Yushirou

A young demon who follows Tamayo. He is an exceptional demon not originating from Muzan, and can live by drinking only a small amount of blood from Tamayo instead of consuming humans. His actual age is 35 years old.

He was saved from a near-death state due to illness by being turned into a demon by Tamayo. Since then, he has been devoted to Tamayo, and is sarcastic and aggressive towards anyone else. He apparently writes in his "Tamayo Diary" every day.

He uses a Blood Demon Art related to vision. He can also lend his or a crow's vision by applying a blindfold or sticking a talisman on the target's face, using his knowledge of engineering and dexterity to develop blood collection devices. During the collection of demon blood taken by Tanjiro, he sends a cat named "Chachamaru" who disappears using a technique.

Understanding Tamayo's resolve, he participated in the Infinity Castle battle. Disguised as a Demon Slayer, he was responsible for medical aid and support in Murata's team. By giving the crows paper eye talismans for Blood Demon Art, he created a communication network and provided information to Kagaya Ubuyashiki who was in command. He also cooperated with Kanroji and defeated Nakime, destroying the Infinity Castle. After returning to the surface, he worked on treating the corps members. Through this battle, he became friends with Takeuchi.

After the final battle, he visited Tanjiro to sincerely commend his achievements. Afterwards, he chose to live under the name "Yushirou Yamamoto" and continues to paint pictures of Tamayo, receiving high acclaim worldwide as a painter today. He remains friends with Kagaya in the modern era.

He continues to appear from the short story "Excessive Hunting."

List of techniques:

Paper Eye (Shigan)

Yushirou's Blood Demon Art. By applying a talisman with an eye-like pattern, it activates a Blood Demon Art related to vision. It can also hide people or objects from sight as a stealth tactic.

Visualization (Kashika)

By applying a talisman and lending an eye, it makes the invisible effects of Blood Demon Art visible.

Shared Vision (Shikaku Kyoyuu)

Shares the vision among those who have the talisman applied. It is possible between humans and animals, and during the final battle, the vision of the Kasugai Crow was shared with the corps members, and Kaburamaru's vision was shared with Iguro. This Blood Demon Art was a significant force in the fall of Infinity Castle.