川神 百代

The "older sister" of the Kazama Family, and one of the last members to join. Momoyo did not join the group on her own, but was more "contracted" in when a group of older kids started beating up  Yamato & Co back when they were in elementary school. Yamato asked Momoyo to join and help them, and she agreed to do so on the condition that Yamato become her eternal underling. Having been together since then, they have developed a brother-sister type of relationship.

As one of the main ******es of the story, Momoyo is the heir to the Kawakami Ryuu style of kenpo, and so far remains undefeated. Her daily life includes answering challenges, taking cute girls out to lunch, borrowing money from people due to her own unwillingness to get a part-time job, and (of course) training. Despite the constant passes she makes at other girls, she claims to be straight; she often mentions that she simply hasn't met a man that interests her.

Momoyo, for lack of better words, loves to fight. It is the only thing in life that she finds true joy in. This is a side of herself that she struggles with as the story moves forward, made worse by the lack of competent challengers that come to fight her. She's even made something of a reputation for herself due to winning all fights with one punch. It has gotten to the point that the other members of the Kawakami Ryuu believe that she needs to find something else to focus on outside of fighting, or she could permanently become akin to a berzerker.

Momoyo's focus on fighting, combined with the way she normally looks at the protagonist (as her underling/little brother instead of a potential love interest) becomes an obstacle for Yamato once he decides that he wants to get together with her. Interestingly, he manages to woo her by defeating her in combat (though indirectly)./

Momoyo's virtue of Bushido is Makoto (Honesty, or 誠).