Enki

One of Raizen's old friends, Enki is slightly slow-witted but amazingly powerful. He wins the demon world tournament and becomes the sole king of demon world, defeating Mukuro after she expended most of her power fighting Natsumi, another one of Raizen's old friends. As king he declares that another tournament will be held in 3 years to decide his successor and that he will not allow any mischief in human world during his tenure, as a tribute to Raizen. As a result the barrier between the worlds is brought down, allowing demons free passage to human world, even though they cannot do any harm there. He is married to Koko, another one of Raizen's old friends.