The one that stands out (a fnaf fanfic)

Freddy fazbear's pizza is strange as is with a myth that the animatronics are out to kill the night guards and that they become humans after closing. but things get weirder when they receive a new animatronic from a distant sister location. now not only does the night guard have to worry about the normal ones, they have to worry about one no one has ever heard anything about.