Kuro wears long, black boots that almost reach his knees. His white pants are skin-tight and held up with a red belt, which is rarely seen. The hem of his jacket splits into many threads, starting short at the front but grow in length as they reach his back. His blue jacket is often buttoned open, either a simple black or white shirt hiding under it. He is wearing the bell Mahiru gave him as their contract symbol around his neck as sometimes seen in official illustrations, which is apart from that mostly hidden under his clothes. He also has a patch on his left shoulder with the Roman numeral 1, probably because he is the oldest of the seven sins. Kuro mostly wears a blue jacket which is a tad darker than his hair color with the hood pulled over his head, the black fur looking close to the one of his cat form. Just like any other vampire, he has pointed teeth. They are always half-lidded and express a feeling of boredom. His eye color is red and he has big, dark bags under them. If Kuro is not in his cat form, he has shoulder-length, blue hair with his front bangs reaching his eyes.
