Big Brother (or Foxy Mask) is a major character in the Five Nights at Freddy's series, first appearing in Five Nights at Freddy's 4 as one of the game's three main antagonists alongside Nightmare Fredbear and Nightmare, serving as the primary antagonist of the mini-games. He is the protagonist's abusive older brother, and is the one who caused the child's accident.Nightmare Foxy represents him in gameplay.

Five Nights at Freddy's 4

Big Brother is only seen in the minigames, particularly on Nights 2, 3, 4, and 5. His role as the child's brother, and not his father, is revealed on Night 5.

He hates his little brother, likely due to him still being a child, and has apparently abused the child to the point of him crying all the time. Five days from the party, he locks his brother in his room, laughing sadistically from the outside. Fredbear seems unfazed by what Big Brother is doing, only asking what he has done "this time." Fredbear constantly tries to help the child avoid Big Brother, guiding him with his words.

4 days from the party, the door is unlocked, but when the child enters the TV room, he jumps out from behind the TV with a Foxy mask on, making the child fall on the floor and sob.

2 days from the party, when the child enters his bedroom, he jumps out from under the bed, causing the child to fall to the floor and cry again.

1 day from the party, Big Brother and his friends lock the child in the Parts/Services room, the child banging at the door sobbing.

On the day of the party, the child's birthday, Big Brother and his bullies, wearing the masks of Freddy, Bonnie, and Chica, surround the child tormenting him, the one in the Chica mask commenting that the child is pathetic. Big Brother suddenly gets the idea to force the child to be right next to the Fredbear animatronic, the child screaming and shouting as he is dragged over to him. Big Brother decides to force his brother's head into the animatronic, saying that it's a big kiss to Fredbear. He underestimates the strength of the mechanical jaw, only laughing with his bullies as his brother's head is stuck. The child's forehead gets stuck between the second row of teeth, and the machine overpowers his skull, crushing through and ripping out his frontal lobe, causing Big Brother and the bullies to stop laughing and look in horror.

Can you hear me? I don't know if you can hear me.....I'm sorry.
~ Big Brother apologizing in the child's last moments

After the bite, something happens which causes the child to begin to die. Big Brother comes to his little brother's bedside, and apologizes in a brief statement. He had felt remorse for what he caused, and put himself on the path to redemption. It is unknown if he is a character met in the past games, leaving his fate ambiguous.

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