Very organized, and blunt about faults. Even with these traits, he is so capable that Amu and Yaya call him "class president". He can also become very shy in certain situations. He has a tendency to be the "planner" of the group, ad he usually leads the meetings and instructs what is to be done by each member. He has dark black hair, often looking like a girl and old-fashioned glasses. Kairi is the younger brother of Yukari Sanjo and was sent to spy on the Guardians by being the new Jack.