Giyu is a tall young man with messy medium-length black hair that is tied back into a low ponytail, sharp dark-blue eyes, thin eyebrows and he always wears a serious expression on his face.

He wears the standard black Demon Slayer's uniform along with a haori with two different patterns: one solid red and one geometrically patterned with green, orange, and yellow (which were based on the haoris worn by his late older sister Tsutako Tomioka and late best friend Sabito, respectively).