Reiji has very pale purple hair, it almost looks white. He has a piercing through his lower-lip and two piercings at the inner corners of his eyebrows. With a mean expression, he is often referred to as boss.
Reiji is seen wearing a dark red checkered shirt with a dark blue and red body warmer.
Reiji is a delinquent gang leader and likes troubling others. Due to his evilness he was further possessed by Astaroth, the King of Rot. He is very sadistic. In contrast with his delinquent personality, Reiji comes from a well-to-do family.
True Cross Academy arcHe is first shown shooting pigeons with a crossbow, but Rin beats him and his gang members off before they can do anymore damage. Seeking revenge, Reiji seeks out Rin the next day and leads him to an abandoned court. Rin says that he doesn't want any trouble, but after Reiji insults Rin's younger twin brother Yukio--by trying to give Rin money to help Yukio pay for his school--Rin becomes infuriated and punches Reiji. Reiji's companions grab him and press him to the floor. At this point, Reiji is already possessed by Astaroth but only begins transforming now. Reiji grows horns, sharp teeth, nails and a tail. After Astaroth threatens to hurt Rin, Shiro appears and exorcizes Astaroth, leaving Reiji's body.
Reiji is treated by his friends and when he regains consciousness, he remembers what happened and lets his emotions get the best of him, which allows Astaroth to possess him yet again. Astaroth goes to Shiro's church in Reiji's body and begins to fight the Exorcists. When he transforms into his real form, he is eventually defeated and exorcized once again. Reiji's body is injured and then treated by the Exorcists.
He also appeared in the anime's Specials (Special 10, to be exact).