Enki  

, 煙鬼

Enki was one of Raizen's close companions who possessed both strength and a slight lack of intelligence. Despite this, he emerged victorious in the demon realm tournament and ascended to become its sole ruler after defeating Mukuro, who had expended most of her power fighting Natsumi, another friend of Raizen. As king, Enki declared that another tournament would be held three years later to determine his successor and pledged not to permit any mischief in the human realm during his reign as a tribute to Raizen. Consequently, the boundary between the worlds was lifted, enabling demons to roam freely into the human domain, although they were prohibited from causing harm there. Enki married Koko, another friend of Raizen.