Yukihiko Iwakura, known as Yuki, is a fourth-year law student at Kansei University residing in Chikusei-so’s Room 102. Slim and lean with pale peach skin, he sports side-swept black hair in an undercut, black square-rimmed glasses, and ear piercings, typically dressed in a blue sweatshirt and black pants.

Quick to irritation, Yuki snaps at teammates’ antics yet balances this sharpness with dry humor and a meticulous eye for detail, such as strategizing Shindou’s running form. Beneath his prickly exterior lies observant care, quietly ensuring his peers’ well-being.

A first-attempt bar exam passer, Yuki casually flaunts this achievement during conversations. His disciplined streak traces back to high school kendo tournaments, contrasting his visceral dislike for cigarette smoke—a point of clash with Akihiro until the latter’s smoking cessation.

Initially resistant to joining the track team, Yuki grows fiercely committed to the Hakone Ekiden goal, his bloodied training shoes marking his relentless drive. Though guarded, he reveals flickers of vulnerability, particularly around Shindou, and navigates tentative curiosity about his parents’ relationship as the narrative closes.

Across adaptations, his design shifts: manga iterations show slightly longer hair, while the anime emphasizes a sleek undercut. His name, combining “snow” (雪) and “boy” (彦), mirrors his cool demeanor interlaced with sharp edges.