Bokuto Kōtarō, 190. cm. Very tall, sturdy and muscular body. Bokuto has golden eyes and grayish-white hair with black streaks. 

Kōtarō has a fun, outgoing, bombastic, and childlike personality as well as a volatile mood.

He plays on the volleyball team as an ace and captain. He's is recognized as one of the top five and top 3 aces in Japan. He's an outside hitter for the MSBY Black Jackals, a Division 1 team in Japan's V-League. He's is also a member of the Japan National Volleyball Team.