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Nightmare Candy (also known as Monster Candy) is a nightmare animatronic, that was created by Emil "Ace" Macko.
Unlike other characters from the Five Nights at Candy's series, this animatronic hasn't appeared in any games yet and Emil stated, that he won't use the character in any new FNaC game any time soon.
The character represents a nightmarish version of Candy, which sports an indigo coloration and yellow eyes. Its appearance seems to be heavily based on the animatronics from Scott Cawthon's Five Nights at Freddy's 4.