William’s perspective Chapter zero:

... another day at Freddy Fazbear's. Nobody even CARES that I lost my children, they just laugh and play with theirs. It's not fair at ALL, so today I decided "it's time to take action". I drive up to Freddy Fazbear's and I see a little girl with a green band, I murder her. It makes me feel good, then I see the puppet walking to the door so I run off. The next day I dress up in a yellow bunny suit I made then I lead some DUMB kids into parts n service, then I murdered them and stuffed them into suits like: Bonnie,Freddy,Chica and the Fox. Later that night I dance to the song That their forced to play FOREVER, it feels good.