Shichiroji

シチロージ

Kambei's "right hand man." Kambei and Shichiroji fought side by side in the Great War, which is why they have become the best of friends. He temporarily abandons his successful post-war business, along with his "girlfriend," to join Kambei in battle once again.
Unlike the other samurai, Shichiroji uses a kamayari instead of the katana used by the others. He has a prosthetic left hand equipped with a grappling hook.
He is often nicknamed Momotaro, after the traditional Japanese tale, because he was found by his girlfriend, Yukino, badly injured after a battle, floating down a river inside a capsule reminiscent of a peach.

Spoiler