|”||Freddy Fazbear is the main antagonist in 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 a 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 bandmates Bonnie 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 competely 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 game over.
If the player "plays dead" (i.e. doesn't move while he plays his jingle), his attack may be delayed. Typically, doing this may cause Freddy to play his jingle for a longer amount of time and, when the lights completely go out, may cause him to delay his attack, giving the player a bit more time to hold out until 6 AM.
From Night 3 onward, he becomes active while the power is on. Usually, when Freddy moves, a deep laugh is heard instead of the usual footsteps the animatronics usually create when moving. Freddy only moves when the monitor is down, so, even if the player isn't directly watching him, he won't move while the cameras are being monitored.
Freddy can only enter The Office via the East Hall, with the exception of when the power has been fully drained, in which he will only enter The Office via the West Hall, specifically, the left door. As his movements do not appear to have any strict rules and are almost instantaneous, he can often appear as though he has the ability to teleport. This issue is compounded by the fact he doesn't always laugh when he moves, meaning that the player has to constantly search for him to ensure he isn't right next to The Office.
The most efficient way to prevent Freddy from sneaking into The Office is to frequently monitor the cameras in order to stall his movements. If Freddy can be seen on CAM 4B, the player should always close the door while looking at the monitor, unless the player is viewing said camera, as shown by this video. The reason for this being that, otherwise, Freddy may move inside the player's room. Freddy may sometimes move inside The Office if the player looks away from CAM 4B to monitor another camera while he is there. Since Freddy does not appear in the blind spot, his position in the East Hall Corner indicates that he is just one step away from entering The Office and ending the game.