"There's an old saying: Pretty girls turn heads…I break necks!"They are cute, sweet, innocent and extremely huggable. Incidentally they are also varying shades of violent, unstable, and downright insane. Cute and Psycho is a trope that describes characters who are genuinely cute in both appearance and mannerisms but have a completely batshit crazy side. Sometimes there are distinctly different sides which may be shown equally, but other times they are mostly one or the other, the Killer Rabbit displaying moments of sweetness and relative-sanity or The Cutie showing hints of a dark psychotic nature. Often there is some kind of Dark and Troubled Past, or Split Personality to justify how the two aspects of the person can both be genuine, but other times no explanation is revealed. The primary difference between this trope and the Yandere is that the Cute and Psycho character is not driven by an obsessive need to possess a friend or lover. Their motivation, if they have one, can vary immensely. They also don't necessarily have to be provoked to enter their Psycho-state, but can switch for reasons observers would be hard-pressed to determine. Cute and Psycho is a Sister Trope to Killer Rabbit, Creepy Child, Yandere and Enfant Terrible, and closely related to Face of an Angel, Mind of a Demon, Psychopathic Manchild and Beware the Nice Ones, though while there is frequent overlap between these tropes being one doesn't necessarily mean a character qualifies for another. If the "cute" part isn't real, then the character is The Fake Cutie instead. Characters of this type tend to be female, though male examples do exist. The Ophelia is someone whose psychosis is part of the cute picture, rather than contrasted to it. In some anime fandoms this character is referred to as a yangire, an informal fanspeak term which is a portmanteau of yandere and kireru (a word meaning "to snap or lose one's temper"). It's also used to refer to Ax-Crazy versions of The Fake Cutie. Not to be confused with fangire, which is a species of monster vampire.
— Lady Sports on Nikki Storm
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- Ran of Urusei Yatsura is the poster child for (and likely the inspiration for all other) Cute and Psycho characters. On the outside, she's a cute redheaded girl who likes frilly clothing, baking, and flirting with Ataru. In reality, she's an embittered childhood rival of Lum who is out for some very violent revenge on the girl for well, a lot of things that aren't Lum's fault.
- Akame ga Kill! gives us Seryu Ubiquitous, the "Crazy Lunatic". Regularly, she's sweet around those who she doesn't consider evil. Around those that she does, of course... her personality switches over to bat-shit insane. As a matter of fact, she comes complete with a twisted conception of right and wrong.
- Rio Miyaichi from Ana Satsujin. She's a cute, socially awkward college student, but also a psychotic serial murderer who favors slashing her victims necks with a box-cutter.
- Axis Powers Hetalia:
- Russia is a mixture of Cute And Psycho and Yandere. He cracked for non-romantic reasons (the Bloody Sunday), has mood swings due to his childlike temperament and manipulative nature, but his unstable side comes out especially strongly in regards to those he wants to keep close.
- Latvia has the potential to become one, having been abused so much by Russia that he comes close to snapping in the "Lily of the Valley" incident. It's not mentioned later.
- Several in A Certain Magical Index and its spinoff. From the Railgun anime, we have Telestina. From the novels, we have Anyeze, who goes from ditzy, innocent fanservice girl to psychotic religious freak proclaiming Catholics believe that marriage with 'outsiders' is bestiality in the course of a single scene. Which is offscreen.
- Black Butler has Alois Trancy. Throughout the first episode of the second season, he flips from sweet and innocent to Ax-Crazy so many times, it could make someone dizzy. As of his Character Development, he move into Yandere for Claude. That one backfired HORRIBLY.
- Hansel and Gretel, the Creepy Twins from Black Lagoon. They seemed to be cute in a creepy way, they are also a pair of Ax-Crazy Psycho for Hire twins who kill because it turns them on and are absolutely insane. And that's to say nothing about their Dark and Troubled Past.
- Yukio from Bleach is revealed as such in chapter 466, when he gleefully uses his Fullbring against Hitsugaya while explaining how he drove his parents to commit suicide as revenge for their Parental Neglect. And once his rival presses his Berserk Button? The guy went BATSHIT INSANE.
- Diva, the Big Bad of Blood+ often acts like an amusingly spacey example of The Ophelia, but she's pretty horribly evil.
- Bungou Stray Dogs has Q, described by Dazai as "a demented ability user" with no regard for friend or foe who amuses himself by making people hallucinate about their worst insecurities and watching them attack their friends. He's also a cute thirteen-year-old who looks like he's nine, almost constantly has a sweet smile on his face, and carries a doll half his size wherever he goes.
- Code Geass has Euphemia, after she gets accidentally Geassed into becoming a mass murderer. "Those of you who call yourself Japanese, I have a favor to ask. Could you all die, please?" "I was hoping you'd all just commit suicide, but you can't, can you? O.K. So, soldiers, please kill the Japanese. Kill them all." Then she proceeds to grabs a submachine gun and shoot everyone.
- Fear from Cube×Cursed×Curious can become quite creepy when she decides to go fully psycho. It doesn't help that she IS a weapon able to become all kinds of torture devices, and that this is actually her original personality.
- A lot of child Contractors in Darker Than Black come across this way, especially the female ones, who channel a similar idea to Girl with Psycho Weapon. Mai in the first season of the anime, and both Azuza and Bai (in a flashback) in the interquel are shown killing or maiming people horrifically while having a Moe Stare expression on their faces. Maki might also count along with being a yandere. He sometimes comes off as an Adorably Precocious Child, but is completely psychotic and has an obsession with his leader, Amber.
- Kurumi of Date A Live is cute and has a whimsical personality but there's a reason her codename is "Nightmare". She has to hurt or outright kill people to power her Angel, but she's also not above killing them just to amuse herself and at one point tried to kill everyone in Shido's school just to prove a point.
- DEAD Tube brings the lead girl Mashiro Mai, her introduction and following scenes are made to establish her as a cute girl, diligent sports girl for her swimming club, sociable to her girlfriends, cheerful smiler all around; what follows that is she being thrilled about murdering someone in cold blood, and demanding that it be filmed.
- Deadman Wonderland has Shiro, the hyperactive, scatter-brained apparent Manic Pixie Dream Girl who can and will rip off people's heads with her bare hands whilst smiling like a kid who's just left the sweet shop. She's also the 'Red Man', the unstoppable killing machine who slaughtered Ganta's entire class at the start of the story.
- Toto's facial structure, body type, manner of movement, and high voice all call to mind a fairy or something similar, but he's the reigning champion of Carnival Corpse and widely regarded as battle-crazed.
- Death Note:
- Misa Amane is both Cute and Psycho and a Yandere.
- Beyond Birthday from the Another Note spinoff novel. Take L's more Moe qualities and then add crazy-evilness into the mix.
- Light Yagami, especially early in the series before Art Evolution and Character Development. His features do coarsen a bit the older and nastier he becomes.
- If there are types of criminals that Shinichi Kudo from Detective Conan absolutely loathes, it's either this and/or Yanderes. And there's no shortage of those in such a Long Runner of a series.
- Mairu and Kururi from Durarara!!. Since they're Izaya's little sisters, it was obvious, though at least they're kinda sweet until you directly mess with them. Other examples include Erika, Walker and Aoba.
- Nearly every Diclonius in Elfen Lied, with Lucy also qualifying as a Yandere.
- Wrath from Fullmetal Alchemist starts off as naively adorable, but upon being awakened... Yikes.
- Future Diary:
- Tsubaki Kasugano, the Sixth Diary Holder seems at first to be more of mix of Yamato Nadeshiko and Bitch in Sheep's Clothing when dealing with Yukki and Yuno, but then we see that her backstory of orphanhood and sexual slavery drove her completely insane.
- Fifth Diary Reisuke Houjou is a cross between Cute and Psycho and Tyke Bomb.
- Yuno herself, typical of the postergirl for Yandere everywhere. She always has this adorable little smile on her face when she attacks people with axes.
- Henri Claytor from Future GPX Cyber Formula, who appears to be a cute and cheerful rookie racer in ZERO, actually has a homicidal obsession with making Hayato pay for ruining his life. This is due to his father ignoring and abandoning him after Hayato wins the championship instead of him. He somewhat gets better after the end of ZERO.
- Parodied in Galaxy Angel with the Character Exaggeration of Chitose, who already had some belonging issues; when the Angels left her behind or otherwise slighted her without knowing it, she went absolutely crazy with revenge, once even trying to turn them into rice and eat them. (Don't ask.)
- Girls Bravo: Lisa is a rare comedic example, since she's loopy, rather than crazy. While she's threatened to have Kosame cap Yukinari, if he refuses her, she's far more likely to cast a summon spell (provided she gets it right). Or, she'll simply have her servants kidnap Yukinari and bring him to her.
- Four Murasame and Rosamia Badam from Zeta Gundam, both of whom were some of the earliest Cyber-Newtypes and completely insane because of it. Not evil, just frightened and confused girls with a warped sense of reality (it is not coincidence that they pilot something called the Psyco Gundam). Then Gundam ZZ introduces Elpeo Puru and her clones. Puru herself is mostly harmless but is still a Child Soldier with a deep-seated obsession with Judau, while her clones were all mentally conditioned to serve "Master Glemy" and were coldly classified by Zeon as equipment rather than people.
- Mobile Suit Victory Gundam arguably has Katejina Loos, who doesn't look especially bad at first - she's initially rough around the edges, but fundamentally good-natured, until Chronicle gets his mitts on her (and main character Uso even states she's changed since joining Zanscare and used to be nice and kind deep down). To further complicate things, in the novels it's strongly implied she underwent Cyber-Newtype treatments, which are known across the series for making those who undergo them violently unstable.
- Mobile Suit Gundam SEED Destiny has Stella Louisier, one of the Extended members of Phantom Pain, and the series' version of the aforementioned Four. Adorable, childlike, happy... and a supersoldier with mental conditioning and enhanced physical skills from a complex, long-term treatment of drugs (which she can't survive without). She ends up torching half of Europe with a superweapon not out of malice... but because she was scared and had been told that the people there were "bad things" that were going to get her.
- Gundam 00 features Throne Drei's pilot Nena Trinity, a Genki Girl redhead who likes to wink, mock-fight with her violently overprotective brother and fellow Throne Michael and throw up the V-sign. She also gives Setsuna his Sacred First Kiss (also the first kiss for the series), much to his disgust. Exactly one episode later, Nena blows up a civilian wedding while on her way to the next mission to vent her frustration with having a hard day of work while others have fun. When asked by her brothers why she fired on civilians, Nena simply giggled and replied, "Heehee, sorry, I pressed the wrong button." In the second season, she dropped the facade as Liu Mei belittled her, and Liu Mei learns the hard way about double-crossing people when Nena traps her inside her ship as it's exploding, cackling maniacally all the while.
- The title character of Haiyore! Nyarko-san has this naturally, since she claims to be Nyarlathotep, an insane and malicious Elder God from H.P. Lovecraft's Cthulhu Mythos, in the form of a beautiful teenage girl. Normally she's energetic, outgoing, and incredibly friendly with a passion for Anime and Toku. To her enemies, however, she's an Ax-Crazy lunatic with no sense of restraint and a propensity for turning her foes into Chunky Salsa. And if you lay a finger on the guy she loves, well, I hope you've taken out a life insurance policy.
- Ayame from Hanayashiki no Juunintachi. On the outside, she looks like a normal (if tomboyish) girl, but when a pervert tries to have his way with her, she proceeds to mace him with bug spray, rearrange his face with a hammer, stab him with a box cutter, mess him up with scissors... Did we mention it's a shounen romance comedy manga about cooking?
- Ryouko Asakura in Haruhi Suzumiya, who manages to remain Cute while being Psycho. However, the human version of her from Disappearance is your standard yandere.
- Chaos from Heaven's Lost Property is what happens when you mix Ax-Crazy with Love Freak while avoiding Yandere. What you get is the creepiest Moe character in the series who wants to share her "love" with everyone.
- Yukino-sensei in Hohzuki Island, who at one point sneaks around the school in the dark, naked, with a wooden sword, ready to beat one of the children to death. Later turns out to be a subversion—yes, she's snapped and is fucking creepy, but it was because she thought one of the children was Cute and Psycho themselves, due to her best friend and fellow teacher turning up murdered. The kids acting very suspiciously didn't help matters. By the end of the manga, she realizes everything she thought was wrong, clears up some misconceptions about her, and then pulls a Big Damn Heroes on the real murderous teacher.
- I'm Gonna Be an Angel!:
- Mikael is usually a cute, easily agitated boy, but when under great stress and when things don't go they way he wants them, can turn into a really scary and obsessive psycho. It might caused by a side effect of his halo falling off.
- The same can be said about Silksey - very moe and doll-like but tends to smash everything apart and set on fire when enraged. Only she was a scary psycho for most of the time during the series and again it can be argued that it was mostly a side effect of her halo falling off.
- Mama can turn into a very crazy witch when under too much stress.
- Yukako in Jojos Bizarre Adventure part 4. Initially she appeared demure shy and sweet around Koichi before quickly showing her temper and obsession. She also tends to live in her own world, which makes her dangerous.
Mildo: Valmet, you're all I ever think about. How you live. How you fight. How bout we beat the living shit out of each other, then I kill you. Sounds fun, eh? Kinda poetic.
- Mildo, a twisted rival female mercenary introduced in Volume 1, who is seemingly obsessed with defeating H&C Logistics Incorporated's resident Knife Nut in hand-to-hand combat.
Valmet: No... not at all... you psycho!
- In Katanagatari, (Warning, this spoils one of the best reveals of the show)
Nanami: "My little brother kept chewing his nails, no matter how often I told him to stop. One day I ripped out his nails. He never bit his nails again." (The ninja she's torturing starts to sweat and shiver.) "It's only a story about child discipline."
- Big Bad Byakuran from Katekyo Hitman Reborn!, and Daisy and Bluebell of the real Six Funeral Wreaths.
- Nui Harime from Kill la Kill. She never lets up her playful and carefree nature, wears frilly dresses, and loves breaking the fourth wall. She also gleefully recites how she was responsible for killing Ryuko's father. She didn't even let up her childishness while she sunk the Rending Scissors into him in a flashback.
- In Love Hina, Motoko's sister Tsuruko is usually calm and graceful, but when Motoko makes the mistake of being... creative with the truth in front of her, she drops that facade and out comes her Ax-Crazy side. Because of this and her Implausible Fencing Powers, Motoko goes back and forth between admiring her and being scared shitless of her.
- Magi – Labyrinth of Magic gives us Kouha Ren, a seemingly typical flippant prince of the militaristic Kou Empire... right up until he takes an extreme amount of glee in utterly decimating a gang of bandits that tried to rob his carriage.
- Quattro of Magical Girl Lyrical Nanoha StrikerS is sweet on the front, but this is revealed to be just an appearance.
- Mahou Sensei Negima!:
- Kumagawa of Medaka Box combines this with Stepford Smiler. His cheerful expression doesn't change no matter what he does; whether it's eating taiyaki (in the creepiest way possible), impaling people with giant screws, or blinding them.
- Yagami Yuu from Night Shift Nurses. When she's not being a good nurse who makes her patients comfortable, she's a psychopathic, murderous nymphomaniac.
- Chloe from Noir smacks of this, possibly going full-blown Yandere for Kirika by the finale
- Sugar, in One Piece, has the appearance of a little girl wearing a fairy-tale robe. She also has the ability to turn people into Living Toys, neutralizing them of their powers and strength, and forcing them to have to obey anything Sugar says. She has no qualms about abusing her powers to create a slave army of toys, and if she gets angry, she will use them on her own non-toy subordinates.
- Overlord brings us two. Clementine who gleefully delights in slaughter, all the while acting in a cutesy manner, and Lupusregina Beta. The latter has the title "Sadist with a Smiling Mask" and acts like your typical Genki Girl in front of her friends. People who spend any length of time can see its all an act though and even the people she's been assigned to protect are scared shitless of her. We get to see what happens when she's allowed to slip from her leash in the aftermath of the Battle of Carne Village. Let's just say that she earned her moniker.
- A lot of characters from Pandora Hearts are this when they're not being Yandere.
- Cilan probably. At first it appeared as though his burst came from his battle with Burgundy, but in later episodes he starts slipping into this more and more. His flip-outs are mostly played for laughs, though. Except for episode 69 where he flips his shit at Skyla because he didn't like her attitude problem as well as her not taking her job as a Gym Leader seriously.
- There is also the evil Togepi that appeared as a villain in a Generation IV episode. She spends the entire episode simultaneously tormenting Ash, his friends, and Team Rocket for no reason other than she likes seeing people and Pokémon suffer.
- Private Actress gives us Kana Juumonji, a sweet-looking person who commits all kinds of bad actions including downright murder or driving people to suicide while smiling angelically.
- Mari Illustrious Makinami from Rebuild of Evangelion 2.0. She only appears for roughly fifteen minutes in the movie, but these fifteen minutes show a rather nice character. As long as she isn't in an Evangelion, that is. When fighting, Mari is absolutely crazy - it is strongly implied that she actually fights simply because she enjoys fighting.
- Played for Laughs with Kafuka Fuura of Sayonara, Zetsubou-Sensei. This eternally happy, cheerful girl has an obvious and horrible past, involving suicidal parents, relatives in jail, ostracism at school, and at least one exorcism, and yet there she is, enjoying life... for a value of it. She shows no signs yet of snapping, though people are scared of her and fear the day she does. On one occasion, her classmate, resident Little Miss Snarker Meru Otonashi, tries to "read" what Kafuka is communicating through her eyes at her prompting; she sees nothing but a red screen with the words "die die die die die killy kill die die die" and so forth, despite Kafuka never once dropping her happy appearance.
- Patti Thompson from Soul Eater. Cute Cloud Cuckoo Lander who exhibits odd moments of manic violence when she feels like it. Really, we should expect this, considering she grew up on the streets with her sister, surviving by mugging random people. Her 'training' suggests she's a mad, violent thing whose skill in combat has been overshadowed (as is often the case for Weapons) by her extremely powerful Reaper meister.
- Kanon Nakagawa from The World God Only Knows. She's the epitome of the sweet, adorable idol... as long as you don't get on the wrong side of her stun guns, as Keima did. Kanon and Keima's very first interaction was the latter telling the former that he doesn't know who she is. Her reaction is to taze him repeatedly.
- Faye from Hex 11.
- Harley Quinn, a Canon Immigrant from Batman: The Animated Series. Easily one of the most adorable rogues on the series. Also likes to pummel people and shoot at them for fun. In the New 52 she's much worse, just as crazy as the Joker (having been dunked in the same vat of chemicals that drove him insane), and in some cases, even crazier.
- Rosy the Rascal from Archie Comics' Sonic the Hedgehog. She looks exactly like Classic Amy, but she's Ax-Crazy and has the mind of a child.
- Terra I from the 1980's "Judas Contract" arc of The New Teen Titans. Seems like a sweet young girl; is actually a vicious and ruthless mercenary with distinct yandere traits — she's not only sleeping with the much older mercenary/assassin who hired her, she ends up killing herself (while trying to kill him) when new Titan Jericho possessed the assassin, who just happened to be his father and freed the Teen Titans, making Terra believe that her lover betrayed her.
- Scarlet Witch is a notably attractive woman with a history of suitors and admirers, but she also has a history of psychosis due to her traumatic life experiences which are exacerbated by her powers that deteriorate her mental state at their peak. She is primarily responsible for the events in Avengers Disassembled and House of M, which respectively caused the downfall of her team and 90% of mutantkind being depowered around the world. The fact she was considered the nicest person in the team made hard for her teammates to believe her actions.
- The Truth About Bleach has murderous fugitive on the run Rukia, as well as Orihime, cleverly disguised as an Alpha Bitch until she brutally murders two soul reaper junkies over their stash of mod soul pills.
- A good part of the Axis Powers Hetalia concept 2P!Talia relays on all or some of the Alternate Coloring Characters fitting in this trope, even when there is next to none canon info on them aside of their looks.
- Agent Diamond, from Akatsuki Kitten: Phoenix Corporation Overhaul, seems to swing between this and The Fake Cutie. She is generally sweet and happy a lot of the time... she just has an extremely frightening tendency to do things like kill people adorably. There may be a Freudian Excuse behind that, as well as basic nature: she "used to be" Renesmee Carlie Cullen and has only grown less human in mind since then.
- This happens to Sweetie Belle in Cardfight!! Vanguard - Equestria Arc after she aquires PSY-Qualia.
- Ganmed from Hivefled, who is "surprisingly CHEERFUL for a devout member of a faith which focuses so heavily on DEATH," has shades of this. He's an upbeat, kind of troll who writes bad Self-Insert Fic and commits troll sacrifice without any qualms. Much of the "psycho" is Deliberate Values Dissonance, as troll culture in general is pretty violent. However, a few of the more stable cast members do suggest that a moirail would do him good (the implication being that he needs a stabilizing influence).
- Harry/Tristan in The Jaded Eyes Series. It's lampshaded when Tristan, is in his next incarnation, is seen and pitied by one of the slaves who thinks that that poor child being held captive by the Dark Lord... until she realizes that the child isn't being held captive and is in fact far worse than the Dark Lord.
- Light Yagami/Kira in A Charmed Life as lampshaded by Ryuk.
"You are just too damned cute, you know?"
Kira shot him a glare.
"I'm not cute," Light snapped petulantly.
- Zara the White Ranger from Power Rangers: Shuriken Force. She's extremely cheerful and constantly trying to see the best, but it's real noticeable there's something unhinged about her, especially when in uniform and she's downright giddy when killing the villain's footsoldiers, and practically hysterical when angry.
- "Sweetpea" in Except It Abide In The Vine. Out of combat, he's a Long-Haired Pretty Boy Gentle Giant Cuddle Bug and the biggest Woobie in a cast full of them. In combat, he's a giant berserker killing machine with occasional cannibalistic tendencies. Although to be fair, his backstory combines the most traumatizing parts of the Winter Soldier's and River Tam's pasts, so the poor guy has his reasons for being a little... eccentric.
"He's the Li'l Bub of giant mentally unstable cannibal cyborg assassins."
- The main character of Little Sweetheart, Thelma. She's a cute little 9-year-old girl (admittedly, with an odd resemblance to a certain The Good Son star, though that came second) who is skilled at blackmail and stalking, and willing to murder her only friend because she was going to ruin her plans.
- Libbie/Boltie from Super. And how.
- Becky from Drop Dead Gorgeous is a pretty, smiling beauty queen... until someone gets in her way. Then out comes her shotgun.
- The Maids is about a couple of sisters serving as maids. Their mistress loves how sweet they are and how well they serve her. Poor madame just doesn't know what they do with her clothes when she's absent. Mistress is a kind of yandere herself, just not as wicked as her maids.
- The hook of the Torture Porn film Neighbor is that the killer ("The Girl◊)" is an extremely ditzy, hot, and sadistic bitch.
- Annie Wilkes, as played by Kathy Bates in the film version of Misery. Look below...
- Speaking of Kathy Bates, she plays a seemingly friendly Squirrel Lady in Rat Race. Two women in a car stop where she (and her squirrels) are on the side of the road. She tries several times to get them to buy a squirrel, but they only want directions. She gives them very specific directions before sending them off with a paper bag marked "I <3 SQUIRRELS". The women follow the directions that send them down a very steep incline. As they plummet, they pass several signs with one word written on each: "YOU... SHOULD... HAVE... BOUGHT... A... SQUIRREL". They end up in a ravine atop a large pile of vehicles...and a skeleton holding an I <3 SQUIRRELS bag falls onto the windshield.
- Angela Baker from Sleepaway Camp II: Unhappy Campers and Sleepaway Camp III: Teenage Wasteland.
- Brenda Bates from Urban Legend.
- Tracy Flick in Election.
- Sarah Jane McKinney in Miss Nobody is one of the sweetest people you could possibly meet... and she thinks little of murdering people to get ahead at work.
- Lucindia◊ from Hell's Highway. Being cute makes it pretty easy to be picked up by people, who can then be brutally murdered For the Evulz.
- Belle Blake, from Malavita, is a cute blonde teenager who just happens to be proficient with weapons and beats the crap out of a sleazy boy with just a tennis racket. Justified as she's a Mafia daughter in hiding with her family.
- The little girl from The Bad Seed. So pretty. So polite. So well-behaved. She's also a sociopathic serial killer.
- Hayley from Hard Candy looks like a sweet teenager on the outside but on the inside she is pitch black.
- Norman Bates, as the titular psycho of Psycho, has very cute mannerisms and verbal tics (nibbling candy, giggling, stuttering, saying "sorry" and "gee") and his boy-next-door looks don't hurt anything, but none of it changes the fact that he's completely bonkers.
- The Killer Rabbit of Caerbannog in Monty Python and the Holy Grail looks exactly the same as a regular rabbit, but it will kill anyone foolish enough to come near it without blinking.
- Helen from Wildbow's "Twig" is often bubbly and adorable, but asking her questions can lead to being horrified and unable to unhear the answer however much you want to.
- As mentioned, Annie Wilkes from the Stephen King novel Misery is an archetypical example. A qualified nurse, she rescues the main character and her zealously favorite author, Paul Sheldon from a car crash in the middle of a blizzard and cares for him. Unfortunately, Paul later finds out that she is a psychopathic, schizophrenic Serial Killer who has no qualms against chopping off his foot with an axe and cauterizing the wound with a blowtorch if he acts up.
- Kaitlyn Wernher from Dark Red Mind.
- Amy Elliott Dunne from Gone Girl practically defines this trope.
- In Dora Wilk Series, Joshua's "definitely-not-my-girlfriend" Laoise fits. On one hand, it seems she's genuinely sweet and nice person. On the other, she's psychically unstable, which combined with her Playing with Fire abilities creates a rather bad mixture.
- In The Pale King, Toni really loves her dogs.
"Now I'll know. If anything happens to these dogs. If they run off, or limp, or anything - I'll kill you, your family, burn your house down, and sow salt. I have nothing to live for but these dogs...But if anything gets done to these dogs I'll decide it was you and I'll sacrifice my life and freedom to destroy you and everyone you love."
- Sharon Falconer from the novel Elmer Gantry and its adaptations. She cultivates the outward appearance of a successful, articulate preacher, but Elmer discovers that she is deeply disturbed. In private, she toggles different personalities, including a petulant child-like persona and a pseudo-pagan priestess.
- The Fox from Seanan McGuire's Newsflesh trilogy.
- In the novel and movie The Bad Seed, Rhoda Penmark is an angelic little girl who loves her mother "Thissss much" except when she's drowning a boy who won the spelling medal she wanted, setting a dim-witted man on fire because he seemed to know too much, pushing an old woman down a flight of stairs for her snow-globe
- Alina Galenko from the web novel Animas Conquest is a charming, pigtail-sporting neo-hippie of sorts who is absolutely not above kidnapping and terrorizing the faculty of Salva Academy.
- The Poem from The Dollmaker is a tiny and beautiful woman. She's also a horrifying sociopath.
- Kitten, the main villan in Price is a sadistic rapist, can figure out how to kill people just by looking at them and looks 14 years old.
- Phaidor in The Gods of Mars is described as a beautiful young girl, who is first introduced as a Distressed Damsel captured by raiders. She is also an White Martian princess, belonging to a evil race of cannibalistic mystics with god complexes. Her Establishing Character Moment is giving a Slasher Smile to the hero when he declares he will kill all her captors, which creeps him out immensely.
Live Action TV
- Angel: Fred's tendency to be this is never completely gone - just dormant.
- In Game of Thrones, a cruel process of Break the Cutie has brought this out in young Arya Stark, whose "evening prayers" now consist of a list of enemies she intends to kill. It's illustrated at its best near the end of season three, when she calmly informs Sandor Clegane that she will stick a blade through his eye and out the back of his skull some day. The next episode, she hammers it home by catching a Frey soldier off guard with feigned cuteness and vulnerability, then repeatedly and viciously stabbing him, all without showing the slightest remorse. Keep in mind that she's barely more than a child.
- Alicia Baker and Bette / Plastique from Smallville.
- Cassidy from Veronica Mars. Think he's the sweet, nerdy, helpless guy? Ha. More like rapist and mass-murderer. Have fun!
- Elle Bishop in Heroes, a cute, childish, and sociopathic woman who delights in killing, hurting, and controlling people.
- The Trinity Killer from Dexter. It's also an inversion; we see the dark side first. It's the "nice guy and family man" side that comes as a complete shock.
- All That's "Ask Ashley" featured a sickeningly sweet little girl with an insanely unstable temper answer moronic viewer's mail. Hilarity Ensues.
- Gem and Gemma of Power Rangers RPM are a mild case. Mentally, they're about kindergarten age, and their favorite things in the whole wide world are explosions. Especially when it's the evil Killer Robots going boom. The reason they're only a "mild" case is that they don't really want anyone hurt (though there was one time they had to be reminded that there were civilians enslaved in a factory they planned to "vaporize from sub-orbit").
- The third series of The Thick of It introduces us to Steve Fleming, MP, who is a spectacularly unstable version of this trope; that cheerful grin, the slightly creepy compliments and the "call me Uncle Steve" attitude you see when you first meet him? Get him even slightly agitated and his Ax-Crazy side will come to the fore. The scary part comes when he desperately tries to suppress his insanity, swinging from Stepford Smiler to Unstoppable Rage and back again so violently you wonder he doesn't give himself whiplash.
- Hooch from Scrubs. He's normally friendly and even charismatic, but pissing him off triggers his Ax-Crazy tendencies. This leads to J.D. and Turk frequently playing pranks on him to trigger his psychotic side, at one point even eating popcorn while Hooch is throwing death threats around. It becomes clearer with every appearance that the catchphrase "Hooch is crazy" thrown around by other characters is not exaggeration. After another of J.D. and Turk's pranks, he takes four people hostage and is subsequently fired from the hospital. In the very last episode of season 8, we see him in a straitjacket, proclaiming "Hooch is crazy."
- Rachel Berry definitely is a high-intensity-low-stability kind of girl, with her Serious Business approach to... well... everything. It's absolutely adorable when it's not just infuriatingly annoying, especially to her fellow Glee Clubbers who just seem visibly tired of her antics at times.
- Quinn can be incredibly sweet and endearing when she's not screaming at someone or going to absolutely insane extremes just to feel good about herself again.
- In Sherlock, awkward, Adorkable, Camp Gay, Jim from IT, whose last name is Moriarty.
- Bernadette from The Big Bang Theory is a mild version of this trope, usually sweet, demure, innocent, even a bit of a woman child at times, but she has a very short fuse and is extremely impatient and will go off on someone over seemingly small things and is quick to give Howard ultimatums if he has a dilemma that involves her. She also almost never stops smiling. And it's always the exact same toothy smile, even when she casually mentions the potentially weaponizeable biological specimens she's working with, or threatening someone with grievous bodily harm.
- Another mild example is Annie from Community: she is generally sweet and well-meaning, but minor things like a C grade or a lost pen have been known to make her crazy and/or violent for a while.
- Firefly's River is generally a cute, sweet teenage girl who is friendly and playful. She's also a government-manufactured killing machine with Psychic Powers and spent three years being experimented on, trained, and surgically enhanced until her mind could no longer filter or control incoming stimuli. As a result she is an unstable schizophrenic with ingrained martial arts and assassination training who often flips out without warning.
- Buffy the Vampire Slayer: Drusilla Keeble is soft-spoken, loves dolls and has a child-like innocence and affection for her "family" which can on occasion come across as vulnerable and sweet. She's also an omnicidal, certifiably insane vampiress who has on occasion been known to slit throats with her own nails. She was led to believe she was evil by Angelus who stalked, tortured and assaulted her for years until she finally turned insane and was turned into a vampire to suffer for eternity, so by this point the "psycho" part of this trope is quite understandable.
- Doctor Who:
- The basic characterization trait of the Fourth Doctor. He's naturally extremely cute and childlike and knows it (exploiting it as Obfuscating Stupidity to make his enemies assume he's silly and harmless), but also an extreme Nightmare Fetishist and occasionally dips into Blue and Orange Morality. Much of the appeal of his character comes from his ability to display both the "cute" and "psycho" sides of his personality at the same time.
- The Tenth Doctor is also like this. He's handsome and charming, with many eccentric quirks and a fun, bouncy personality. Underneath that, though, Ten is seriously screwed up, largely due to the trauma and guilt he carries from the Time War.
- In the two-parter "Human Nature"/"The Family of Blood," he becomes human, adopts the identity of kindly schoolteacher "John Smith," and loses his Time Lord memories and his "psycho" side. When he finds out what he used to be, he does not want to go back to being the Doctor - because that would mean reviving the "psycho" in him. Duty calls, though. So after becoming the Doctor again, he promptly defeats the villains of the week and sadistically punishes them with various And I Must Scream fates for eternity.
- In the episode "The Waters of Mars," Ten meets a woman who is fated to die, and is heartbroken that he can't save her. Without a companion around to keep him under control, Ten decides to save the woman, laws of time be damned - even though he could destroy the spacetime continuum in the process. And he doesn't take long to jump off the slippery slope and decide that as the last of the Time Lords, he makes the rules of time. After declaring himself "the Time Lord Victorious" and starting to behave eerily like a certain other Time Lord, Ten is only jolted out of "psycho" mode after the woman he tries to save kills herself in order to set time back on the right course.
Tenth Doctor: There are laws of time. Once upon a time, there were people in charge of those laws. But they died. They all died. Do you know who that leaves? Me! It's taken me all these years to realize that the laws of time are mine and they will obey me!...For a long time now, I thought I was just a survivor, but I'm not. I'm the winner. That's who I am: a Time Lord Victorious.
- In her youth, before her Heel–Face Turn, River Song was raised as a Laser Guided Tyke Bomb by an Ancient Conspiracy who intended her to murder the Doctor, but she was every bit as sexy and quirky as the good River we all know and love.
- Helena from Orphan Black is an Ax-Crazy fanatic with a murderous hatred of clones (not knowing she's a clone herself). But she's beautiful, quirky, sympathetic, and one hell of a dancer.
- Mel from Flight of the Conchords. She does things like bake the band the cookies and has a not-so-secret crush on them that leads to some awkward moments between them. This description, although while accurate, would give you the impression that she was an Adorkable Dogged Nice Girl. But she's not, she's actually an insane Stalker with a Crush. And those awkward moments are the result of her creepiness and the fact that she sometimes coyly hits on them in front of husband.
- On the Soap Opera The City (a retooling of Loving), the cast was being stalked by a Serial Killer. Much to the audience's shock, it was soon revealed to be petite, perky blonde Molly Malone.
- While bordering on and sometimes crossing over into Ms. Fanservice in her initial WCW run, this trope was the case in TNA. On TNA Xplosion, Don West described Daffney as "Just crazy enough to attract you and just crazy enough to make you want to get the hell away." When forced into a strip tease after Impact went to Monday nights she proceeded to give perhaps the most unsexy undressing a genuinely attractive person ever gave on Spike TV, as her eyes screamed "Die". She also got herself cutup more than all the other knockouts, perhaps barring Roxxi, usually when her own designs to maim people backfired.
- Was, or at least became the gimmick of Lin "Bitch" Bairon in SMASH. She had to be restrained by a chained dog collar before matches.
- Subverted at first in SHINE, as Kimberly started to let herself go in the earliest stages of her Sanity Slippage, but then her losing streak was over and she cleaned up, during the latter stages.
- Forgotten Realms sourcebook Shining South got a sample NPC like this. A smiling half-drow (and both halves do work in her favour) cutie with Girlish Pigtails. In a tasteful armor, with short sword and composite bow. According to her stats, a Talos-worshipping Neutral Evil ranger / shadow marauder. As in, a Dambrath noble pillaging neighbour countries more for the fun of it than any economical benefits, and trained to not be stopped by boring things like fortifications for longer than an eyeblink.
- Venus from Metal Gear Ac!d 2 is an extremely beautiful Femme Fatale, and seems flirtatious, sexually confident, and yet somewhat vulnerable at first. She also kills a frightening amount of people in cold blood and seems completely incapable of actually feeling normal emotion despite her seductive, romantic play-acting. It's easily her sexuality which is her most screwed-up trait - during the game, she gets aroused at least once by dowsing (in a Does This Remind You of Anything? comedy scene), shuriken, murder, a corrupt genocide incident, a Mad Scientist experimenting on little children, her partner killing people, and her partner nearly getting blown up. Her partner, naturally, is creeped out horribly by her.
- Touhou has Flandre Scarlet, who, after spending almost five hundred years in the basement of the Scarlet Mansion to protect people from her immense powers, has the mind of a child and a poor understanding of restraint, only wanting to play but with a tendency to "break" those she plays with. She isn't exactly murderous, but she's unstable enough that Marisa - who has fought some of the most powerful denizens of Gensoukyou, which includes a few resident Physical Gods - actively avoids her whenever she goes to the Scarlet Mansion to steal books.
- Darkstalkers has Bulleta/B.B. Hood. Adorable, Moe-laden Token Mini-Moe on the outside. Ax-Crazy Psycho for Hire Bounty Hunter on the inside.
- Teemo in League of Legends, a Moogle rip-off who couldn't care less about all the people he kills, but is slowly cracking from prolonged isolation from others of his kind.
- Mimi from Super Paper Mario. Just before her boss fight, her head turns upside-down with an audible crack and explodes, and spider legs come out and carry her body around. The paper that is her head is crumpled up, possibly to signify the insane head trauma.
Mimi: I'll shred you all like bits of confetti!
- Lovrina of Pokémon XD: Gale of Darkness fits the bill perfectly. A cute, ditzy Valley Girl with a penchant for 'beautiful' Pokémon... who is also the Evil Genius of a criminal syndicate responsible for the routine Mind Rape of Pokémon in order to transform them into soulless killing machines. She turns very nasty when pushed, and one of her subordinates describes her as "nothing short of terrifying".
- Alice from Tales of Symphonia: Dawn of the New World applies to this: While she appears to be a cute, innocent girl, she's actually the leader of a terroristic army, being called a sadist by one of the main characters.
- Twins Mireille and Mischka in Valkyrie Profile: Covenant of the Plume, the former being female and the latter male. They kill purely for fun and hold a total lack of compassion for those they fight against, and ultimately kill - even when it is not necessary, such as butchering a soldier who surrenders. Neither of them care to even hear the plight of rebel leader Natalie, who they kill. She is implied to be their mother, unbeknownst to them. This disgusts even Wylfred, a character who sacrifices his own friends and childhood companions for the sake of revenge.
- Blackbird from Strife. She actually gets excited when you find new weapons and starts talking about their killing potential. Not to mention that this seems to be her preferred method of dealing with most problems that come up. To be fair, this is a First-Person Shooter, so powerful weapons usually are a great way to deal with most problems that come up.
- In Blaze Union, we get Eimi, also known as Garlot/Gulcasa's sister Emilia. Nothing could be more adorable than her in the whole game... But if you go for the B route and field her too many times in battle, her love for her Brother Captain and her other friends, together with her desire to be useful to them, ends up turning into what drives her over the edge. As a result, Brongaa's blood manifests at full power in her, and she becomes a monstrosity that will remind many Deptheavenites of Brongaa Possessed Gulcasa. At this point, she is bent on nothing but destroying anything that stands in her way, and Garlot is forced to put her to the blade, both to put her out of Brongaa's torment and to assure his survival and that of everyone else.
- Ripper Roo from the Crash Bandicoot series, while at first completely insane, becomes like this after the epilogue of the first game, where he is stated to have undergone intense therapy and higher education.
- Iris Sepperin from RosenkreuzStilette is generally a prim and proper little girl over the course of the first game's story. Then, just before the final battle, she starts laughing madly and quickly shifts from her affable attitude to motormouthed insanity and arrogance during her Villainous Breakdown.
- Tiny Tina (subtitle "world's deadliest 13 year old") from Borderlands 2 decorates her house with bunnies and is fond of tea parties. In which she uses electricity to torture a bandit to death. Said bunnies are also filled with explosives, the use and making of which Tina is very proficient in. She also talks like a pimp and describes the aforementioned bunnies very... strangely. Yet, she's still extremely huggable.
- From the same game, there's also Gaige, the Mechromancer. For a school project, she developed DT (later renamed Deathtrap), a robot bullying detergence - with razor claws and lasers, who proceeds to kill her rival when she threatens her. Her skills, apart from improving Deathtrap, allow Gaige to build up Anarchy, which improves her damage, weakens her Accuracy and makes her sound slightly unhinged.
- Harley Quinn has always been this, but in Batman: Arkham City it goes to new heights. Her goons think she is worse than The Joker.
- For all that Selphie of Final Fantasy VIII is a sweet little Genki Girl, she's also far and away the most violently pragmatic of the player characters. Whenever she's involved in the planning phase of a mission, she always seems to suggest using explosives. When planning how to escape D-District, while a Moomba is in the cell with everyone, she casually suggests skinning it and wearing it as a disguise. It's hard to tell if she was actually joking or not.
- Fire Emblem Awakening:
Noire: BLOOD AND THUNDER!!!!
- Noire comes off as a delicate and soft-spoken young lady who has a timid demeanor due to being used as a guinea pig for her mentally-unstable mother's curses and coming from am incredibly doomed Bad Future. However, also BECAUSE of that, she has formed a split personality that surfaces whenever she gets fed up with the antics of her comrades or during the heat of battle. This side of her is also a bit of a ham.
- Henry is unfailingly cheerful, but almost every single line coming out of his mouth reveals his very screwed-up psyche that comes from a horrifying Dark and Troubled Past.
- Jenny Jaros of the Saints Row: The Third expansion Gangsters In Space. Hoo boy. She's taller than Female!Boss, plays a Purple Skinned Space Babe, incredibly fit, and clearly works out judging by her figure. She starts out as a true Nice Girl in awe of working with the leader of the Saints in a film, and the director punts her like some Jerk Ass Take That combination of Hideaki Anno, Christian Bale and Joss Whedon. Boss; who can easily qualify for this trope themselves, pets, strokes, nurses, caresses and generally takes her under her\his wing in the face of all this abuse, and when the director goes one step too far and tries to replace Jenny she reacts by gunning down the extras with prop firearms, then beating them to death if Boss stays around. When the Director reveals he is actively trying to kill them in the movie Jenny snaps, and in a scene that frightens even the Anti-Hero Badass In Charge Devil in Plain Sight Boss runs down the director in a spaceship, killing him. Apparently Jenny has anger management issues but hot damn was it not deserving.
- Professor Genki as well, being a big, cuddly-looking pink cat with comical Nerd Glasses who yells in enthusiastic broken English... and loves him some Murder Time.
- Phantasy Star Online 2 has Lisa, who's a Cast and an instructor for rangers. She's always smiling and full of enthusiasm, but her conversations typically revolve around her love of filling things with lead and/or blowing them up. Her fanbase constantly makes the mistake of calling her yandere in spite of the fact that her personality is considerably childlike and she thus has no real interest in intimate relationships.
- There are many cutesy and lovable demons in Shin Megami Tensei, like Mascot Mook Jack Frost, Pixies (most Fairies), or even recurring demon Alice. None of them will hesitate to rip you to pieces if you aren't quick to deal with them with either firepower or some damn convincing gab.
- Mogeko Castle has the Mogekos, little yellow cat-like creatures with curly tails who love prosciutto... and also high school girls. In very disturbing fashion. They love playing with high school girls, and don't particularly care about consent.
- Mogeko leader Moge-ko is a textbook example.
- Also from Mogeko games, Rawberry from The Gray Garden, a cute little pink-haired demon who will murder and devour anything in her way when she's not sleeping. Including her teammates.
- The titular Cute Ghost Girl of Spooky's House of Jump Scares is heavily implied to be not as innocent as she looks. Aside from the fact that her house is full of monsters and experiments, an in-game note has her laughing at her head scientist's concerns before leaving him to be killed. The three mini-games feature her brutally murdering people. She also sounds increasingly more disappointed that you survived as you go further through the game. In addition, there's this image released for the December update, which implies she murdered Santa Claus. It turns out that she is fully aware of how cute she is, and hates it. In fact, the entire reason she keeps a house of monstrosities is so that people can die in it and she can use their ghosts to form an army. Why? Because she won't be called "cute" anymore, of course.
- Ayla from Awesomenauts is cute Sadak child with psychokinetic abilities. She is also a psychotic prison escapist with a penchant for starting fires and destroying property.
Ayla: I'm a buttercup as sweet as can be. Please won't you buy some DESTRUCTION from me?
- Hina as Hibachi in DoDonPachi SaiDaiOuJou.
- Ace Attorney:
- Dahlia Hawthorne, Phoenix Wright's girlfriend in Phoenix Wright: Ace Attorney: Trials & Tribulations seems nice, pleasant, frail and feminine... but when Mia finally brings her to justice for her various crimes, she glares at her with Glowing Eyes of Doom while swearing revenge. Said revenge involves coming Back from the Dead to murder Mia's sister Maya, who had done nothing to Dahlia, simply because Mia was already dead and beyond direct punishment.
- There are a few male examples: Matt Engarde in Justice for All, Kristoph Gavin in Apollo Justice and Souta Sarushiro/Simon Keyes in Ace Attorney Investigations 2.
- The Villain Protagonist of Yandere Simulator looks like an Ordinary High-School Student, and can interact like her classmates like a completely normal teenage girl. However, she's actually an Emotionless Girl who stalks the first person who made her feel anything, and will murder anyone who gets in the way. Depending on how you play, she can be a Manipulative Bitch, a pragmatic villain, or an outright Serial Killer.
- Sho of Crimson Rafflesia is a psychic power user who breaks into fits of giggles while brutally dismembering people.
- Tsukihime features Kohaku, who appears to be a constantly smiling maid, but who actually is responsible for most of the tragic events of the novel. One of the first tip-offs that something is off is that whereas her Emotionless Girl sister Hisui occasionally shows emotions such as surprise, embarrassment, or anger, Kohaku never loses that smile...
- Higurashi: When They Cry features some of the more well-known ones, such as Rena Ryugu up there in the page image. A lot of the times the characters are delusional, so that either makes them Cute and Psycho or makes them appear Cute and Psycho. It's implied that all the central characters except Mion, Rena included, contracted Hinamizawa syndrome during many other iterations of the "Groundhog Day" Loop each; Rena would be a straight example in every one where she did. We're just only shown one. Well, there is another example of her going Cute and Psycho in the PS2 arcs.
- Umineko: When They Cry:
- Maria Ushiromiya. In some scenes, the cutest little girl imaginable. At others, well...
- Her mother Rosa can swap between loving and motherly and abusive monster at the drop of a hat. This being the result of her being severely bipolar combined with possibly having PTSD as the result of a harsh childhood and certain incidents shown in the 3rd novel.
- Kozue in Chaos;Head. For a Cute Mute , she sure seems awfully indifferent to the idea of killing people. Well, killing jerks. Hell, she got her sword in the first place so she could kill.
- Played for laughs with Riko in A Profile. As Masayuki's stepmother, she's very easily influenced, strong willed and tends to have thought processes at right angles to any normal person. Thus, she is prone to brainwashing her children and any number of other odd things.
- Shiraki Aeka from Yume Miru Kusuri is a horribly, horribly justified example.
- Ilya in Fate/stay night, which is rather baffling to Shirou. Eventually he decides it's because she has no sense of right and wrong, and instead acts on any desire she has, no matter what it is.
- Kazuaki Nanaki (aka Hitori Uzune) Hatoful Boyfriend. He's a sleepy, gentle teacher who just happens to be so traumatized by the death of his brother Nageki that he's constantly haunted by a shadowy manifestation of his guilt that he believes to be Nageki's ghost hating and blaming him for his own death that drives him to do some truly creepy things near the end of the Bad Boys Love route, descending into a Madness Mantra as he does so. Another character tries to help him and is almost strangled, and correctly concludes the following.
"He looks pretty gentle on the outside, but I think he's pretty messed up inside."
- Akane in Suika. And also quite the Shocking Swerve.
- Junko Enoshima from Dangan Ronpa.
- From the sequel, Super Dangan Ronpa 2 Mikan Tsumiki is an interesting case, as she's cute before catching the despair disease, but after she's revealed as a killer, she loses the cute factor quickly. However, if you play through her free time events, she still has that sadistic side, she just hides it better.
- From the spinoff, Absolute Despair Girls, Monaca.
- Sho, the Villain Protagonist from Crimson Rafflesia frequently changes her personality from cute and adorable to a creepy psychic murderer.
- Irina from Rasputin Catamite looks like a cute porcelain doll with pigtails, and speaks in third person, but seems to enjoy hacking people to death with an ax.
- Sophie from The Overture is the most vile example of this. She uses her child-like appearance and sweet singing voice in order to lure children into her grasp. She then proceeds to torture them in order to hear their screams.
- Tilly from Waste Of Time can be very cute and charming, but she will threaten to hurt you without hesitation.
- Buwaro from Slightly Damned is a demon, but he loves everything and everyone. He'll invite you to play catch, or explore, or just give you a great big hug. But if you value your life, do not remove his star pendant! While he goes berserk without it, it is not a Berserk Button, but a medical condition which the pendant is magically treating.
- Errant Story: Concussion is a cute little fairy nurse eager to help you. Her name is not an oxymoron, it is an euphemism.
- Fuchsia from Sinfest, though she had a short period of Yandere.
- Hinted at with The Little Girl and "Mr. Duck" from Johnny Optimism.
- Zoophobia has Cameron, a go-getting, curious young woman, who happens to be psychotically neurotic when in uncomfortable situations, or when around animals.
- In The Inexplicable Adventures of Bob!, adorable Cute Monster Girl Molly has an identical twin sister (well, clone) named Golly, who varies between Deadpan Snarker and stark raving megalomaniac.
- Subverted in this Friday 4 Koma.
- Three examples come to mind on That Guy with the Glasses; Ask That Guy, with his poshness and suaveness hiding a monster, Bennett The Sage, who looks sweet and cute but can terrify Ask That Guy, and The Nostalgia Chick, who really is girly and generally decent, but has a mess of issues and sociopathic qualities underneath.
- Pink and Blue from Charlie The Unicorn. Cute little innocent sickeningly optimistic and 'imaginative' unicorns, who pull elaborate traps for Organ Theft.
- The Gaming Pixie, apparently, particularly when she reviewed Eversion. The review starts off cheerfully enough... and slowly descends into fearsome. Much like Eversion itself.
- The Laughing Clown from Dark Dream Chronicle types in pink and generally acts like a little kid. She's also dangerously psychotic, once biting someone's tongue out for "shiggles". Even the other members of the cast think she's completely insane.
- Survival of the Fittest has a fair amount of these sort of characters, mostly of the Beware the Nice Ones variety. A textbook example of this trope, however, would be Mariavel Varella of v2. Due to abuse at the hands of her father, she can go from a cheerful teenage girl to a hardened Delinquent who apparently once beat a man to death with a baseball bat before being abducted. And when she gets to the island... well, she just gets even more crazy.
- Jade Sinclair (codename Generator) of the Whateley Universe. She's cute and sweet and cheerful. She looks like she's ten or eleven. She 'invents' wacky devises. She looks like the harmless member of Team Kimba. Right up until she handles an attacker by stapling him to a tree with railroad spikes through his arms and body, and burns a message into his flesh.
- Flippy of Happy Tree Friends, as he's calm and sweet part of the time, but the minute something triggers him (by reminding him of his time in the Weaponized Animal Regiment), whether it be something like a car backfiring, the sight of a knife, fire, or an airplane, he flips out and switches to his other personality, Fliqpy, and starts killing everything around him rather creatively and brutally with a huge Slasher Smile on his face.
- Based from a murder case that occurred in Japan in 2004, "Nevada-tan" became the memetic Moe Anthropomorphism of the concept.
- RWBY has a heroic example in Nora Valkyrie. While she is a Cloudcuckoolander Genki Girl, she also has shown Blood Knight tendencies on multiple occasions. For the most part she is a Badass Adorable, but...
- Villainous example with Neo. Cute, pint-sized, and certainly psycho◊.
- Kakos Industries has Hailey Solomanari. She's adorable and girly to a fault with a sweet voice drenched in Valley Girl speak but is also easily the most violent and intimidating character even when the cast is composed of nothing but villains. She's murdered people simply by having sex with them and relishes in absorbsing power from all the weak humans she's "fed" off of. When given a place of power for a few weeks, she just murders and feeds off more people all while narrating her achievements with the same cutesy dissonance.
- Jane Dean of The Veronica Exclusive is a murderous psychopath, but it's easy to forget when she's charismatic, charming, and looks like this◊. Megan Lambie's prettiness is part of what makes the "psycho" part so unsettling.
- Terra from Teen Titans is somewhat like this. She seems friendly, funny, and kind, although her Dark and Troubled Past has saddled her with destructive tendencies that can, and if helped along by Slade, will, manifest as homicidal psycopathy. Her switch from a cool gal-pal to Slade's Apocalypse Maiden was astoundingly dark, given the show's track record at the time.
- Jodi from Titan Maximum is showing signs of being this.
- Adventure Time:
- Princess Bubblegum is not only a Lady of War, she's a Science Hero who's capable of resurrecting the dead— and she's completely adorable to boot. However, she does not have a Berserk Button—she has a berserk keyboard, and she will go Laughing Mad Ax-Crazy on you if you happen to hit a button. Usually though? She's genuinely very nice.
- Flame Princess has a Hair-Trigger Temper and she's destructively powerful, capable of setting kingdoms (and at one point the entire planet) ablaze and she's evil; she could get mad at any time. But when she's not mad, she's really cute.
- My Little Pony: Friendship Is Magic:
"You're... going... to LOVE ME!!!!!"
- Fluttershy, the shrinkingyest, sweetest, one of the most precious of the ponies in Equestria... and also the scariest pony in all Equestria. Threatening her friends will put you on the receiving end of her Stare, which made an adult dragon burst into tears. Some well-intentioned assertiveness training resulted in a complete 180 flip from an Extreme Doormat to a violent, hateful bully. And after a bunch of animals refused her offer of friendship, well...
- Pinkie Pie's Genki Girl nature survives most things, and if it doesn't most of the time it means she only becomes depressed. But you should still never break a Pinkie Promise.
- Twilight Sparkle is Cute Bookworm extraordinaire and the Only Sane Mare in Ponyville most of the time, but multiple episodes showed that she can be more unstable and dangerous than the rest of the mane six combined, with one scene from "Lesson Zero" taking the trope to an art form.
- Princess Luna is this in Physical Goddess form. She is the very definition of Adorkable and has the absolute cutest facial expressions in a show that seems to run on cute facial expressions. Yet the first time we meet her she is an Omnicidal Maniac who is trying to bring forth The Night That Never Ends and is consumed by envy of her sister's greater popularity. Even after she is cleansed of all evil she retains a Hair-Trigger Temper which expresses itself through her fondness for summoning lightning in the sky to add emphasis to her sentences.
- Codename: Kids Next Door:
- Numbuh Three, when you get her angry enough. Her little sister is even worse.
- Lizzie in her first few appearances, before she mellowed out and became a Clingy Jealous Girl.
- Sonia looks like a sweet little girl who doesn't belong in a world of kids fighting adults, but then you tell her you're going to shove her into a dark place. Prepare to get your ass kicked.
- Metalocalypse has Toki Wartooth, Dethklok's adorably immature rhythm guitarist, has what could be called an unconventional mental state. Sometimes, this manifests as pastel-colored acid-trip musical numbers. Unfortunately, he also has substantial anger management issues, particularly when the show's been putting him through a round of Break the Cutie.
- The title character of Kaeloo. While her Jekyll-and-Hyde-esque split personalities physically differ (cute, innocent frog and violent tower of toad muscle respectively), they overlap so heavily in the later episodes that some scenes give off the impression that at times Hyde Plays Jekyll.
- Family Guy: Joan is shown to be very sweet and she falls in love with Quagmire. The two were married, but when Quagmire mentioned the prospect of divorce, Joan does a complete 180 in her mannerisms and threatens to kill herself and Quagmire.
- Izzy from Total Drama is this in spades. In Revenge of the Island, Zoey is this and Beware the Nice Ones personified after she's pushed too far.