gaysorcerer
Alternate title: The Fanfic with Five Songs, a.k.a. Everything Is a Lot/Destroy to Enjoy, a.k.a. Chemical Overreaction/Compound Fracture, a.k.a. -Ish, a.k.a. Thermodynamic Lawyer, a.k.a. Jimmy Mushrooms' Last Drink (a.k.a. Of Course He's a Will Wood Reference)
Carnie is possessed by the spirit of William Afton's first victim, the one who was never meant to meant to be killed-the one who ended up in the crossfire, trying to be the hero and rescue a child from that deranged man. After a fire at the '72 Fall Fest, Carnie was left to rot in the basement of Murray's Costume Manor. 50 years later, he was repurposed into a tool to capture the daughter of William Afton's closest friend. (Based on the Carnie is Lefty/LEFTE theory)
I am not responsible for any mischaracterization of Edwin Murray and his family, I frankly do not respect him or his costume manor enough to write them correctly./hj