Shuichi's distinctive appearance is characterized by his signature black cap adorned with three white stripes at the back, complemented by a silver star positioned near the front. Beneath this cap, his short dark teal hair sports a small ahoge, adding a touch of whimsy to his overall look. His complexion, pale and ethereal, contrasts with his slim figure. His eyes are a gambogeish grey hue framed by thick, expressive eyelashes that betray depths of emotion.
Dressed in a double-breasted, pinstripe outfit, Shuichi exudes an air of understated elegance. Thin, grey stripes traverse the expanse of his black uniform, lending it a sleek sophistication. The pinstripe design extends to his matching pants, accentuating his long legs with subtle flair. Notably, the emblem of his former school adorns the breast pocket of his uniform, its dull golden hue providing a striking contrast against the predominantly dark ensemble. Completing his ensemble are dark blue loafers, combining fashion and functionality to ensure Shuichi can navigate his investigations with ease and style.
In the prologue, Shuichi wears his original high school uniform, exuding a timeless charm reminiscent of classic academia. The blazer-style jacket, pants, and striped blue necktie exude a sense of formality, enhanced by the large collar that adds a touch of grandeur to his appearance. Despite the formal attire, Shuichi remains steadfast in his choice to don his trademark cap, emphasizing his commitment to his personal style regardless of its compatibility with his uniform.