In 3×3 Eyes, the male demons run the spectrum from ugly to monstrous to wildly grotesque, with only a handful of them (such as Benares, Talisman and D.D.) having overall normal human appearence. Female demons, on the other hand, tend to be more attractive and cute, with only a handful of demonic features, such as Wu Gui (looks like a normal girl with pointy ears and a single horn on her forehead), Kelara (a female demon who looks like a voluptous young girl with two monstrous demonic heads acting as her shoulderpads) or Hamu (looks entirely human, save for her black eyes and pointy ears). The sole exception is the minor demon She Gui, who appears as a monstrous serpent with the horn-covered face of a woman.
Borders on crossing over into the DANGER ZONE but Bagi◊ of Bagi, the Monster of Mighty Nature. Though as the movie progresses she begins to regress towards her half-animal side and eventually loses speech and coherent thought by the end.
In Berserk, the merrow are Always Femalemermaids which have a human upper body and a fishy lower body. They can, however, assume a human shape, and go ashore. In their human form they look almost like humans, but have light blue hair. Some of them have love relationships with humans, and can have common descendants with them.
The half-merrowIsma was born this way. She also qualifies for this trope.
Despite being made of troll intestines at one point, Slan of the God Hand is still pretty hot.
Captain Harlock: Miime of Planet Jura has long purple hair, yellow glowing eyes with no pupils, and no mouth. She is innocent-minded and likes to get drunk (she comes from an alien race where alcohol is a staple food), and to emphasize her feminity, likes to play a harp.
Chainsaw Man's Power is a harsher take on the trope. She might be rather pretty on the outside for a Fiend, but whatever appeal she has is canceled out by her obnoxious, selfish behavior and her refusal to practice basic hygiene. Even when she softens up later, she's more like a bratty little sister than an attractive love interest.
Cross Ange: The male DRAGONs took form of monstrous literal dragons with no other modes. The female DRAGONs can be that too, but exclusively has more humanoid forms, where most of them at least just had foldable draconic wings and tails. The only explanation of this is that they were formerly humans that found a special MacGuffin to let them evolve into dragons and adapt to the new harsh environment brought by various wars, the MacGuffin just had different effect between male and female.
Combattler V: Miia, Garuda's assistant, is a robot girl with pale skin, striped Facial Markings, long blonde hair and two massive, twisted horns on top of her head. She likes to play the harp, and has an obvious crush on Garuda.
Daimos: Princess Erika is an Angelic Alien who's also a Nice Girl and has an Unlimited Wardrobe. Her hair is long and black, and her eyes are blue-green and always have sparkles in them.
DARLING in the FRANXX: Zero Two is a human/klaxosaur hybrid that looks nearly indistinguishable from a human except for her pair of small horns and occasionally red eyes and sharp fangs. She qualified for this trope better when she was a child, since she had red skin, bigger horns and serrated teeth, and still looked adorable despite her feral personality.
Deltora Quest given the fantasy setting and Emily Rodda's characters being re-imagined by Japan, this trope was bound to happen.
The Dread Gnomes are not described as attractive in any conventional sense of the word in the books, but the anime turns female Gnome Gla-Thorn into a cutie.
Fangirls were able to look past Dain's monstrous and demonic appearance (upon his revealing himself a Ol) and still squeal over him. Despite Dain being a heavy case of Evil Makes You Ugly before Lief kills him.
Nezuko from Demon Slayer: Kimetsu no Yaiba counts after coming down with a case of vampirism. Several characters remark that she remains cute despite her claws and fangs.
Demonbane takes this to the logical extreme: we have several examples of Grimoires that take the form of young teenaged girls, rather than books. Apparently this is because these particular Grimoires have so much magic power in them that they have developed a soul, and take a form more appropriate for an ensouled being. Why all of them are female is not addressed, although in the sequel we meet a male half-human, half-grimoire.
Chomesuke from D.Gray-Man has 2 forms, the mostly human (if occasionally black-eyed) form, and her completely demonic form, which is also kind of cute, in a Kingdom Hearts sort of way.
The Wind warriors from Digimon Frontier — when Zoe obtains the Beast Wind spirit, not only does it resemble nothing other than a lingerie model with avian wings and feet, but unlike every other (good) Beast spirit, it doesn't even have the destructive impulses that took other characters up to three episodes to get under control. This is slightly more excusable with the other Wind warriors, as one of them is supposed to be human, another is supposed to be half-human, and the last has no real requirements — but each form distinctly fails in the "Monster" part of "Digital Monster".
Angewomon, LadyDevimon, Lilymon and Rosemon from Digimon Adventure. The Bishoujo Line means most female Digimon are gonna end up like this at some point.
If you want to keep the ‘monster’ in monster girl, you want the villainous Ranamon. Green, covered with seashell-themed, uh, head-things, and cute as a button. Her Beast Spirit form, Calmaramon, is much more monstrous, with a giant squidlike body beneath the humanoid portion. Though it wasn't used that way, you get the feeling the designer had in mind hapless victims approaching a "woman" in the water, and then out comes Cthulhu's little sister to kill you to death.
Dragon Ball Z has the female Saiyans especially Fasha and Gine as unlike the universe 6 fem-Saiyans Caulifla and Kale, Fasha and Gine still have their tails thus qualify. The cave-dwelling female Saiyan with Cutlass Between the Teeth in a flashback to planet Tuffle also deserves a special mention.
Actually male Saiyans might well count for female fans, especially in their ape-like Super Saiyan 4 transformation from GT.
Demon women are nearly all babes in other Dragon Ball media, like the Snake Princess in a filler episode in Z, her maids and especially Towa◊ from Dragon Ball Xenoverse.
Female Buus unlike their male counterparts have voluptuous builds and way cuter than the fat male-Buu, they're so attractive they give the female Saiyans a run for their money and males in game express their attraction towards them. Taino and Titima are definitely stands outs. Justified in that when Buu decided to make a female of his kind, he used a picture of a model as a base.
Dragon Half: Mink, though granted, she's a Half-Human Hybrid herself; her mother is a dragon. Her mother is usually transformed into a humanoid form but tends to break it when she becomes angry especially if the object of her rage is her philandering, lecherous, human husband.
Dropkick on My Devil is rife with them since most are the main characters. We got Jashin, a Lamia, Medusa, a gorgon, Yuki-onna sisters Kori and Yusa and Minotaur girl, Minos.
The Bugrom of El-Hazard: The Magnificent World mostly resembled giant neon cockroaches, with the exception of their queen, who resembled a normal attractive human female with antennae.
Her similarly stitched up sisters Gavrill and Veronica can be pretty damn cute (that is, when they're not being fuckingterrifying) as can officer Kuhou after she was transformed into a monster girl.
Miiru from the second volume of Fushigi Yuugi. She is actually a servant of Tenkou who became such because she and her brother were killed for incest and wanted Tenkou's help to find a place where they could be happy. In the manga, her shadow is shown as a demon.
Neko Musume in GeGeGe no Kitarō was originally an aversion, but every animated installment builds her up to this trope. By the 90s, her feline features became limited to eyes and a few fangs, and by 2007 she was firmly on the "cute" side. Her 2018 incarnation takes the cake though; when she's not using her powers, she looks the most human and mature she's ever been, with only her sharp eyes indicating she's inhuman.
Stella is an alien who is naturally gigantic with cross-shaped pupils and a devil tail. Aside from that (and being quite curvy for her age), she looks just like a pretty human girl.
Sumire Kotobuki leans more toward the "monster" end of the spectrum, appearing to be a member of the same rabbit-like alien race as Sebastian and Gimlet. While the aforementioned male characters have had moments of being considered attractive, Sumire is quite a bit taller than them and has an attractively voluptuous figure, as well as a slightly more human-like face while still possessing the animalistic features of the males.
Ghost Sweeper Mikami has main character Okinu, a Cute Ghost Girl, as well as the recurring antagonist Medusa and Ridiculously Human Robot Maria. Not to mention what Mikami herself is revealed as. The series also has a few recurring characters like Aiko, a youkai desk and Shouryuuki, a dragon martial-arts trainer.
Gigantor: Prince Gura◊. He may be the son of a giant demonic alien, but he's rather human looking, with an innocent and childlike demeanor. He has long eyelashes and blue hair that fans out behind his head, though it's sometimes obscured by his Cool Helmet.
In Howl's Moving Castle the titular wizard has a bird transformation where he keeps his handsome face and is just appealingly feathered. Averted when Howl gets out of control or enraged as he becomes monstrous.
The Interspecies Reviewers come from a peaceful fantasy world full of monster-girls, and all sorts of races and species. Their goal is to review what it's like to sleep with as many of these ladies as they can.
The anime Inuyasha also has a lot of them. All female half-demons and very many female demons in human-like figure look very sweet, although we recognize that they are not human.
Also all the male half-demons (except Jinenji) and very many male demons in human-like shape are bishounen.
While Kuroe Akaishi of Kaiju Girl Caramelise is not very cute in her Kaiju form, whenever she does a Partial Transformation, the monstrous parts do nothing to detract from how adorable she is, especially when she's flustered. Even when she is a Notzilla, her beautiful eyes being retained and the heart-shaped part of her wing still manage to be rather charming.
Himemiko from Kamisama Kiss, at least when she is in her human form. Her real form is a catfish demon.
Lapis Re:LiGHTs has IV Klore, a Dark Magical GirlIdol Singer unit composed of Emilia (a succubus), Salsa (a werewolf), α ("Alpha", a MagitekRobot Maid), and Garnet (a Cute Ghost Girl). They mostly resemble humans with some clearly inhuman features or behaviors like Cute Little Fangs, Red Eyes, Take Warning, or partial transparency, and are referred to as "Demi-Humans" in-universe. Salsa and Emilia are hinted at as having more monstrous forms they can shift into, however.
Though the Zentradi from Macross and Robotech are Human Aliens, the males range in appearance from ugly to average to handsome, with the occasional odd skin tone and/or cybernetic aspect, while the female Zentradi are always depicted as beautiful. The Zentradi designs in Do You Remember Love? are probably the strongest examples of this trope.
All of the female dragons in Miss Kobayashi's Dragon Maid apply to a certain degree when they take on human or partially human forms. This isn't a racial trait either. Their human forms are explained as being their essence expressed as if they were born human. Ergo a dragon that is attractive by dragon standards will turn into a human that is attractive by human standards.
Justified in Mononoke Sharing. It's explained near the end of the series that the entire mononoke race is slowly turning more human with every generation and will eventually lose their powers entirely due to the fact that they weren't part of the gods' plan for the Earth. Momi created them to ease her lonliness while she waited several billion years for humanity to evolve.
There is a whole sub-genre for redrawing mecha as girls wearing the machine as armor. It has gone so far as the Destroid Monster! But perhaps the ultimate mecha example is the Valsion's◊ entirely canon sister unit, the Valsione◊. (Apparently the Valsion's operator made the Valsione for his daughter, who gave it a feminine form out of personal preference.)
Almost the entire female cast of Monster Musume, which features a Lamia, a centaur, a harpy, a slime, a mermaid, an arachne, a dullahan, and those are just the main seven. The series also puts much more focus on the monster aspect of the characters, as every chapter tends to explore an interesting aspect of their race beyond their superficial appearance. Suu dissolves in large bodies of water. Miia has trouble shedding her skin when she's stressed. Papi, like all harpies, has a small figure which helps her fly.
Same author as the above two, 12 Beast ups the ante with an entire army of cute monster girls—and boys! Though the majority of the focus is still on the ladies, Eita's army does not lack eye candy for other orientations.
In Monster Rancher is also true, to some monsters. Pixie (later Granity), Lilim and Poison. They look like girls but horns, pointy ears and wings have like a bat. In addition, they are also clothed rather sparse.
Musuko ga Kawaikute Shikataganai Mazoku no Hahaoya: Demons generally look like humans, except with horns, a tail, and wings that extend from their hips. There is some variation to this, as Lizette's wings are on her head, and some, like Helga and Fuuga, don't have wings at all. Also nearly all demons possess the ability to demonify into a "battle mode", which makes them appear more monstrous than cute.
My Monster Secret has a vampire, alien, "wolf-man", and other Cute Monster Girls hiding in plain sight at a high-school, as the principal is one herself. Hilarity Ensues when an Ordinary High-School Student finds out when delivering a love letter.
My Hero Academia features some girls with clearly inhuman features thanks to their Quirks such as Tsuyu Asui (who has frog-like characteristics like large and elongated hands, feet, digits, limberness and a long tongue), Mina Ashido (who looks just like a normal girl except for having bright pink hair and skin, and a pair of horns/antenna in her head) and Himiko Toga (has vampire-like characteristics like sharp teeth and thirst for blood). Tsuyu in particular went on to become a Breakout Character for the series in part to her cute design.
In Naruto while the males of the Sound Four all look hideous when they activate their cursed seals (even Bishōnen dudes like Kimimaro and Sasuke), Tayuya still looks cute◊ regardless.
When tapping into the Kurama (Nine Tails) Chakra or Sage Mode, Naruto can get Fox/Frog like features as result but even then he’s still more attractive compared to Orochimaru and Kabuto when they go all Scaled Up.
Kaguya has horns, pale skin dead eyes and other inhuman attributes. She’s still pretty attractive though.
Gainax's various merchandise for Neon Genesis Evangelion includes the "Apostle XX" line of figurines, which takes several of the Angels and gives them a female humanoid makeover. Technically, Rei and Kaworu might count, though the latter is a Cute Monster Boy instead.
The titular "oddmen" of Oddman 11 have most of its members within variable points of the monster-girl spectrum. For instance, Inuta is a full-on dog furry girl (to the point of having six nipples), Ika-chan has several tentacles and a weird shaped head but otherwise regular female anatomy, while Kirara only has cat ears and a tail and Tatari is a regular girl with a single eye.
The merpeople. The mermen (male) both have the tail of fishes and fish features on their upper bodies such as gills, spines and pointy teeth. The mermaids (female) all have the upper bodies of regular humans and are almost always dead-sexy.
Depending on who you ask Boa Sandersonia is either Gonk or a cute snake lady.
Monet from Punk Hazard is a harpy and easy on the eyes. Until she goes into her monster form thanks to the Snow Snow Fruit, that is.
Charlotte Praline is half mermaid half human and is rather easy on the eyes especially considering her mothers looks.
Giant Women in One Piece e.g Gerth and Lily Enstomach from Filler are incredibly attractive.
Female Minks e.g Wanda and Carrot are more curvaceous and humanoid than the male Minks but can still be dangerous beasts when the time calls for it.
The female SMILE users of Kaido’s crew qualify, e.g Horse Girl Speed, Spider-Monkey girl Solitaire and Sarahebi the snake teacher.
Among the Flying Six there’s Ulti and Black Maria who unlike their male teammates are still quite cute and attractive when transformed into their Pachycephalosaurus and Rosamygale Grauvogeli forms respectively. In Maria's case this is actually a Invoked Trope, as being vain she disliked how ugly her hybrid form looked◊ and took a drug similar to Chopper's Rumble Ball so that only her lower body is spider-like. This becomes a crippling Achilles' Heel when a Combat Pragmatist like Robin targets her upper body in their fight.
Mosquito Girl in One-Punch Man looks human except for her insect-like limbs and wings. Though she is somewhat creepy-looking in the original webcomic, she gets a dose of Adaptational Attractiveness in the manga and anime where she gains a voluptuous build.
Petopeto San is entirely devoted to the concept of cute monster girls (some of which are half human).
Shia, from Pita-Ten, is a demon/demon's apprentice (depending on whether you're reading the manga or watching the anime,) but she looks completely human and is also very, very, very cute. The males in canon all fawn for her and many develop actual feelings for her, as well. Although, another demon is also shown, Klaus, and he's also cute in a shoujo kind of way, himself.
Invoked in Precarious Woman Executive Miss Black General. GG the cockroach girl goes through a bad bout of depression over her feelings of inferiority towards lion man Black Lion. Minion 2 cheers her up by pointing out that while Black Lion is more of an anthropomorphic animal, GG kept her good looks as one of these. Cue blush.
Princess Resurrection has Riza Wildman; granted, she's at least half human, but the other half (and DEFINITELY the side she takes after) is a flesh tearing, vicious werewolf. There's also Reiri and Flande, as well as the main character Hime who's a phoenix in human form, among a few others.
This goes for many of the demon women on the Demon side of the conflict as well, including Rita. Virgin Soul also gives us Nina Drango, who is part of a Demon tribe that can turn into dragons but is just as cute and perky as any other human girl her age.
Maya make friends with an "Alice" (a high-level humanoid monster). This is the impetus for explaining her Dark and Troubled Past.
Jiltus, being a half-human hybrid, is very cute if you like them evil.
Every single girl except for Kyoko (Tsukune's cute but human cousin) in Rosario + Vampire. They spend the most of their time hiding their monster traits, though, so they look completely human except during fights, and when transformed the main gals (and many of the supporting cast) are STILL cute (Moka is devastatingly so, Kurumu becomes ultra exotic, etc.).
Sailor Moon combined this with Progressively Prettier. The Youma and Cardians were, for the most part, fairly monstrous-looking. Droids, Daimons, Lemures and Phages were much more attractive; while there are a few monstrous ones, they were mostly beautiful women with pointed ears and/or oddly colored skin.
Seraph of the End: Krul is a vampire, who's short, pink-haired and dresses in an Elegant Gothic Lolita manner. She has two black horns on the top of her head, and a cute pet bat as well. Even though she's aloof to most people, she's endlessly kind to Mika, her Establishing Character Moment being kissing him to save his life.
The eponymous character of Squid Girl is an adorable squid-girl.
The Seedrians from the third season of Sonic X are like this. The males are monsters that transform into Godzilla-like creatures (and later become Decepticon-like robots, for reasons that aren't thoroughly explained...), but the females are cute plant-girls, and Tails falls in love with one named Cosmo.
Holo from Spice and Wolf is a verycute girl◊ with wolf ears and a big fluffy tail, both of which she keeps hidden under clothing when she wants to pass for human. Her true form is that of a wolf as large as a bus, which is rather less cute.
Niche from Tegami Bachi: Letter Bee, as while her cuteness depends on who you ask, she certainly fills the monster and girl roles. Then there's Niche's sister...
Today's Cerberus gives us humanoid versions of not just Cerberus but also Fenrir, Jormungand, and Orthrus.
TSUKIMICHI -Moonlit Fantasy-: Tomoe/Komoe, Mio, and Shiki start out as an ancient dragon, a giant spider and decrepit lich, only to become highly attractive humans after becoming Makoto's Subordinates. To some extent, Ema and the other female Orcs, who tend to look more like cute pig Funny Animals in dresses and so forth than the more standard monstrous portrayals, also fit the description.
Hazuki from Tsukuyomi: Moon Phase. Anyone unfamiliar with the story and character would NEVER assume she's a monster! The opening theme doesn't help.
Lum looks like a cute teenaged girl with green hair and little horns, but is explained as being an alien whose race is the inspiration for Japanese ogres. Her being such is actually lifted straight from Japanese mythology, where Oni women are supernaturally beautiful, but capable of assuming fearsome visages when angry or jealous.
Lum's friend Oyuki (a yuki-no-onna — although these ghosts are usually portrayed as attractive anyway) and secondary character Kurama (crow tengu — her servants look like anthropomorphic crows, while she's a pretty girl with small crow wings on her head). One might tentatively incorporate Ran (loosely based on the Gaki, a life-draining ghost) and Benten (a punk biker version of the Goddess of Knowledge, Art and Beauty) into this category as well.
Prince Heinel is a BishōnenAlien Prince who dresses exquisitely and has horns. The staff of the show are very aware of the reputation he has amongst fans - this◊ is how he's drawn in Animage.
Katherine Rii, despite being a cruel, noble Boazanian, is very pretty, dresses in a Fairytale Wedding Dress, wears a lot of sparkly jewellery, and dons a veil over her horns. She's the Lady to Prince Heinel's Knight.
Merag, the only female Barian Emperor in Yu-Gi-Oh! ZEXAL is cute in her own unique way likely because she's very beautiful in her human form as Rio Kamishiro.
Comprises over half the main cast of Yuuna and the Haunted Hot Springs. Until Kogarashi moved in Sagiri was the only human at Yuragi-sou.
Tons of them in YuYu Hakusho, especially during the tournament which features a cat-girl announcer and a dragon-girl referee. There are Monster Boys too, (Yoko) Kurama probably being the main one.
Zombie Land Saga is about an idol group composed of cute girls who happen to be zombies.
◊ of Bagi, the Monster of Mighty Nature. Though as the movie progresses she begins to regress towards her half-animal side and eventually loses speech and coherent thought by the end.
