Kiyoshi

Kiyoshi is the elder brother of Shoichi and Teruko, who gets kidnapped by the Tsuzumi Mansion Demon, Kyogai.

Appearance
Kiyoshi is a young man in his early teens, with black hair slightly longer than Shoichi's. He has hazel brown eyes just like his siblings and wears a persimmon colored haori over his green kimono.

Personality
Kiyoshi is a brave young boy who, despite his very understandable fear, managed to survive on his own in a house with three Demons all trying to devour him. He is intelligent and crafty enough to use Kyogai's tsuzumi against him in order to survive. Tanjiro Kamado was impressed by Kiyoshi's will that allowed him to hold out for so long under these conditions.

Tsuzumi Mansion Arc
Due to to his rare blood, the young teen Kiyoshi was targeted as a marechi by Demons and taken by force to Tsuzumi Mansion. There, three Demons fought over who was going to eat him and the ensuing fight caused Kyogai to lose one of his tsuzumi drums. Kiyoshi took the drum and used it to transport himself away from the Demons.

Kiyoshi strikes the tsuzumi whenever danger is near and holds out until help finally arrives. His younger sister Teruko appears to save him alongside a Demon Slayer named Tanjiro. Tanjiro dresses Kiyoshi's wounds and asks for an update on the situation.

The Demon Slayer asks Kiyoshi and Teruko to hold out a little longer while he takes on Kyogai himself. They're nervous at first, but they calm down when Tanjiro states his belief in their ability to be brave.

Tanjiro defeats the Demon and eventually returns for the kids. They panic and throw things at him because the tsuzumi drum has disappeared. Tanjiro commends them for holding out and they leave the house together.

All the siblings reunite while Tanjiro comes to blows with a wild boar-masked Demon Slayer. Zenitsu Agatsuma interrupts their reunion to cower behind them away from the fighting.

After Tanjiro wins, they all work together to bury the bodies of the deceased and pray for them. Before nightfall, the three siblings say goodbye to the Demon Slayers and Tanjiro's crow gives the boy a bag of wisteria to take with him back home.

Abilities
As an ordinary human, he doesn't possess any additional powers or abilities. However, he is called a 'Marechi' by the Tsuzumi Mansion Demons since he has a rare blood type that is favored by them.

Trivia

 * Kiyoshi's name means "clean, pure, distinct, fair, honest" (清).

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Kiyoshi Киёши