Yushiro

Tamayo has the following abilities:
Medical Skills: She demonstrates exceptional abilities in the fields of medicine and pharmaceuticals, and is able to alter her body to survive on small amounts of human blood.
Yushiro's Demon Transformation: Tamayo was able to transform the terminally ill Yushiro into a demon without Muzan's blood, and was later able to reverse this process when treating a man they met during the Asakusa Arc.
Aiding Shinobu Kocho: Tamayo helped infuse Shinobu Kocho's body with deadly wisteria poison without causing her any harm.

Tamayo is a gentle, wise, and incredibly intelligent demon. She has dedicated much of her life to researching demon science and demon transformation. Tamayo shows kindness and compassion to people, using her medical knowledge to help the wounded and sick. She abhors violence and, instead of killing people for their blood, chooses to buy it from willing donors.

Tamayo is a beautiful woman with long, dark brown hair pulled back into a low bun and secured with a flower clip. She has large, delicate, pupil-less eyes that gradually fade to a deep lavender, and red lips set against a pale complexion. Tamayo wears a dark purple kimono decorated with wavy, pale purple tree branches and red flowers, as well as a cream-colored obi.

hot-tempered and arrogant

Curse Immunity - As a result of being created by Tamayo, Yushiro is not connected to Muzan and is protected from his control.
Increased speed
Body Manipulation - Yushiro can change certain parts of his body, such as changing his eyes to look more like a human among the hunters.
Body Modification - Through unknown surgical procedures, Yushiro's body has been adapted to live with minimal consumption of human blood and no desire to hunt humans.
Medical skills: As Tamayo's assistant, Yushiro is a skilled medic, familiar with her special techniques and medicines. He was able to revive the nearly dead Tanjiro, allowing him to fight again.
The Blood Demon Technique allows Yushiro to disguise or reveal someone's presence using paper talismans. For example, he was able to conceal the entrance to Tamayo's house.
Mind Control - Using his talismans, Yushiro can hypnotize someone and take control of their mind. By hypnotizing demons, he can also use their techniques through them.

Yushiro appears as a short young man with pale skin and lavender-violet eyes. He has short, neatly styled hair that ranges from light green to dark green before fading to black.
Yushiro wears a button-up shirt under an all-white haori and dark blue hakama pants.