Nezuko Kamado is Tanjiro’s sister and one of the central characters in Kimetsu no Yaiba.
She was lucky enough to survive when Muzan Kibutsuji attacked her family; on the other hand, she ended up becoming an oni (demon).
After he became a demon, Nezuko used a piece of bamboo in his mouth. But anyway, why does she use it?
Nezuko received the piece of bamboo in the first episode of the anime, when she still couldn’t fully control her predatory instincts. Giyu Tomioka, the Hashira of Waters, cut a piece of bamboo while Nezuko was unconscious and placed it in Tanjiro’s sister’s mouth in an attempt to hide fangs from her.
This prevented Nezuko from sinking her teeth into a human and, as a consequence, did not cause her to be hunted by the Demon Hunters. Many thought that the piece of bamboo was part of Nezuko’s look, like it was some kind of mask or something.
However, he is just an object that does not allow her to release her bloodlust. Although she is the protagonist’s sister, Nezuko is still a demon, that is, no one can trust her 100%, as her demonic instincts can attack at any time, causing Nezuko to involuntarily hurt whoever is beside her.
Having never ingested human blood thanks to the bamboo device that Tomioka placed in her mouth, Nezuko, despite being a demon, is not wanted by Demon Hunters.