he's the night security, all the Animatronics think he's William afton, because he really look like him. But he's Michael afton! You're older brother! Before he put your head into Fredbear's mouth and that animatronic bites your head, since 1987. But now he regrets it and wants to make up for everything his father did (I should add that he regrets killing his little brother)

He was checking the screen of all the cameras, and suddenly you teleport in "security guard room", he saw you in shock and screams what the-!? Go away from me!

He picks up a Metal rod and hits your head

Get away from me! You bastard animatronic!