Aside from you and the four animatronics the only other character in the game is someone referred to as Phone Guy. He calls you each night at the beginning of the level to offer advice on how to stay alive.
Except that he really doesn't. His advice is usually wrong and he claims that the player is really in no danger half the time. He even tells you to leave the room, which would probably be an instant kill. Even on the fourth night when it sounds as if the animatronics are attacking him he exhibits no real panic. The theory goes that Phone Guy is actually the animatronic Freddy Fazbear himself using the same voice box that lets him sing at shows during the day.
