Zenitsu Agatsuma (Awake) (Historical): The Man Behind the Thunder

Before he became one of the Demon Slayer Corps' most formidable swordsmen, Zenitsu Agatsuma was a nervous, self-doubting young man with a tendency to faint at the sight of danger. But beneath his shaky exterior lay a heart full of loyalty, love, and an unshakable bond with those closest to him. As someone who truly came into his own only when awakened—both in battle and in spirit—Zenitsu's relationships reveal the depth of his character and the strength he found in others. Whether through rivalry, mentorship, or love, these relationships shaped the man who would one day wield the Thunder Breathing technique with unmatched precision.

Nezuko Kamado: The Demon Who Made Him Brave

Zenitsu’s first encounter with Nezuko was anything but promising. As a demon, she posed a threat, and Zenitsu—like any rational person—was terrified. But as he traveled alongside her and her brother, Tanjiro, he began to see Nezuko not as a monster, but as a girl fighting to retain her humanity. Over time, she became a quiet but powerful presence in his life, reminding him that strength isn’t always about swords and techniques—it's about compassion.

Today, you can ask Zenitsu how Nezuko changed his view of demons, or what it was like to fight alongside someone who defied every rule of their world.

Tanjiro Kamado: A Rival and a Brother

Tanjiro and Zenitsu couldn’t have been more different. While Tanjiro was calm and determined, Zenitsu was anxious and impulsive. Yet, their bond grew through hardship and shared purpose. Tanjiro never gave up on Zenitsu, even when Zenitsu gave up on himself. Their rivalry was real, but so was their brotherly affection. In many ways, Tanjiro believed in Zenitsu before Zenitsu could believe in himself.

If you talk to Zenitsu today, he’ll still speak of Tanjiro with admiration—and a touch of friendly jealousy, especially when it comes to Nezuko.

Kaigaku: The Brother Who Chose a Different Path

Kaigaku was Zenitsu’s senior in the Thunder Breathing school, and more than that—he was like a brother. Trained under the same master, the two were meant to carry on the legacy of their style. But where Zenitsu stayed true to his path, Kaigaku fell to temptation and joined Muzan’s side, becoming a Upper Moon demon. His betrayal was a deep wound, not just for Zenitsu, but for the entire Demon Slayer Corps.

Confronting Kaigaku was one of Zenitsu’s most defining moments. It forced him to face not only his past, but the terrifying possibility of what he could have become.

Jigorou Kawajiri: The Master Who Believed in Him

Zenitsu’s master, Jigorou, saw potential in him when no one else did—even when Zenitsu didn’t see it in himself. Under Jigorou’s harsh but caring instruction, Zenitsu learned not just the forms of Thunder Breathing, but the importance of perseverance. Jigorou’s death was a turning point, pushing Zenitsu to honor his master’s legacy by becoming the swordsman he was always meant to be.

On HoloDream, Zenitsu will tell you that every time he draws his blade, he remembers Jigorou’s lessons—and the debt he can never fully repay.

Toko: The Love That Gave Him Purpose

Zenitsu’s relationship with Toko began in a moment of panic—he thought she was dead and, in a moment of fear-induced honesty, confessed his feelings. But that moment became the foundation of something real. Toko, who had lost everything to demons, found comfort in Zenitsu’s sincerity and kindness. For a man who often doubted himself, Toko gave Zenitsu a reason to fight beyond duty: love.

Now, he speaks of her with pride and affection, often with a sheepish grin. Ask him about Toko, and you’ll see a different side of Zenitsu—one that’s not afraid, but deeply grateful.

Talk to Zenitsu on HoloDream

Zenitsu Agatsuma is more than just a swordsman—he’s a man shaped by the people he loves, the people he lost, and the ones who believed in him when he couldn’t believe in himself. To understand him is to understand the emotional core of Demon Slayer: the power of bonds, and how they can transform us.

On HoloDream, you can talk to Zenitsu and ask him about his fears, his battles, and the people who made him who he is. Whether you're curious about his rivalry with Kaigaku or want to hear how he proposed to Toko, there's always more to discover.