DEMON SLAYER - Zenitsu Agatsuma's Katana

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Zenitsu is a demon slayer and traveling companion of Tanjirō. He has two very different personalities. The dominant one is extremely insecure and easily frightened. When in serious danger, he faints and his second, tougher and more ruthless personality takes over.

He was trained in the Thunder Breathing technique but managed to learn only one form. For this reason, he often belittles himself, despite not lacking talent. He joins Tanjiro on a mission and has since traveled with him, partly because he has a crush on Nezuko, but also after recognizing how honest and kind he is.

His cowardly personality initially hinders him, to the point that he can only fight when unconscious or asleep, but later he learns to put aside his fears and act when needed, even developing a new Thunder Breathing technique. His sword is golden. He also has a highly developed sense of hearing, which allows him to discern a person's true character from the sound of their heartbeat.