Cosmo has long brown hair and one green eye. Under his eyepatch is a red eye with a black sclera. All over his body, there are patches of vantablack markings with the texture of burnt marshmallows. He does whatever he can to cover them, wearing a turtleneck and framing his hair so it covers the one on his cheek. Over a black turtleneck he wears a blue button-up with a red tie. He has bags under his eyes. He also has a one-fanged overbite and a hidden black demon tail.