Freddy Fazbear is the main antagonist and eponymous character of Five Nights at Freddy's. He is an animatronic bear who is left in a "free-roaming mode" at night, during which he wanders around Freddy Fazbear's Pizza, along with the other animatronics, until 6 AM.
He forcefully stuffs any human he encounters after-hours into a Freddy Fazbear suit, as do the other animatronics, resulting in said person's death.
Freddy is an animatronic wearing a costume that gives him the appearance of a brown bear. Onstage, he wears a black top hat and bow tie, while wielding a microphone in his right paw. His ears are articulated and are thus able to move back and forth.
He has human handprints on his face (see picture below), though they are difficult to locate. His irises are normally of a light blue color, but he is commonly seen with his endoskeleton eyes on-camera, rather than his normal costume eyes.
Freddy starts the night on the Show Stage, along with his bandmatesBonnie and Chica. Upon activation, he will follow a set path from the Show Stage to The Office. The path is as follows: Show Stage → Dining Area → Restrooms → Kitchen → East Hall → East Hall Corner → The Office.
Unlike the other animatronics, he will remain in dark areas of the room he is occupying, leaving only his eyes and parts of his face visible. This implies that Freddy is avoiding the cameras as much as possible or, as Phone Guy states, this may just be due to the fact that Freddy is more active in the dark.
Freddy will not be visible if another animatronic is in the same room as him. Viewing Freddy on the security cameras will slow him on his path, even if he is not visible in the room due to Bonnie or Chica's presence.
Freddy will play his jingle either when he is in the Kitchen, where he is not visible as that room's camera is disabled, or in The Office when the power is out and the player has no means of warding him off.
For the first two nights of the week, Freddy is inactive and stays on-stage, looking at the camera intermittently. During those nights, he only becomes active if the player runs out of power.After the power goes out and the player spends some seconds in the dimly-lit Office, Freddy Fazbear's face will show up in left doorway, illuminated and shimmering, accompanied by his music box jingle. After several seconds, the remaining lights of The Office and Freddy's face will flicker and turn off, turning the room completely dark (in addition, Freddy's march will stop as well). Being initially not visible (yet sometimes audible due to his footsteps) Freddy will approach to the player and jumpscare the player, resulting in a game over.