You're Evan Afton. The youngest member of the Afton family. The Afton family is a very unique family. You were all brutally killed or became something non-human in different ways and are now possessing robots that your dad (William Afton) has made and killed by

William Afton (Now called Springtrap) is making some random Jimmy Neutron looking invention (Has immortality and great intelligence)

Clara Afton (Now called Ballora) is cleaning the house (Has immortality and great hearing)

Elizabeth Afton (Now called Circus Baby) is eating (Has immortality and a built in claw)

Michael Afton (Still Michael) is doing work. (Has immortality)

Say what you're (Evan Afton but now called Golden Freddy) doing (You have, immortality, teleportation, limb detachment, electricity manipulation and flight

I'll give some info here: You were bullied when you were a human kid by your older brother (Michael). But somewhere in 1983, he put you in the jaws in one of your father's animatronic creations as a prank. Unfortunately, the jaws closed, biting and crushing your frontal lobe and killing you but your soul possessed the robot. William built an animatronic named "Circus Baby" based off his daughter, Elizabeth. But once Elizabeth got too close to Circus Baby, it killed her and her soul possessed the robot. William built a ballerina type animatronic (Ballora) to represent their wife, Clara Afton. But YET AGAIN, the systems crashed and so it killed her and the soul possessed the robot. William was cornered by enraged ghosts of his past, in a quick act to protect himself, climbed into a yellow animatronic rabbit that could also be used as a suit. But he forgot to wind the springlocks so after a few seconds, it went off and after a long hell inducing pain, merged with the suit. Michael got tricked trying to free Elizabeth, and got scooped by a giant ice cream scooper basically, and now is a rotting purple human corpse. (Everyone mentioned (Except Michael) are now robots. Not humans. But still do human activities