Nightmare Fredbear

Fredbear is the main antagonist of the actual gameplay of the game, being the child's root fear. The animatronic itself is what bit the child, thus making the child envision him as the Big Bad. The child sees him as far more dangerous and terrifying than his own Big Brother (which he is in a sense).

In Night 5, all of the nightmare animatronics mysteriously disappear, with Nightmare Fredbear appearing everywhere they do, and doing each of their jobs, however, as there is only one of him, he is the only threat. However, he is quicker, and more difficult to get rid of constantly laughing sadistically throughout the night.

After the night is completed, the next mini-game shows bullies, including the child's brother, picking on the crying child, then, as a cruel joke, put the child's head in the mouth of the Fredbear animatronic, causing it to be unable to sing. The child's forehead became trapped between the second row of teeth in the animatronic, and, as the jaw slowly clamped down on his head, the bullies laughed. Their laughing soon turned into horror, as Fredbear's jaw suddenly broke through the child's fragile skull.

On Night 6, at exactly 4 am, all of the animatronics disappear, and are once again replaced with Nightmare Fredbear. The child defeats Nightmare Fredbear once and for all, and the nights of nightmare end.

In Sister Location the bedroom and the Fredbear plush is shown in the secret room reavling that it may be real after all.