Yushiro

The demon Tamayo turned and the only one she ever created, fiercely devoted to her and openly rude to everyone else. He guards her clinic with concealment techniques and resents Tanjiro for taking up her attention, though he grudgingly assists the siblings. His blunt jealousy provides comic relief while his talismans keep the pair's existence hidden from Muzan's spies.

A slight, sharp-featured young man with very pale skin and short dark hair worn in a slightly untidy crop, with lighter strands near the tips. His eyes are a cool, luminous colour marked with the faint lettering common to demons, and his expression defaults to a scowl or a flat stare. Unlike his mistress he dresses in Western style, favouring a plain shirt and dark trousers suited to running errands in a modern city. He handles paper talismans constantly, and his small, quick movements suggest someone who prefers sleight of hand to open confrontation.

Blunt, prickly and openly rude, he treats almost everyone outside his household as an intrusion and makes no effort to hide it. The single exception is Tamayo, whom he adores with an intensity that borders on comedy: he praises her constantly, bristles at any perceived slight toward her and resents attention she gives to anyone else, which is why he takes an instant dislike to Nezuko. Underneath the sulking he is loyal, disciplined and genuinely capable, keeping the clinic hidden and the research safe for years. He fights when he must despite being physically weak, and he can be shamed into cooperation by anyone who proves they will protect her.

He was a dying young man with no prospect of recovery when the demon doctor found him. She offered him her blood, and he became the only demon she has ever made, bound to her not by the demon king's blood but by gratitude that quickly turned into devotion. Freed from the compulsion to eat humans, he lives as she does, sustained by small amounts of her blood, and has spent the long years since as her bodyguard, assistant and concealment specialist. He learned to use his Blood Demon Art for hiding rather than killing, screening their clinic and their movements from both demons and the Demon Slayer Corps, and has helped relocate the practice whenever discovery threatened.

1. Asakusa Arc

   He first appears helping to clear the aftermath of the demon king's escape and then grudgingly admits Tanjiro to the hidden clinic. His hostility toward the visitors, especially Nezuko, provides most of the friction in the scene, and it is his talismans that keep the building invisible to anyone searching the district.

2. Asakusa Arc: Yahaba and Susamaru

   When the clinic is attacked he fights despite being badly outmatched, taking severe injuries to shield the doctor. He makes himself and his allies unseen with his talismans, directs Tanjiro's counterattack, and endures a brutal beating while the trap that destroys the attacker is set up.

3. After Asakusa

   He evacuates the clinic and relocates the research with his mistress, continuing to hide their new base from pursuit. His cooperation with Tanjiro settles into a grudging working arrangement built on blood samples and messages, and his jealousy softens just enough for him to acknowledge the boy's sincerity.

Tamayo

Saviour and the object of his devotion

She turned him to spare his life and he has never stopped repaying it, serving as guard, assistant and admirer. His feelings are obvious to everyone except, apparently, her, and he guards her reputation as fiercely as her person.

Tanjiro Kamado

Reluctant ally

He resents the boy on sight for intruding on the household and for the attention the doctor pays him. Fighting alongside him and seeing him take injuries to protect others forces a grudging respect that never quite becomes friendliness.

Nezuko Kamado

Rival for attention

He is openly hostile toward her, offended that a demon who sleeps rather than eats should fascinate his mistress. The jealousy is petty, loud and entirely one-sided, since Nezuko barely reacts to him at all.

Yahaba and Susamaru

Enemies

The two demons sent to retrieve the doctor nearly kill him in the attack on the clinic. He absorbs a great deal of punishment to keep them occupied so the trap closing around them can be sprung.

• He keeps the demon doctor's clinic invisible in the middle of a busy district using nothing but written talismans.
• He insults Tanjiro and Nezuko almost from the moment they arrive, setting the tone for their partnership.
• He is beaten nearly to pieces defending his mistress and keeps fighting anyway.
• He turns Tanjiro invisible at the decisive moment of the clinic battle.

• He is the only demon the doctor has ever created, and the only one she considers family.
• He survives on small amounts of her blood rather than human flesh, which leaves him physically frail for a demon.
• His talismans work on inanimate objects as well as people, which is how an entire building stays hidden.
• He is voiced in Japanese by Nobuhiko Okamoto.

• Tanjiro Kamado
• Nezuko Kamado
• Zenitsu Agatsuma
• Inosuke Hashibira
• Giyu Tomioka
• Sakonji Urokodaki

• Muzan Kibutsuji
• Tamayo
• Shinobu Kocho
• Kanao Tsuyuri
• Rui
• Sabito

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