Massacre of Freddy's* is my FNaF AU (a non-existent game—don't try to find it!) featuring a completely altered storyline. My inspirations were:

A Hell in Freddy's: https://gamejolt.com/games/THIFREVENGEANCE2/1017142

Trtf: Dreadful Truth

The Incident at Freddy's: https://five-nights-at-freddys-fanon.fandom.com/wiki/That_Incident_at_Freddy%27s