Toudou Kouichirou (刀藤 鋼一郎) is Toudou Kirin's uncle.
Kouchirou has long gray hair that he has tied in a tail in addition to a mustache and eyes of the same color. He has a sturdy build and usually wears a suit. During the new years celebrations, he wore a crested kimono with a hakama.
Originally, Kouichirou had an ambitious and strict personality, using Kirin as a tool for his own gain and abusing her whenever she irritated him. However, later on, he is shown to have mellowed out in addition to getting rid of his ill will toward his brother Seijirou.
Weapon: Kouichirou was the original owner of Hiinamaru (雛丸) until he gave it to Kirin. As his brother became the successor of Toudouryuu, Kouichirou received the katana instead.