Koshirou Chikuma

Koshirō Chikuma (筑摩 小四郎, Chikuma Koshirō) is a member of the Iga Tsubagakure clan who is one of the ten ninja picked by Ogen to participate in the battle against the Kōga, the childhood friend of Oboro and the apprentice of Tenzen Yakushiji.