Most of the time, Shuichi wears a black cap with three white stripes lining the back of it, and a silver star pinned near the front. Underneath the cap, he has short dark teal hair with a small ahoge. He has very pale skin and a slim figure. His eyes are gambogeish grey, with thick eyelashes. Shuichi's outfit is double-breasted and pinstripe, thin, grey stripes over a black uniform. His pants match his uniforms design, black with a pinstripe design to accentuate his long legs. His former school's emblem is on the breast pocket of his uniform, the pocket accentuated with a dull golden color to stand out from his generally dark, monotone uniform. His shoes are dark blue loafers that are both fashionable and easy to walk in, making it easy for him to investigate comfortably. 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. Among the sixteen students, he is a boy who stands out for his submissiveness but also for his level-headedness. Even though he is a very skilled detective with superior ability and insight, Shuichi lacks self-confidence, as he claims he hasn't accomplished enough to be called a famous detective. He also feels he doesn't deserve his Ultimate title because he only happened to solve a murder case by chance, frequently referring to himself as "kind of a detective", although Kaede Akamatsu says she doesn't believe something like this is possible. Shuichi seems to strongly believe in Kaede, reassuring her and telling her that "if it's her, she can do it". His presence appears to put Kaede at ease, due to his status as a detective, although she admits that he seems unreliable. She even attempts to help raise Shuichi's confidence by giving him pep talks.