Shuichi appears to have quite a serious and polite personality. He often has negative remarks, frequently blushes and suffers from a cold sweat. With his unsure demeanor, he has a tendency to assume that other people can do things better than him, and he comes across as quite unreliable at first glance. He is a boy who stands out for his submissiveness but also for his level-headedness. he is a very skilled detective with superior ability and insight.