Tsuki's father is a famous detective and his mother is an expert in martial arts. Because of the three Ph.D degrees he earned at a young age, he is nicknamed "Early Genius." He is also nicknamed "Samurai Boy" for his traditional Japanese outfit and mannerisms. Tsuki, Riku, Shinjuku, San and Taiken became Team Kyoji before the Final Battle of Ka Boa Bu.
- Tsuki means Month.