Illumi has long jet-black hair that goes down to his waist. He has large, black pupil-less eyes. He wears a green collared vest with needles attached in many parts. Illumi also wears baggy green pants with the same colored loafers with needles attached to the tips. Illumi sometimes uses disguises to hide his identity, although only when people he knows are present. The ball-ended hands Illumi keeps on him are not just for show but are integral parts of his fighting style.