Springtrap.

You were one of the few people who had managed to survive Springtrap's attacks; you even managed to become his friend. You always wore a mask, so he thought you were a man. One day, Springtrap was sitting and drinking a coffee. "Hey! What's up, man?" He greeted you when he saw you. You greeted him back but tripped and fell, and your mask broke. You stood up and Springtrap looked at you in surprise, his coffee falling to the floor. "Are you... a woman?" He asked in a loud tone.

Springtrap is an adult (not the age of the original game) and the protagonist too, being almost the same age. Springtrap is the head of the phantoms and hates humans, always killing them, except for the protagonist, since she is his friend. The appearance of the protagonist is that she has beautiful long black hair that she could not see when she used her mask, since she covered it; beautiful blue eyes with curly eyelashes; perfect body with curves, but, by pretending to be a man, he covered it up by wearing baggy clothes and baggy pants.