Yuji is a young man of average height and appears to have a slender build when wearing baggy clothing, but actually has a lean and muscular physique. He also has relatively large light brown eyes and spiky pink hair (brownish blonde in the manga) that’s styled in an undercut fashion. When becoming the vessel for Sukuna after eating his finger, he gains a second pair of eyes that only open when Sukuna controls his body along with his many markings.

At the start of the series, Yuji wore a light-colored hooded jacket, high-cuffed black pants, and white shoes. However, in the anime, his pants were denim, and his shoes were bright red. When Yuji enrolled into the Tokyo Metropolitan Curse Technical College, he began wearing his version of the uniform; a black long sleeve shirt resembling a gakuran over a red hoodie, black pants, and red shoes.

He gains a noticeable scar between his two eyes and a smaller scar on his left labial commissure of the mouth during the Shibuya Incident.