Karasu tends to look down on people he considers "mediocre". He is wary of his surroundings and is able to control. He is smart, but he has a sharp tongue and he never misses a chance to offend someone, be it friend or foe. He doesn't like it when something goes wrong, even if it doesn't really matter, so it seems to others that he is always complaining. he is a professional police officer and a boss who loves his employees and students, but also likes to make fun of them.