Touma Seisou (草壁=刀魔, Seisō Tōma) is a Sentōkijin (戦闘機人, "Combat Cyborg"), a cybernetic organism that combines living and mechanical body parts (i.e. an organism that has both artificial and natural systems) and is specifically designed for battle, before being bestowed with Shinigami powers. Prideful and boastful, he is proud of his power. While he acts awkward and shy to gain the trust of those around him, his true persona is that of a super-serious, highly rude and manipulative loner who is coldly dedicated to his mission. He is attempting to awaken the Ram Tenjōgekido, believing that its powers can be used to save the life of his best friend.