The cast of FNaF 4 consist of the Nightmare animatronics. This is also the first time human characters have a more important part of the lore, outside of William Afton and the murdered kids.
Any character in this section marked with "*" are "questionably canon" according to Scott, but they might be this way in terms of their role in the story of that game.
Any character marked with "~" is not an official given name by canon sources.
Nightmare Freddy
Nightmare Bonnie
Nightmare Chica
Nightmare Foxy
Nightmare Fredbear
Nightmare
Plushtrap
Nightmare BB
Jack-O Bonnie*
Jack-O Chica*
Nightmare Mangle*
Nightmarionne*
The Crying Child
Foxy Brother~
The Bullies~
Random Kids~
Employee~
Fredbear Plush~