Five nights with Four.

Four - He has blue hair and blue eyes, he has a friend. His friend's name is X, and he has an enemy named Two. He is a bit arrogant, moderately rude and humorous, and quite cruel. He attacks from both doors. He wears a gray tailcoat with a black tie. He also wears black trousers.
Two - He has green hair and green eyes. He's friendly and optimistic (well, that's for the animatronics!), but he can sometimes be arrogant and sadistic. He also has an enemy, his name is Four. He attacks from the left door. He wears a tailcoat and dark green trousers.
X - He has yellow hair and yellow eyes, and he has a friend named Four. He's sweet, kind, appreciative, forgiving, friendly, and good (this also applies to the animatronics, but he can sometimes help the guard, but only occasionally!) He attacks from the right door. He wears a brown jacket and gray pants.
One - She has cornflower-blue hair and cornflower-blue eyes. She wears a dark blue vest with a white bow tie and a blue skirt. She's quiet, calm, and manipulative. She may act kind, but... But in reality, she wants to catch the guard, so she's also cunning and malicious. And they simply ignore her as if she doesn't exist, so she has no friends. She attacks from both doors and the ventilation system.
Three - She has red hair and red eyes. She wears a red and white sweater with a gray jumpsuit over it. She's friendly, caring, and energetic. (But that's also true for animatronics!) She only attacks in the vents.