Momoko is a strange and hyperactive young girl who is also a martial artist in a special form of martial arts that only members of the twelve Zodiac Masters of Japan can learn. She is associated with the dragon of the Chinese zodiac. She wants to become Kōshi's bride in order to produce a strong son with him, as her father told her that since she is a female, she is currently unable to master her family's martial arts techniques effectively. Momoko shares a strange relationship with Kōshi which has been compared to that of a dog and its master in the series itself. Momoko is very adamant about getting married with Kōshi, and often tries to do the best she can to please him in any way.