In the Kimetsu no Yaiba universe, demons are the main villains of the main characters as their goal is to eat humans in order to become more powerful beings and serve their master Muzan, who strives to be the perfect living being. However, there are representatives of the demonic species who do not agree with the destruction of humanity and try to fight it from the shadows, as in the case of Lady Tamayo.
Who is Mrs. Tamayo?
Tamayo is a demon who left behind a thirst for humans and served Muzan Kibutsuji for several years. He understood and rethought his master’s cruel ambitions and, after escaping the antagonist Kimetsu no Yaiba, establishing a lifestyle based on small doses of blood and suppressing his negative thoughts, he devoted the rest of his long life to studying the composition of demons and healing people.
Source: Ufotable
Through his research, Tamayo not only created medicines for humans, but also understood the nature of demons and prepared poisons for them. In this sense, she is called by the Demon Slayer Corps to work alongside Shinobu Kocho to develop a toxin that can weaken and kill Muzan Kibutsuji and his Upper Moons.
Source: Ufotable
How did Tamayo become a demon in Kimetsu no Yaiba?
Tamayo led an ordinary human life until she was attacked by an incurable disease. Desperate to regain her health, she turns to Muzan, who offers her a cure that will turn her into a ruthless demon and kill her husband and children, as well as a large number of people.
Source: Shueisha
Among all the characters in Kimetsu no Yaiba, Tamayo was the only one who knew the main villain’s weaknesses, as she witnessed him being defeated at the hands of Yorichi Tsugikuni.
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