Juubei Yagyuu

Muneakira's first master samurai, with the contractual mark on her chest. She also has a power level of five million when she transforms, but in this state she has shown a sadistic side, yet she is an honourable warrior who gives respect to those whom have earned it. In her normal form however, she has no memories of her former life, and has an obsession with her "onii-chan" (big brother), Muneakira. She is also airheaded, innocent, and acts very much like a child, which is reinforced by the fact that she refers to herself in third-person. Her weapon is a daisho set, with the katana unusually colored.

(Source: Wikipedia)