Fumikage is a short young man with the head of a black bird, possibly supposed to resemble that of a crow or a raven. He has a tan, yellowish beak, which is slightly hooked down at the end, thin, red eyes with a small black pupil, one on each side of his head, and a red choker, which he rarely removes. Despite the appearance of his head, however, his body looks like an average human, with relatively fair skin. After his internship training with Hawks, Fumikage has become more muscular. After the Paranormal Liberation War, he gains a scar on his left foot as a result of Dabi's flames.

His costume consists of a black robe that is tinted a dark purple where light hits it, covering his entire body, only stopping halfway down his shins and knee-high black boots. During the Joint Training Arc, it was revealed that under this cape, he wears a dark t-shirt, wristbands, baggy pants, and a utility belt with a double pin buckle.

Following the Final War, Fumikage adorns a new look with his hair now being more ruffled and feathery, along with notable eyebrows, being somewhat reminiscent of Hawks' hairstyle.