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[[quoteright:350:[[LightNovel/HaruhiSuzumiya http://static.tvtropes.org/pmwiki/pub/images/RyoukoKnife_9397.jpg]]]]
[[caption-width-right:350:I just, [[LikeIsLikeAComma like]], stabbed some loser to death.]]

She's cute. Beautiful, in fact. Friendly and popular. She's the head of the class in terms of looks, money and everything that counts for her approval rating, but she's not the AlphaBitch, even if she has a GirlPosse or the entire grade on her side. One of ThoseTwoGuys might have a crush on her, even though he [[DoggedNiceGuy never gets anywhere]]. She's the perfect girl...

...except there's something not quite human about her, and she's secretly out for your blood.

The Uncanny Valley Girl is smarter than she lets on, and puts on a very convincing persona that's made the class adore her. It's the [[{{Joshikousei}} high school girl]] version of VillainWithGoodPublicity, except the publicity is good enough that nobody, not even TheHero, knows she's the villain -- or anything other than [[{{muggles}} normal]]. Not until she comes at you with a sharp object, that is.

Compare {{Yandere}}, CuteAndPsycho, StepfordSmiler, LivingWithTheVillain, DarkMagicalGirl, FauxAffablyEvil, and BitchInSheepsClothing. Contrast AlphaBitch, FallenPrincess, LonersAreFreaks.

Note that the name comes from UncannyValley, not ValleyGirl.

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!!Examples

[[foldercontrol]]

[[folder: Anime ]]
* Ajimu Najimi of ''MedakaBox'' looks like a sweet angel and TooGoodForThisSinfulEarth, but it turns out she views people as indistinguishable from furniture and only seeks for a way to entertain herself.
* ''LightNovel/HaruhiSuzumiya'':
** Ryoko Asakura --''the'' Uncanny Valley Girl. She keeps up her charming persona and amazing smile even while ''trying to gut Kyon''.
--->'''Asakura:''' You think it's a... joke? Huh. You don't wanna die? You don't want me to kill you?
** In the tenth novel, [[spoiler:Emiri Kimidori]] is revealed to be every bit as apathetic towards human suffering as Ryoko, just less proactive about it.
** We eventually meet [[spoiler:Kuyo Suo]], a humanoid interface like Yuki. Unlike Yuki, she's an interface for the Heaven Canopy Domain, and is so [[HumanoidAbomination completely alien]] that [[WeirdnessCensor normal humans won't even acknowledge her presence]]. She speaks in stops and starts, inserting somewhat relevant phrases she clearly doesn't understand the meaning of here and there. She rarely moves, instead preferring to just appear places, and overall gives the impression of someone who simply has no idea how living things, let alone humans, act.
--->'''Kyon:''' A cardboard cutout would have had more life than her.
* In ''ShinMazingerZero'' three beautiful, tall, ponytailed, blonde triplet girls called Gamia Q1, Q2 and Q3 transferred to Kouji's high school. Given that they were gorgeous and friendly, even if they behaved in a strange fashion and looked a tad weird, all boys in class started to quickly slobber at them. In reality they were three androids (appeared for first time in the ''Anime/MazingerZ'' original manga and ''Anime/{{Mazinkaiser}}'') sent to assassinate Kouji Kabuto. Seemingly Kouji bought their masquerade, but shortly after he suggested them dropping their act, and he revealed that he had suspected it all along.
* Mio Hio from ''DNAngel'' fits this [[ValleyGirl to, like, a really creepy T!]] She's an [[{{Eagleland}} American]] {{Expy}}, even has one of ThoseTwoGuys when she's after the other [[spoiler: to either kill him or bind his SuperpoweredAlterEgo PhantomThief. DeathEqualsRedemption, which is, like, a drag.]]
* The ''VampirePrincessMiyu'' OAV give us a schoolgirl named Ranka. She's pale, beautiful, elegant, sweet tempered and ensnared the heart of the local ChickMagnet... [[spoiler: she's also a Shinma that [[PuppetPermutation transforms]] [[FateWorseThanDeath people into dolls]]. Her guy ''knows'' it and [[MadLove loves her that way]]. ]]
** To a certain degree, Miyu herself counts when she poses as a schoolgirl to fit better in the human crowd.
** Did we forget how [[spoiler: Chisato Inoue]] became one of these [[spoiler: after her Shinma awakening and her FaceHeelTurn?]] Brrrrr...
* From ''{{Mai-HiME}}'', there's [[RobotGirl Miyu Greer]]'s [[spoiler: [[EnfanteTerrible adorable]] [[{{Tykebomb}} little]] [[OlderSidekick charge]]/[[UnholyMatrimony soulmate]], Alyssa Searrs, the [[VillainWithGoodPublicity Golden Angel]] of the School Choir.]]
* Johan Liebert from ''{{Anime/Monster}}'' decides to pull a stint as an Uncanny Valley Boy in volumes 6 through 9, when he starts attending University of Munich as part of a plan to get at Hans Georg Schuwald and puts up a front of the most mind-bogglingly perfect human being in existence. When Schuwald is finally confronted with the possibility that his new student secretary is a psychotic bastard that's probably planning to kill him, Schuwald isn't even the least bit surprised. Why? Because he was so damn perfect that he just ''had'' [[VillainWithGoodPublicity to be evil]].
* The mysterious transfer student in ''SaitamaChainsawShoujo'' seems pretty unfazed when she encounters the blood-drenched, murderous protagonist... complete with [[spoiler:giggling and smirking while throwing her "boyfriend" towards Fumio's chainsaw]].
* Haruna Niekawa from ''{{Durarara}}'' [[spoiler: Though it's mainly due to her being possessed by a {{Yandere}} LivingWeapon.]]
* Ryuuko Kounuma from ''WolfenCrest''. She seems nice enough, is rather charming and carefree... Except she is completely psychotic underneath. Having spent several years under the sexual abuse coming from her dad and her pimp, she deals with it by having sex with lots of men and ruin their lives ruined afterwards, to an insane extent. She doesn't fit the Emotionless description, though, as she's pretty much AxCrazy.
* Nui Harime of ''Anime/KillLaKill'' fits this trope like a specially tailored suit. She's cute as a bug, [[ElegantGothicLolita dresses in fashionable sweet Lolita]], [[PerpetualSmiler and always wears a big smile on her face]]. She also moves with LimitedAnimation, can reach through a SplitScreen and possesses uncanny strength and speed. She also does whatever the hell she wants, [[CuteAndPsycho and greatly enjoys the sight of carnage, especially if she's the one causing it.]]
* Discussed in ''Manga/AttackOnTitan''. Eren Yeager accuses SchoolIdol Krista Lenz of being one, stating he always found her false perfection incredibly creepy. While not quite a murderous psychopath, when she isn't pretending to be TheIngenue, she can be incredibly callous about the lives of her comrades and even admits she doesn't really [[LackOfEmpathy understand]] the feelings of other people. She's getting ''better'', though, and learning to be a real person.
* Kyoko of ''LightNovel/IsThisAZombie'', an old friend of Orito, and the only survivor of an attack by the same serial killer who murdered the protaganist, Ayumu. [[spoiler:She survived because she ''is'' the serial killer who murdered Ayumu, and she's murdering people so she can collect their souls to earn more than one life, effectively making her immortal. She's also actually a [[MagicalGirl Magical Garment Girl]], and was modifying Orito's memories to make him think they've been friends since childhood.]]
[[/folder]]

[[folder: Comic Books ]]
* In ''Comicbook/{{X-Men}}'', the seductive Foxx turns out to be the shapeshifter Mystique trying to seduce Gambit away from Rogue. A similar plot occurred in ''X-Men Evolution'', when [[spoiler: Rogue's friend Risty Wilde turns out to be Mystique spying on/stalking her adoptive daughter.]]
[[/folder]]

[[folder: Film ]]
* In ''BasicInstinct'', Sharon Stone's character Catherine Tramell is this. She is a beautiful, wealthy, brilliant [[MostWritersAreWriters author]] but embodies this trope [[spoiler:with her fondness for ice picks]]
* [[spoiler:Alice]] from ''Transformers: RevengeOfTheFallen''. She looks like a hot blonde who can't keep her hands off Sam, but [[spoiler: she's actually a Decepticon who's after the Allspark info in Sam's brain]].
* [[spoiler: Liz]] in ''TheHole''.
* [[spoiler:Marybeth]] from ''TheFaculty''.
* [[spoiler:Gwen]] in ''SkyHigh''.
* ''Film/JennifersBody''.
* Asami in ''{{Audition}}'' seems like the girl of your dreams. However, when she asks you to love only her, '''[[{{Yandere}} she means it]]'''.
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[[folder: Literature ]]
* Tammy manages to conceal the fact that she's the high priestess of a cult trying to bring about the end of the world, and the one responsible for the [[ZombieApocalypse plague of zombies]] in "Gil's All Fright Diner" , despite that the townsfolk (as well as the drifter two main characters) are VERY experienced with the supernatural. This may be because she uses her great female beauty to distract and manipulate all males in the book. The fact that she only has one cultist to aid her (her would-be boyfriend) and is a teenager probably doesn't hurt, either.
* In ''PercyJacksonAndTheOlympians'' book 4, Percy starts off the book by meeting Kelli and Tammi, two beautiful cheerleaders. They later turn out to be monsters concealed by the Mist, and they try to kill Percy. Oh, and they're also part of Kronos' army.
* In the ''{{Uglies}}'' series, the "Specials" are essentially this: Tally describes them as being very beautiful, but a mean, threatening kind of pretty.
[[/folder]]

[[folder: Live Action TV ]]
* Subverted on ''Series/NedsDeclassifiedSchoolSurvivalGuide'' with May, June, and Julie, the "Stepford Schoolgirls". Moze becomes convinced that the three girls are robots, but they're not; there's a perfectly logical (read: [[AssPull badly executed]]) explanation for everything.
* Kuroki Mio in ''Series/PrettyGuardianSailorMoon''.
* Debbie Berwick (self-described Cupcake Queen of the Universe) in ''Series/PhilOfTheFuture'' [[spoiler:is an evil robot.]] But until the "Halloween" episode, only Pim seems to see it.
* Ingrid from ''YoungDracula'', though it takes a major WeirdnessCensor on the part of everyone else not to notice.
* Darla from ''Series/{{Buffy|the Vampire Slayer}}'' makes her introduction as one of these in the first episode.
[[/folder]]

[[folder: Video Games ]]
* In an old text game you met a woman whose figure was described, to begin with, as "impossible" or "implausible". And you could sleep with her if you wanted, but then she turned out to be a monster that fed on LifeEnergy and you get a NonStandardGameOver.
* ''{{Tsukihime}}'', a stand-out VisualNovel, can feature more than one of these depending on the route you take. The stand-out example, however, is Kohaku. On first appearance she's the one ray of cheerful {{Meido}}-shaped sunshine in an otherwise cold and unwelcoming BigFancyHouse; but delve into the [[MultipleEndings Far Side routes]], and when you see her [[NightmareFuel real smile]]... [[BowelBreakingBricks eep]].
* Orianna, the Lady of Clockwork from ''LeagueOfLegends'' is an example of a girl who approaches the UncannyValley from the ''other'' side. A clockwork-powered automaton in the shape of a beautiful girl, Orianna was created as a ReplacementGoldfish by a genius clockmaker who never got over the death of his daughter. Unfortunately his creation ended up as something described as a "clockwork killing machine". While Orianna could never be mistaken for a human, she believes herself to be alive and tries her best to act in a manner she perceives as "normal"- except she has a very skewed perception of what "normal" is. As a result she's described as being far more creepy than the League's other robot, who doesn't even look SLIGHTLY human beyond his basic shape.
-->This thing seemed dead inside. It seemed like an automaton, trying to act like as if it was alive. The effect was unsettling.
-->It's not that she didn't have facial expressions – they were just wrong. There was something in everything she did that was just a little bit off, off enough to be just this side of completely alien.
[[/folder]]

[[folder: Web Comics ]]
* You wouldn't believe it from [[PsychoForHire how she acts]] around the other protagonists (so it's not exactly a straight example), but [[PerspectiveFlip from the perspective of her schoolmates]], Mell Kelly of ''{{Narbonic}}'' would probably count as one of these, since when she's at college she puts up a façade of quiet sweetness, as seen in the "Mell Expelled" storyline.
[[/folder]]

[[folder: Western Animation ]]
* In the episode of ''WesternAnimation/{{WITCH}}'' "T is for Trauma", BigBad Nerissa disguises herself as the beautiful Stacie, showing up at Sheffield Institute in order to lure the heroines' boyfriends away and to spy on them. In addition to being beautiful, she uses a spell to make every guy in school completely crazy for her (except Will's boyfriend Matt, who was immune because Nerissa had already messed with him).
* ''InvaderZim'' could be seen as a subversion of that trope, except that he's not a girl. Tak (who ''is'' a girl) is a somewhat straighter example.
* In ''TheOblongs'', Milo gets a crush on an alien who infiltrates not only his school but also the Debbies' clique, despite her PaperThinDisguise.
* As mentioned, [[spoiler: Risty aka Mystique]] in ''XMenEvolution''.
* In Ben10UltimateAlien, [[spoiler:Elena Validus]] becomes this after [[spoiler:the Hive infected her and turned her into a {{Yandere}} for Ben.]]
[[/folder]]

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