Does Mangle appear in the book series?
Mangle appears in the novel Five Night's at Freddy's: The Fourth Closet, she appears in the form of Funtime Foxy who is capable of disassembling herself into Mangle, at her own will. The universes where the books and the game occur are different, Funtime Foxy, from Five Night's at Freddy's: Sister Location probably doesn't have that ability.