Two ragged animal-like animatronics from horror media that are actually possesed by a serial killer known for killing many people at their respective franchises' pizzerias (Jerry Robert Wills and William Afton), with both killers being major players in the formations of the pizzerias they murdered people in. Even before they became the animatronics themselves, they dressed up as the animatronics they would eventually become and kill people, usually by luring them in a room where there were no other people. Ever since then, they have been trapped in these animatronics, and many years later stalked the people who worked at whatever establishment there, such as the case with the FNAF 3 Night Guard and the Janitor. There's also the fact that Willy is short for William, which is Springtrap's real name.