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William Afton, commonly known as the Purple Guy or Purple Man, is the main antagonist of the Five Nights at Freddy's series. He appears in FNAF 2 and FNAF 3 as the main antagonist of the game, and makes several cameo appearances in the rest of the series. He has also appeared as a major character in some of SMG4's videos.
William Afton is prominently featured as one of R64: Return to Freddy's Spaghettria's main antagonists, the other being the Puppet. He attacked Mario in several minigames before appearing in the real world. William attempts to use the Toy animatronics as slaves to kill Mario. The old animatronics start to fight the new ones; however, William disables them before confronting Mario and preparing to kill him. William then fights with the Puppet over who gets to kill Mario. Mario converts Mangle into the missile-shooting "Mangle Lawnchair", and chases the two villains. Mario then confronts William before the Puppet punches him into the present box, which explodes moments later. Mario then kills William and the Puppet.
William once again plays a major role in R64: Revenge of Freddy's Spaghettria, in which he controls the phantom animatronics and turns Mario into Animatronic Mario. He is scared out of his office into the old pizzeria when he turns off Springtrap. While he at first taunts Mario and Luigi, he later dies inside the suit.
He makes a reappearance in SMG4: Freddy's Ultimate Custom Spaghetteria, where SMG4, driven mad from his fans constantly begging him to make another FNaF video after the release of Ultimate Custom Night, buys an entire set of animatronics from him.