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FNaF.Undertale is a crossover AU between Five Nights at Freddy's, FNaF World, Sister Location and Undertale. The AU is created by Child-of-Sun-Flowers on DeviantART.


The story follows the same idea as Undertale but most of the characters are a mix between their FNaF character and the Undertale character they replace. In this the locations are also replaced with other locations, for example; Waterfall is the Painted Falls and Hotland is Underland.


Here is a list of which Undertale character is replaced with which FNaF character.

Main characters

Minor roles


  • A comic was planned for this AU but it later got cancelled.
  • Originally William Afton took the role of Asriel.
  • The creator of the AU ships Baby (Sans) and Mangle (Alphys) instead of Toy Chica (Undyne) and Mangle (Alphys), this was also supposed to be shown in the comic.


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