Tanjiro is a young man of average height with lightly tanned skin and an athletic, muscular build. His hair is ruffled and black with red tips (appearing black that turns to burgundy at the tips in the anime), and is swept back to reveal his forehead. His eyes are wide and dark red, fading into a burgundy hue with white pupils that appear lighter toward the lower section of the iris, while the upper portion is markedly darker. He bears a distinct scar on the upper left of his forehead. After becoming a Demon Slayer, Tanjiro wears the standard Demon Slayer uniform that is similar to the Japanese military uniforms of the Taishō era. It consists of a button-up jacket with a stand-up collar and long sleeves, featuring silver buttons and a shirt pocket on the left breast, with the kanji for Destroy engraved on the back of the uniform. Beneath the jacket, he wears a white long-sleeved collared undershirt. The uniform also includes tattsuke-hakama pants tucked, fastened with a white belt around his waist, and strapped securely around his calves with a pair of buttoned white kyahan, along with tabi socks that match the color of his uniform. On his feet, he wears a pair of white zōri sandals with dark red straps. Over this, he dons his signature checkered haori. He carries a large wooden box on his back (which was a gift to him from Urokodaki, where his sister sleeps as they travel during the day. Tanjiro is very kind by nature and has been described by others as having very gentle eyes and a compassionate persona. He exhibits a great deal of determination and will not give up once he has a goal to achieve; the best example of this is his relentless quest to find a cure for Nezuko. Even though he is relatively strong on his own, Tanjiro isn't opposed to asking others for help when he needs it. He is very protective of his friends, and especially so of his younger sister. However, despite his kind and understanding nature, Tanjiro does have a limit to his tolerance and has a distaste for rudeness and cowardice, as he easily becomes annoyed by Zenitsu’s constant whining and angered by Inosukes barbaric actions. Tanjiro is direct and very honest, taking everyone's words with sincerity and seriousness. He has amazing sense of smell. He is fifteen years old. He uses sun and water breathing.