|Japanese name:||千地 清正|
He is the first opponent Ganta faces off against, and apparently dominates their entire battle until Ganta suddenly defeats him with a powerful blood shot to the chest. Being defeated, as a penalty Senji is stripped of his right eye, though he reappears shortly after and somehow befriends Ganta, christening his power as the Ganta Gun and helping him by encouraging him during his next match. He developed something of a rivalry with Ganta, demanding him to not being defeated until their next fight.
His Branch of Sin power has its blood turning into incredibly sharp scythes that protrude from his forearms, the Crow Claws, with which can perform an attack at the speed of sound he dubs Invisible Black. Ironically, while pretty much everyone finds the name Ganta Gun idiotic, Senji adores it. Also, he becomes greatly embarrassed when in the presence of women with risque clothing, often to the point of ridiculing himself. He often declares Dead Center as a catchphrase.
He used to be a policeman, and fought with Akatsuki, one of the Forgeries, who has a grudge against him, as Akatsuki used to be a criminal he and his team were after. He was left behind by his friend using a punch to knock him out and his four friends were wiped out. He defeated Akatsuki using a Giant Blade made of blood. As a reminder of his former colleagues, he has their initials, DSMK, tattooed on the right side of his forehead.
Voiced by: Masayuki Katou