Sakuraba Yayoi
There isn't a whole lot knocking around in Sakuraba Yayoi's head. Maybe she was dropped on her head, or maybe she was just born stupid. She acted really weird for a couple months after she became a shogi champ by what seemed like complete luck and/or accident. Yayoi is back to her normal self now, armed with new knowledge but unable to think her way out of a paper bag all the same.
