Springtrap

Springtrap is one of the main antagonists of the ETQAY Saga. As the Purple Guy, he transformed Scott's Nightmare Initiative into the Nightmarification Process, which took away the day mode, allowing them to roam during the day. He's not above using mind control, joining rhe Dark Side of the Force, and, of course, killing more people. As such, he is the leader of the Nightmares.

However, it has slowly been revealed that although Springtrap is evil, he wasn't always this way, and it may even be possible to save him.