Forehead Mark (Scar): He has a large scar on the left side of his forehead. Originally a burn from protecting his younger brother as a child, it awakens into a true 'Mark' through the Final Selection and battles, changing into a darker, flame-like shape. Hair: Short, spiky hair with a reddish-black (reddish-brown) tint at the tips. Eyes: Large, dark red eyes similar to his hair color, giving an overall passionate and warm impression. Clothing and Accessories Earrings: He wears Hanafuda-style earrings with a sun design on both ears. These are traditional symbols passed down through the family of the successors of the 'Sun Breathing,' the first breathing style. Haori: He wears a unique green and black checkered haori over his Demon Slayer uniform. Physique and Other Sturdy Build: As the eldest son of a charcoal-burning family, he has been disciplined by chopping wood and hiking mountain paths since childhood; though he may look small, he has a sturdy build. Hard Forehead: While not a visual trait, his forehead is so hard it is legendary, capable of knocking out Inosuke in his boar mask or the Mist Hashira Muichiro Tokito with a headbutt. Compassion even for Demons: Even if it is a demon that tried to harm him or his family, he never forgets they were once human and feels pity for them. He is a unique individual who holds the hands of dying demons and comforts their souls. Deep Empathy: He feels the sorrow and pain of those around him as if it were his own, possessing a healing personality that warms the hearts of even strangers. Strong Sense of Responsibility and Eldest Son Spirit: "I could endure it because I'm the eldest son." The responsibility of caring for his mother and siblings as the eldest son of a charcoal-burning family is ingrained in his bones. Even in extreme pain or desperate situations, he composes himself and perseveres by telling himself, "I am the eldest son."

Extremely ugly. Relies on heavy makeup. Whiny. Tries to claim Tanjiro for herself. Hates women, especially Kanao. Tries to drive a wedge between people. Acts overly cute and flirtatious.