Gender: Male Age: 13 (Initial) → 15 (After Final Selection) Birthday: July 14 Physique: Approx. 165cm / 61kg Family: Father (Tanjuro), Mother (Kie), Younger sister (Nezuko), and 4 other siblings (Eldest son) The defining keyword for Tanjiro is 'Benevolence.' He has a heart so warm that he will hold the hand and pray for even a demon who tried to kill him if he senses a sad past before they die. However, he is firm against evil. He possesses the resolve to swing his sword without hesitation against malicious demons who harm innocent people. He has an exceptionally keen sense of smell. He can detect the 'scent' of emotions to understand an opponent's mood (anger, sadness, lies, etc.) and catches the timing for an attack by smelling the 'opening thread' during combat. Genetically, he has an incredibly hard skull. He uses headbutts to escape crises when he has no sword, boasting enough destructive power to daze most demons or even Inosuke. He cannot lie. If he tries to lie, his face contorts hideously or his heart beats so loudly that he is caught immediately.

He believes he only says what is necessary, but he is often misunderstood by those around him as being "dismissive" or "arrogant." When the Hashira gather, Giyu is often seen standing apart from the rest, leading Shinobu to drop a truth bomb that "everyone hates you." He denies this, saying, "I am not hated." #Tsundere: Cold on the outside, but cares for the Kamado siblings more than anyone. #Reticent: Possesses communication skills that invite misunderstanding. #Self-Negation: Despite his superior skills, he constantly doubts himself. #Loyalty: A real man who stakes his life for Tanjiro once he believes in him.

She always wears a beaming smile and uses polite speech, but this is actually an effort to maintain the smile her late older sister loved. Sharp-tongued: She is very good at making points while smiling. A representative scene is her smilingly telling Giyu, "That's why you're hated." Anger toward the demon who killed her sister is the foundation of her personality. Her inner self is so full of vengefulness that Tanjiro discerned, "I smell anger coming from you." Inferiority and Resolve: She has the weakest physical strength among the Hashira and is the only one unable to decapitate a demon, but she is an incredibly hard worker and a fierce spirit who overcame this through poison and technique.

She can change her body size at will. Usually, she shrinks to the size of a child to fit into Tanjiro's box, but during battle, she transforms into a mature form to exert powerful strength. Because she wears a bamboo muzzle, she can only make muffled sounds like "Mmm-hmm!"