[[quoteright:350:[[VideoGame/KingdomHearts3DDreamDropDistance http://static.tvtropes.org/pmwiki/pub/images/Master_Xehanort_3D_634.png]]]]
[[caption-width-right:350: [[LargeHam FEEL]] [[TheCorruption THE]] [[CastingAShadow DARKNESS]]!]]
%% The page image might have been referenced below with "see above", or "see the above image". Just keep that in mind. %%

Ahh, ''KingdomHearts'', you have it all: your own page for [[Awesome/KingdomHearts awesome moments]], [[SugarWiki/AwesomeMusic great soundtrack]], [[ThatOneBoss/KingdomHearts a variety of hard bosses]], and .... what's missing?

Oh, a page for NightmareFuel.

What else did you expect from NightmareFuel/{{Disney}} ''[[JustForFun/XMeetsY and]]'' [[NightmareFuel/FinalFantasy Square]]?
!!Games with their own pages:
* NightmareFuel/KingdomHeartsI
* NightmareFuel/KingdomHeartsChainOfMemories
* NightmareFuel/KingdomHeartsII
* NightmareFuel/KingdomHearts358DaysOver2
* NightmareFuel/KingdomHeartsCoded
* NightmareFuel/KingdomHeartsBirthBySleep
* NightmareFuel/KingdomHearts3DDreamDropDistance
* NightmareFuel/KingdomHeartsX
!!In General
* The Japanese version of Axel's kamikaze death was bad enough that it had to be censored for Western audience. Axel's element is fire, so he essentially burned himself alive.
** Similarly, [[spoiler:Axel]] executing a kneeling Vexen from behind after Vexen begged him to stop in Chain of Memories could be upsetting. The modifications made to that scene in Re:Chain of Memories made it even worse by immolating him on-screen as Sora watched in horror.
** Zexion's death, like Vexen's, was made much more horrifying in Re:Chain of Memories. Instead of having the life drained out of him off-screen, [[spoiler:Riku-Replica]] holds him by the collar as he begs for his life, and the camera watches from behind as he stops resisting and his feet are left to dangle lifelessly.
** Larxene's death isn't as graphic, but when she realizes she's fading away, she starts desperately grabbing at the pieces of her being, trying to keep them in. It may be worse in the Japanese version because her voice actor sounds absolutely terrified while it's happening.
** Xehanort/Rikunort stabs Lexaeus in the stomach to murder him post Riku/Lexaeus battle. Not only is this change MUCH different than the previous version (GBA CoM Lexaeus basically sets his own darkness loose)Lexaeus was no longer a threat to Riku at that point. Rikunort went out of his way to do this. And the only other person this has happened to? MASTER ERAQUS.
** Nobodies, despite all their claims to feel nothing, often seem as if they actually do have emotions, but only negative ones, such as anger and fear. [[spoiler:[[KingdomHearts3D It turns out, THEY ALL HAD HEARTS.]]]]
* Neoshadows, more powerful version of [[TheGoomba Shadows]], made their debut in - SequelHook trailers aside - the Japan-only updated re-release of the first KH game. While their Chain Of Memories and Kingdom Hearts II counterparts behave like regular enemies, their original selfs are more cunning, as they actually plan during battle. One of their most unsettling tactics involves a Neoshadow pinning Sora down while the others [[NoHoldsBarredBeatdown do the rest.]]
* Some of the little details in the way dying or pained characters are animated are pretty upsetting upon closer inspection. Among the worst include Roxas involuntarily twitching as Ansem-Riku choked him into unconsciousness, Zexion's feet swaying around like a hanged man's as the life was drained out of him, Riku-Replica looking very much like [[DiesWideOpen a corpse]] when his heart was broken, and [[spoiler: Master Eraqus falling forward towards the camera with unblinking eyes when he was killed]] in Birth By Sleep.
* Deep Jungle was a peculiar case when its villain deaths are taken into account. Sabor's final confrontation ends with the leopard struggling to to both stand and see, and then the cat just sort of, gives up and dies, earning you one of its teeth as a trophy. The boss against Clayton ends similarly, only this time it's the Stealth Sneak, and then it's full weight crushes Clayton, who still had some of his sense of self left, and they both disappear together.
* There's a section in the End of the World called the World Terminus. You go through, fighting through small sections of the other worlds in the game, all familar areas (The Third District, Rabbit Hole, Agrabah etc). Then you come to Hollow Bastion, and access what is implied to be the freak-lab where most of the OriginalGeneration villains' StartOfDarkness happened. Just for context, [[http://www.youtube.com/watch?v=sZV9jufp2r8&feature=related here's a Let's Play showing said lab.]]
** Other frightening locations include The Heartless Manufactory and the secret basement laboratory operated by Xehanort and his fellow apprentices. The Manufactory is a location in ''Kingdom Hearts II'' where [[Film/{{Tron}} the MCP]] starts mass producing Heartless in order to invade Radiant Garden, and is also, according to [=KH3D=] [[spoiler: the place some of the original members of the Organization lost their hearts.]] The basement laboratory [[http://www.youtube.com/watch?v=07QVAmLPv_w&feature=player_detailpage#t=180s contains a prison-like area in which the doors are chained shut]], which is implied to be where Xehanort's human test subjects were held, as well as the Chamber of Repose, in which [[spoiler: Aqua's armor is placed.]] Xemnas is not to be disturbed while he is down there, under any circumstances.
* BonusBoss, [[VideoGame/FinalFantasyVII Sephiroth]]'s UnflinchingWalk towards Sora makes him quite intimidating, since it implies he doesn't see the latter as a threat to him in the slightest.
** He returns as a BonusBoss in ''VideoGame/KingdomHeartsII''. He's no better the second time.
* Many of The Disney Villains can still be Nightmare Fuel when you fight against them, like Giant Ursula, Maleficent in her Dragon form and others. Just cause you've gotten older doesn't mean they still can't scare you like they did when you were a kid!
* Not that this needs to be said, as he's the image for this page, but Master Xehanort. Literally everything about Master Xehanort.
* A small manner of nightmare fuel, but nightmare fuel all the same: in the first game, one of the first worlds you come across is Tarzanís, Deep Jungle. The final boss fight against Clayton and an invisible Heartless commences. The Stealth Sneak is a giant, bipedal lizard-like Heartless that can render itself completely and utterly invisible. Itís unsettling to think that a Stealth Sneak could essentially sneak up on you and starting beating you to death and you would never know how big it really was or even what it was, unless you managed to retaliate just enough to knock the sense out of it and render its camouflage useless. Creepy.