Please don't list this on a work's page as a trope. Examples can go on the work's YMMV tab.
Nightmare Fuel: Kingdom Hearts coded
Sora's Heartless is somewhat disturbing, considering how nice Sora himself is.
The data version of Castle Oblivion is in some ways even more disconcerting than it was in its original form, because the illusions don't actually work on Data-Sora
In Agrabah, Jafar gets a hold of a glitch-created copy of Genie's lamp, and promptly uses it to freeze time. Data-Sora then has to race against time in a monochrome-green, almost completely silent Agrabah.