Freddy Fazbear

Freddy Fazbear is the main antagonist of Five Nights at Freddy's, being an animatronic bear and mascot at Freddy Fazbear's Pizza where during the day, he, along with his robotic peers, are presented as child-friendly entertainers. However, during the night, when the game takes place, Freddy and his peers attack every human they see.

Role in the game
The game follows a rookie security guard who recently gained a nightshift job at Freddy Fazbear's Pizza, a very Chuckie Cheese-esque entertainment restaurant. Via a telephone call from the guard's predecessor, the guard is informed that the animatronics "wander" from 12 AM to 6 AM and will forcefully (and fatally) stuff any human they see into Freddy, as they apparently view every human as a metal exoskeleton who needs a suit. Freddy is only seen when the player runs out of power, where he eeriely stares at them from a distance in the pitch black darkness while a creepily happy tune plays in the background, before lashing out and killing them. He is also seen on the gameover screen, where two terrifying human eyes (obviously the player's) are dangling out of his sockets.

Freddy also apparently murdered the guard's predecessor, as on the forth night, you can hear the predecessor's last words being "Oh no..." as the same creepily happy tune plays before cutting off.