In the FNAF universe, "him" is a female pronoun.
- Charlie Emily's death is first depicted in FNAF 2's SAVEHIM minigame. The garbled robotic voice calls the kid a HIM. But FFPS revealed that Charlie is a girl.
- Also in FNAF 2, Phone Guy calls Mangle a him. But Mangle has a pretty feminine appearance, so what's up with that?
- In UCN, Withered Chica proclaims, "I have seen him. The one you should not have killed." But wait, isn't TOYSNHK Cassidy? She's a girl, so how can she be a him?
There's only one logical explanation to all of this. In the FNAF universe, the pronoun "him" refers to girls.