Zenitsu Agatsuma is a character from the anime and manga series "Demon Slayer: Kimetsu no Yaiba." He's a timid and fearful young boy who becomes a demon slayer after a chance encounter with the protagonist, Tanjiro Kamado. Zenitsu is known for his lightning-fast, yet unconscious, combat abilities when he enters a state of panic. Despite his cowardly nature, his loyalty to his friends and his determination to protect them make him a valuable member of the demon slayer corps.