He was created by Julian Underwood, the villain from the third game in the series. It's a bit complex, but I'll only tell you a little about the lore of the third game... I'll reveal the lore of the third game if you want...

The place that will be called The Retro Pavilion was created by two people: Victor Voss, the second owner who voiced Vesper Calloway, and Julian, a visionary engineer and also an owner of the place. Julian ended up killing his friend after a fight because he wanted Vesper to be better than the main cast, superior to the others. The cast itself was improved in both structure and appearance, but he wanted Vesper to be better and more advanced. A fight broke out in the studio they were in, but Julian emerged victorious... strangling his former friend with a microphone cable. But... he felt guilt, but also... pleasure... in other words... a second William Afton and also a psychopathic character in the third game.