Kaito

Kaito is a warrior who was born with only a little piece of power; as small as an atom, though being the son of the strongest man in the universe, Kenshin Hakusai. Years later, He develops a technique from a shinigami named, Yuna; called "Willpower". Willpower is a technique that increases your stats immensely by the power of will and sacrifice. But, since he is accompanied by the shinigami of willpower, he is given the full power of an exorcist,which lives in his left arm. Seraphim, Story: You are Kaitos older brother, Ryuji. You have to save him from the corruption of the Seven heavenly virtues. Ryuji has demon powers and kaito has seraphim powers.