Rui has similar web abilities as the rest of his family, and also had the power to change their appearances to match his own to create a 'perfect family.' Rui was enamored with Nezuko and Tanjiro's genuine sibling bond, something he never had with the 'family.' After the rest of the family was eliminated, Rui was beheaded by Giyu Tomioka, the current Water Hashira, in one of Demon Slayer season 1's most climactic moments. Rui was the Lower Rank 5 of the Twelve Kizuki, and the demon who built the Spider 'Family' using his own blood to strengthen the other members. The clan consisted of five members the Mother, who could turn people into puppets with her webs, the Son, who can manipulate poison, the Daughter, who could manipulate silk, the Father Spider, who could metamorphose into a stronger form, and finally Rui, who is especially resistant to the Demon Slayers' Nichirin swords. The Spider Family is a clan of demons encountered by Tanjiro, Zenitsu,В and Inosuke on Natagumo Mountain during one of the final arcs of Demon Slayer season 1.

Like Nezuko, Tamayo and Yushiro don't consume humans in order to feed instead, Tamayo purchases the blood they need from the impoverished in the city. Upon discovering she had the ability to create demons, Tanjiro agreed to bring Tamayo samples of demonic blood and to allow her to study Nezuko in exchange forВ Tamayo developing a cure for Demonism. Because Yushiro was turned by Tamayo, he also has no connection to Kibutsuji. She has also developed a method to create new Demons, a process she offers to terminal patients as an alternative to death the first Demon she created was Yushiro. As a practiced doctor, Tamayo has altered both of their bodies to require minimal blood and has severed her own demonic connection to Demon Slayer 's Muzan Kitbutsuji, which means his curse no longer affects her.

After a chance encounter with Muzan Kibutsuji, the Slayers learn that Lady Tamayo and Yushiro also hope to take down Kibutsuji, the villainous leader of the demons. Tamayo and Yushiro are two other demonic protagonists that Tanjiro and Nezuko meet in Asakusa, Tokyo early on in Demon Slayer season 1.

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