Shuichi appears to be a quiet, serious, and polite guy. However, he is also stated to have a weak personality, and he is abnormally timid when it comes to speaking. 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. However, Shuichi can also have a stronger attitude at times when the situation calls for it.