Kazue is a fairly medium young man of a lean muscular stature and darker complexion, who is almost always seen wearing a happy expression. He has choppy black hair of even lengths, with jaw length side-bangs, and bangs falling over his eyes in a choppy fringe. His eyes are widen and moderately large, having irises a lapis blue color, and their pupils a navy blue, sometimes having his irises completely there and happy, just in dark purple, and are framed by thin eyebrows. Kazue wears a dark cyan standard Demon Slayer uniform, consisting on a button-up jacket with silver buttons, stand collar and long sleeves, a white belt, and a tattsuke hakama pants wrapped by white fading to cyan kyahan, having a pair of white zōri with light cyan straps and tabi socks underneath being the same color as his uniform. Over this, Kazue wears a haori that is fading from a color, the haori is a white haori with fading cyan, This haori were later noted to have belonged to his late younger sister, Tsumugi.