His father probably experimented on him which probably caused him to become purple.

I agree with all of these comments.But i always thought of there names.I understand that in Fnaf and all the other parts we dont know there names.But i think there names are Olivr and Veronica Afton.I understand if you don't agree but i think the names fit.Also the only thing we know is that William's mother left for some reason.I always think that she died.I may not be right with anything i said and it is not proven right.But thats my thoughts :)

Oliver* :)

I just want to correct Blue sheep 2.His father did experiment him but that did not cause him to be purple.Him dying in the springlock suit caused his skin to rot and then it became purple. :')

Yea, i didnt know if he was serious by saying that his dad experimented on him. and also a reply to the main comment, william afton caused all of his children to die, micheal died because of W afton, he killed his wife, and "evan" afton died because of W. afton. he caused it all by himself.

I don't think if william's dad is abusive cuz its not shown in the game on fnaf

I take back everything I said before

I doubt that William had a bad past, even if he did why would it matter, given the monster he is

And Midnight Motorist was with him, BV, and Micheal