if salt is poured on them.
    • If the dish on top of a Kappa's head dries up, they will lose their strength.
    • Vampires become nearly powerless when exposed to sunlight.
    • Oomukades are overcome by incapacitating levels of pleasure if they take the saliva of a man into their bodies, but even knowing this they often end up kissing their husband anyway out of love and passion.
  • Well-Intentioned Extremist: The current Overlord, a succubus, had decided to try to fix the ages-long mutually genocidal war between mankind and the monster races. Unfortunately, her method of doing so has caused the world to sink into its current state. While some welcome the change, those that don't aren't necessarily given a choice in the matter.
    • Differently so, the current chief celestial power recognizes that she (the Overlord) hasn't left the world in the best state. Unfortunately, her method of dealing with the problem seems to involve forbidding humanity to make contact with monsterkind, and resorting to kill them at every opportunity. The Chief Deities before her actually used the Mamono Lords as instruments to reduce human populations, though why they did this is not yet known.
  • When Trees Attack: Dryads, Alraune and Liliraune are like this... just replace Attack with Rape.
  • White-Haired Pretty Girl: The Lilim, Dark Angel, Dark Priest, Dark Elf, Shirohebi, Ogre, Yuki-Onna, Yeti, Unicorn, Ghost, Zombie, Skeleton, Holstaur, Arachne, Cockatrice and Ren Xiongmao all have very light hair, varying from white to various color-shades of silver. And while we haven't seen her yet, the Overlord is probably also an example, as Lilim apparently strongly resemble their mother in terms of hair and eye color.
  • World of Buxom: With the exception of child-like monsters and various others, many monsters are well-endowed, with C-cup breasts being small among them.
    • Even humans have the advantage of this. Many of the women whose pre-monsterized forms were shown have large breasts, though slightly behind their monsterized forms.
  • Wu Tai: The Zipangu region, which is the native land of all monsters based on Japanese mythology, as well as humans who fashion themselves after Jidai Geki. The monsters are even referred to as "Youkai" there, as opposed to just "Monsters". They range from being tolerated, to welcomed, to even revered by the humans who live there - and vice versa. They seem to be the third option of the Black and Gray Morality of the setting, but sadly don't seem too interested in the struggle between the Order and the Overlord. Rather they have built up their own forces to keep other powers from interfering in their part of the world (namely having stopped an invasion from an Order-aligned nation in the past). Further information has also shown that while they do not actively serve the Overlord, they are not against her either as it is thanks to her that they have become able to live even closer with humans than they could before, and thus they appreciate and respect her greatly.
  • Yamato Nadeshiko: Nureonago, Yuki-Onna (who even wears a kimono), Shirohebi & Kikimora, among others.
  • You're Drinking Breast Milk: The Holstaur's breast milk is said to be "both delicious and nutritious" and apparently sells well among both humans and monsters.
  • You Gotta Have Blue Hair: Mermaid, Succubus, Sea Slime, Beelzebub, Pixie, Jinn of the Jar, Medusa, Sea Bishop and Nereid.
  • Yandere: Downplayed, as no monster would actually kill others to claim a man, let alone bring harm to their husband. Some do play up certain aspects common to Yanderes, though. The Will-o-the-Wisp is one example. While some monsters involuntarily trap a man (like a Jinn of the Jar), the Will-o-the-Wisp actually imprisons her husband in her cage to the point that not even their soul can escape after death. They're also very jealous and cannot stand it if another couple's happier than her, actively competing to outdo them with their own husband. Oomukades, giant centipede monsters, are noted for rather obsessive displays of affection.
  • Youkai: The monster girls of the Zipangu region. Thanks to various circumstances that allowed their evolution to diverge from the rest of the world, they've had an uneasy coexistence of sorts with humans since even before the current Overlord came to power. Unlike many of the other monsters, youkai aren't part of the Overlord's Army, and, since Zipangu isn't under the influence of the Order, there are no Knight Templar hunting them down (though invasions from anti-monster kingdoms have been attempted and failed, and some of the more fearsome youkai are sometimes hunted or excluded). In fact, powerful youkai like nine-tailed Inari are often revered there as gods. The comparative lack of hostility has allowed many monsters to develop into less ferocious versions of mainland monsters, relying more on seduction and even friendship to gain mates as opposed to outright assault.




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