Nightmare

Nightmare is the True Main Antagonist in Five Nights at Freddy's 4. He could be seen as the Bigger Bad of Nightmare Fredbear, as while Nightmare Fredbear serves as a nightmarish version of Fredbear in general, Nightmare serves as the specific Fredbear that bit the child's head. He replaces Nightmare Fredbear as the main antagonist on the final night, aptly named "Nightmare" (FNAF 4's 20/20/20/20 mode).

like Fredbear on Night 6, on Night 7 and Night 8, he takes the same role, appearing at 4 AM, and replacing all animatronics, taking up their duties. He must be handled the same way, but Nightmare is more aggressive than Fredbear. Also, he always directly appears at the doorway. Upon being attacked by him, he will appear in a screen similar to Golden Freddy instead of a complete animation. His existence is unexplained, and his purpose is unknown. He is acknowledged in the gallery as a separate entity from Nightmare Fredbear, meaning that he must have some sort of significance.