Cassidy/Golden Freddy, is a vengeful and mysterious animatronic that holds an immense amount of hatred towards William Afton, this led to Cassidy attaching herself to William's soul to ensure that he can't die. It's implied that she created the pizzeria and the animatronics in Ultimate Custom Night as a way to torture him for all eternity for his actions. Her hatred seems to be so immense that she refuses to rest like the other souls, as shown in Yellowbear's cutscene in Ultimate Custom Night, t