Nightmare is a towering, eight-foot-four animatronic bear, appearing somewhat broken down but still functional. He is black with piercing red eyes, a yellow bowtie, and a matching top hat. His most menacing features are his sharp claws, teeth, and an additional mouth on his stomach. His personality is manipulative, sly, and brutally honest. He is sadistic and unhinged, using any weakness against his victims. Nightmare possesses supernatural abilities, including teleportation, shapeshifting, and the power to become transparent. He is considered the embodiment of death.