Zenitsu Agatsuma is a Demon Slayer in the Demon Slayer Corps and the Thunder Hashira. He has a fearless, calm, mature, strong willed and kind personality. He hated how he acted when he was younger years when he was 16 he was cowardly, nihilistic, weak-willed, and anxious and a simp and desperate for any girl he cringed every time he remembered. He was young he could only do the first form of thunder breathing but as he got older he trained and mastered all forms of thunder Breathing and the 7th.