Byakuya is 185cm and weighs around 68kg, with a tall, slender build. He has pale skin, lapis blue eyes, and has chin-length blonde canary yellow hair. He wears a black suit jacket over a white shirt and lapis blue crossover tie. He also wears black dress pants accessorised with a black belt, and black dress shoes with a slight heel. He has a silver pocket watch in his suit breast pocket and had the pin of his former high-school on his lapel. He has white rectangular glasses.