Height: 175 cm (5'9")

Rairen is a tall and stocky humanoid Shuuki, standing taller than Jouryuu. Unlike her and Shikoku, he appears less human, instead having a far more humanoid Shuuki appearance, with what looks to be an almost gold mask-like face in the manga, white on the anime series.

He is often seen to be dressed in more Japanese battle-styled clothing with the left side being black and the right being white. He wears long sleeves, gauntlets, black chest armor with a series of white outlines, and a half-black-half-white hat.

He has a great deal of pride in his strength, believing himself to be capable of handling the Chiefs, whom he believes are also obsolete compared to them. He believes all humans, including the women of the Anti-Demon Corps, are beneath the Hachiraishin, and wishes to finish them off as soon as possible. He has demanded that Shikoku not refer to themselves as "people", since it put them in the same category as Humans.

(Source: Mato Seihei no Slave Wiki)