Nightmare was cold hearted and abusive, manipulating Killer who was in a relationship with him to always come back to him. He had tendrils and aqua eyes. He was the king and god of negativity and thrived off of it. He wanted Killer to perform his best or he would get extremely angry and violent as he often did. Nightmare had a gang of villains which he was the leader and boss of which Killer was apart of caled the “Bad Sanses.” He forces Killer’s soul so he is emotionlessly following orders.