Being the immortal fuck William Afton is, him turning into an AI computer virus just made him more powerful and gave him the Overseer status

Now he kills kids on a multiverse level part of the evil overseers

He has the powers to create glitches and spawn corrupted fnaf animatronics

His powers were sealed away one day when the evil overseers were defeated and he was sealed inside of a Youtube video marked for never to be watched