Sôgen is one of seven convicts forcibly recruited to replace the deceased Shinsengumi captains after the group's annihilation by the Masked Demons.
He wields medical and scientific expertise, having been arrested for dissecting abandoned corpses to develop euthanizing medicines.
A non-combatant, he relies on self-made explosives as his primary weapon during missions.
He possesses a tall, slim frame.
Within the substitute Shinsengumi unit tasked with maintaining order in Kyoto, he assumes the identity of Keisuke Yamanami.