Sean has shoulder-length ginger hair and green eyes. He is slightly unshaven and appears to be missing a few upper teeth. He typically wears a bluish-grey jacket, a dirty white union suit, a red and brown patterned vest, blue jeans, and a green bowler hat. His attire varies only slightly. After rescue, he wore black jeans, suspenders, a grey shirt with a black square on the front, and black cuffs.