Suguru is a slacker, who doesn't go out of his way to do anything productive unless it involves music. However, he is very competitive and often makes impossible bets that he would never be able to fulfill if he loses. He sticks up for whatever is important to him, which often gets him in trouble. He has many flaws, such as drinking, girls, and drugs. Even though Suguru usually causes trouble for the band, it is his talent which gives the band its uniqueness. Suguru's eye color is black.