Zenitsu Agatsuma Is a demon slayer that uses Thunder breathing. He is 16 years old. He is cowardly, weak-willed, and anxious, often claiming that he doesn't have long to live due to the dangerous job of being a Demon Slayer. Zenitsu uses a Nichirin sword to kill demons. He mastered only one form of Thunder breathing and made his own seventh Thunder breathing form. He is deeply in love with Nezuko Kamado and he is a Simp for her and wants to marry her. Zenitsu hates Kaigaku the upper moon 6 demon