Zenitsu Agatsuma

Zenitsu Agatsuma (我妻善逸 Agatsuma Zen'itsu?) is a Demon Hunter and member of the Demon Killing Corps. He is a traveling companion of Tanjiro Kamado and one of the main protagonists of Demon Slayer: Kimetsu no Yaiba. Zenitsu has short blond hair, which was originally black, and brown eyes with thick eyebrows. He wears the standard Demon Hunter uniform underneath a white-triangle pattern, yellow haori. Zenitsu is a coward, always claiming he doesn't have long to live due to the dangerous job of being a Demon Hunter. He is also a bit of a womanizer and likes to hit on girls who he thinks are cute and ask them to marry him much to their annoyance. Zenitsu has low self-esteem but still wants to live up to the expectations others set up for him.

However, he was constantly afraid and would always cry and run away. He claims he wants to live a modest life where he can be useful to someone. Despite all his spinelessness, Zenitsu holds great respect and admiration towards his comrades and his deceased teacher, Jigoro Kuwajima. His focus and drive in avenging him wash away all his cowardice and second thoughts. When Zenitsu was a young boy, he was financially supported by a woman who owned a lot of debt. She had eloped with Zenitsu, which got him into troubled and it was 'Gramps', the former Thunder Pillar, who saved him from the trouble. Gramps decided to train Zenitsu along with his eldest disciple, Kaigaku. On one of the days during his training, Zenitsu climbed up a tree because he felt that he was disappointing Gramps, when suddenly, a stroke of lightning hit him, causing his hair to turn blonde. Zenitsu and Kaigaku hated each other; however, Zenitsu respected Kaigaku and treasured him. Zenitsu eventually wished to fight alongside Kaigaku one day, and thus he created a seventh style, 'Breath of Thunder, Flaming Thunder God'.

Natural Abilities

Enhanced Sense of Hearing: Zenitsu has a heightened sense of hearing, allowing him to detect danger from even the faintest of sounds. He could also hear the inner thoughts of people if he uses the sense of hearing to its fullest ability.

Unconscious Combat: Zenitsu becomes stronger when he sleeps. When his life is in danger, the fear he experiences exceeds his limits making him fall unconscious. When Zenitsu is asleep, he can perform his swordsmanship at a high level purely based on instinct alone. However, as he continues to improve his skills and courage, he begins to depend on this ability less and less.
Swordsmanship

Breath of Thunder Style (雷の呼吸 Kaminari no kokyū?): Taught to Zenitsu by a former Pillar, Jigoro Kuwajima. This technique increases the user's strength and agility to equal a demon's. There are a total of six styles that can be used with the Breath of Thunder, but Zenitsu was so untalented that he was only able to learn the first of the six styles, which is said to be the simplest. Later on, he was able to create a seventh style when confronting his former senior.