|Nickname:||Mitch Tennison, Mit-chan|
As it turned out, the haunting served as a cover-up for an old homicide case. Following its resolution, the foursome decided to stay together and form the nucleus of what would become the Detective Boys. It is later revealed that Mitsuhiko's parents are both teachers, and he has an older sister, Tsuburaya Asami, about ten years his senior.
Mitsuhiko enjoys reading science books and takes a scientific approach to problem-solving. He is a smart and well-read first-grader who believes that technology can solve most problems. Due to his strict and formal upbringing, he tends to be very formal towards his elders, addressing them with the formal suffix "-san" without regard to the intimacy of their relationship.
Mitsuhiko has a dislike for carrots, and will always eat them last (if ever) if he can help