William Afton

Purple Guy (also known as Purple Man and The Murderer) is the fan-given name for a recurring character in both Five Nights at Freddy's 2 and 3.

He was the murderer of the five missing children mentioned in the first game, but could have possibly killed more, as seen from the minigames in the second game. He only appears in some of the Death Minigames of the second game and the Minigames of the third game, but his role in the story is pivotal.

Ssenmodnar 10 (350k apocalypse special)
He only appeared in this video so far, where he sings the color Purple, but Chica beats him up.