Springtrap, or as some know him. William Afton. He is the main antagonist of Five Nights at Freddy's. He had killed countless kids in the past, all of which has turned into animatronics. He should sound sinister, but also like he is trying to gain our trust so we don't expect that he is behind something that has gone down. No animatronics even know who he truly is. Except Scrap Baby, Molten Freddy and Lefty.