Tanjiro is a young boy of average height with fairly tanned skin and an athletic, muscular physique. He has ruffled, black hair with burgundy tips, combed back to expose his forehead, and wide, dark red eyes with white pupils that appear lighter around the lower section of his irises. He also has a scar on the top left of his forehead. Nezuko is his demon little sister.

Obanai is a young man of short stature, pale skin complexion, and a fairly muscular build. He has straight-edged black hair.