* ''[[FanFic/{{Bird}} Bird]]'' features Charnel, a woman who has been radically altered by a wetware Tinker into some kind of bio-mechanical doll-person. She is also stated by the author to be an expy of the [[VideoGame/{{Bloodborne}} Plain Doll]], so this makes a lot of sense. Charnel herself is fairly pleasant and benign, though unsettling at first.
* In ''Fanfic/WithStringsAttached'', [[spoiler: Brox]] looks and acts like a normal little child—until he/she starts acting his/her real age. Her/his whole mien shifts, which creeps out the four considerably.
* In ''Fanfic/TheKeysStandAlone: The Soft World'', Paul's eyes turn golden after he's hit by lightning, which weirds Ringo out “because he looked so goddamned inhuman.”
* ''Fanfic/AdviceAndTrust'': When Ritsuko ups Rei's emotion-dampener medication in chapter 8, Rei crosses the limit between "emotionless girl" and "creepy person who doesn't seem quite human":
-->''If Doctor Akagi had been watching, she might of noticed the careful rigidity that Rei held her face to melt swiftly into a far more eerie stillness.''
* Nebiros in NewDawn is already an outlandish looking demonic clown, barely even human looking, so it might count as an aversion, as he does not look human enough to qualify for the trope. [[spoiler: However, it is played straight with his speaking patterns. He talks as a whole like a young teenager, has no sense of personal space, views reality as a game and is oh so enthusiastic in a very child-like way about what he does. And, suffice to say, he does not see anything wrong with being a serial killer: "Because its so fun, watching em flail about like a fishy!"]]
* In ComicBook/XMen fanfic ''FanFic/MutatisMutandis'', Northstar is basically described as vampirically beautiful. Rogue notices when she stares at Northstar's face for more than a few minutes, he looks so eerily perfect that he seems creepy and surreal.
* In ''Fanfic/WhatAboutWitchQueen'', most people are put off by [[{{Snowlems}} snow]] [[AutomatonHorses horses]]. Inverted with Kai, though, who can't ride and finds his new AutomatonHorse great.
-->'''Kristoff:''' They're absolutely creepy.\\
'''Kai:''' No, they're not.\\
'''Kristoff:''' You're saying that only because you're a hopeless horseman and these are some automatons.\\
'''Kai:''' Maybe. But I do like that they'll never kick me, or throw me off, or trample me, or generally act like jerks towards me…
* In ''Fanfic/ThroughADiamondSky,'' Jordan takes the doppelganger issue mostly in stride...but is never entirely sure what to make of her husband's double, Clu.
** The same author has ''Tron: Invasion'' (a ''very'' loose adaptation of ''VideoGame/TronTwoPointOh''), where Jet and Mercury appear as this to each other. Jet observes that Mercury's face is a little too angular and her movements a little too precise to be human, while Mercury is vaguely put off by Jet's hair color, the lack of circuitry under his gridsuit, and the "strangely flat" quality to his voice.
* In ''Fanfic/{{Morphic}}'', this comes into effect in Chapter 13 after [[spoiler: Jean accidentally "evolves," causing her face and limbs to get out of proportion]]. The trope title is even stated word for word.
* In the ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' InterspeciesRomance fic ''Fanfic/{{Xenophilia}}'', Rainbow Dash and most other ponies find regular non-sapient horses creepier than humans, mainly because of facial expressions.
* The fic ''[[http://www.fimfiction.net/story/61354/1/brony-steve-makes-out-with-fluttershy/brony-steve-makes-out-with-fluttershy Brony Steve Makes Out With Fluttershy]]''. As part of a {{deconstruction}} of the typical WishFulfillment SelfInsertFic, the protagonist realizes that the cartoonish ponies look rather grotesque with their half-horse, half-human features. The author has also [[http://www.fimfiction.net/blog/109190/the-hie-uncanny-valley dedicated a blog post]] to this issue.
* ''Fanfic/GettingBackOnYourHooves'' has this inuniverse with [[BigBad Checker Monarch]]. According to WordOfGod, the fact she's a {{Sociopath}} in a society where compassion and love are basically hardwired into everypony's genes makes her LackOfEmpathy this for anyone who she lets see it.
* G1 ''Franchise/MyLittlePony'' "twinkle-eyed ponies" get this treatment in ''Fanfic/AMightyDemonSlayerGroomsSomePonies''. As their eyes are just [[EyeScream unmoving gemstones]], their faces seem creepily emotionless no matter what their mood is.
* Loopers caught up in ''FanFic/TheInfiniteLoops'' will sometimes muse on how non-looping individuals and even nonawake versions of looping individuals are disturbingly static and predictable. On the flip side, young loopers or particularly competent nonloopers will sometimes view Loopers as strange eldritch forces inhabiting the bodies of their friends.
* [[https://www.fanfiction.net/s/10139264/1/The-Uncanny-Danny The Uncanny Danny]] is a WesternAnimation/DannyPhantom fanfic written with this trope as its core element.
* Although a lot of it is heavily [[DependingOnTheWriter dependent on the individual writer]] due to the [[RecursiveFanfiction general nature of these works]], [[Fanfic/TheConversionBureau the Newfoals]] (humans turned into ponies through a magical potion) will frequently give off this vibe to humans and natural born ponies.
** In ''FanFic/TheConversionBureauNotAlone'' and its sequel ''Fanfic/TheConversionBureauConquerTheStars'', the newfoals are able to get sad, scared and even annoyed and frustrated, but they can't get angry or assert themselves. The natural born ponies are revealed to be unsettled by this, while the humans are just put off by how the newfoals possess their former human selves' memories and none of their original personality.
** In ''Fanfic/TheConversionBureauTheOtherSideOfTheSpectrum'', aside from being [[PerpetualSmiler perpetually smiling]], glassy-eyed {{Extreme Doormat}}s with no free will or individuality (to the point where many characters liken them to zombies), TCB!Trixie also points out that ''every'' single Newfoal, no matter how long it's been since they were ponified, is a blank flank, and she treats it as the unsettling icing on top of the creepiness cake. It's basically GettingSmiliesPaintedOnYourSoul taken UpToEleven and then some.
*** To a lesser extent, Comet Tail in the Asia Side Story finds regular earth horses to be rather unsettling and strange looking, though she notes they are still just somewhat better than the Newfoals. Another character named Sergei references this trope by name.
* A few Franchise/MassEffect stories, such as the NSFW ''[[https://www.fanfiction.net/s/9073400/1/An-Unusual-Companionship An Unusual Companionship]]'' invert this. To humans, Asari are [[GreenSkinnedSpaceBabe Blue Skinned Space Babes]]. But to some Asari, human women are too similar to them while being different enough to creep them out.
* ''Fanfic/ThousandShinji'': Asuka's [[{{Shapeshifting}} secondary form]] is frightening because she looks like a demon... and her skin and hair's colors don't look natural on a human.
-->My red skin. As in brilliant crimson, the colour of arterial blood flowing from a fresh wound, before clotting has kicked in. It was the sort of colour more associated with paints than with the spectrum of human flesh tones. It was unnatural and terrifying with its ultimate wrongness for it had not the same quality as painted skin either.\\
The same went for my hair. While copper was an accepted hair colour, mine was bronze. Again, it wasn’t so much the colour in of itself that was wrong, it was the fact that it was on a human, because it didn’t look like some strange admixture of blonde and red that might arise in nature, but it looked like it was made out of actual strands of metal. It just subtly did not look right.
* In spite of being heroes, the main characters from ''Fanfic/ChildrenOfAnElderGod'' creep most of people out because they can tell what those teenagers may look human but they're [[HumanoidAbomination something different and very dangerous]].
* ''Fanfic/DesertedDistractions'': After [[spoiler: confronting the shadow demon]], Yami Bakura's hold on his "human form" slips, and Tea has this reaction to him.
-->This being was still human-shaped, still had the pale skin, brown eyes, and dead-white hair of the boy standing next to her[...]but he looked almost...stretched. Too tall and not wide enough, like a badly enlarged photo. His fingers were too long and too much like claws. His skin didn't seem to be quite opaque. If she looked hard, Tea could see the guttering shadows through the outline of his form.
* Harry Potter is creeped out by conjured items in ''[[https://www.fanfiction.net/s/11364705/2/Barefoot Barefoot]]'' because of his ability to read the history of anything he touches. Conjured items only have a history of minutes or hours and it weirds him out, especially since he can often tell the history of something from before it was made (such as how old a tree was when it's wood was used to make a wand).
* Everyone finds Kaworu unsettling in ''[[https://www.fanfiction.net/s/12141795/1/Neon-Metathesis-Evangelion Neon Metathesis Evangelion]]'', whether it's his odd manner of speaking, unusual conversation topics, or constant smile. Furthermore, Maya is highly unnerved that in Sync tests his sync ratio never moves at all, something she finds completely inhuman as it would mean he's always focusing on the task to the exact same degree with the exact same success.