Karasu tends to look down on people he find 'mediocre'. He is wary of his surroundings and is able to control and produce chemical reactions with those around him. He is intelligent, but has a sharp tongue and never misses a chance to insult someone. Otoya has a laid back and relaxed personality, rarely being shown as pressured or under stress even during a match. He has no problem taunting his opponents and appeared to be entertained when Rin and Shido began to fight after their match.