Demon Slayer: Zenitsu Agatsuma The Thunder Beast

Zenitsu's debut is defined by fear and anxiety, a sharp departure from the calm demeanor of his fellow Demon Slayers. However, it is precisely this vulnerability that makes Zenitsu's transformation all the more compelling. From the moment he wields his blade, a journey of growth begins for the Thunder Beast.

Mastering Thunder Breathing

At first, Zenitsu appears weak, showing remarkable strength only while asleep. In this state, he effortlessly defeats powerful demons like the tongue demon and the spider family's son. In the Mugen Train arc, he protects Nezuko and the train from the lower-rank one demon, Enmu, and even goes head-to-head with the upper-rank six demon, Daki, using his special move "Godlike Speed" with Inosuke's help. However, Zenitsu's true strength emerges when he is awake. He outmatches the new upper rank six demon, Kaigaku, showcasing his speed and power. Moreover, he keeps up with the weakened Demon King, Muzan, suggesting his strength rivals that of a Hashira.

Zenitsu demonstrates mastery as a swordsman, showcasing incredible speeds through his Thunderclap and Flash techniques. This technique involves unsheathing his katana, moving at lightning speeds to execute a decapitating attack, and then smoothly sheathing his katana—a classic samurai maneuver. Despite being a slow learner, Zenitsu excelled in the first of the six Thunder Breathing styles.

He not only mastered this style but also created his own variations, employing them effectively against formidable foes like Kaigaku. All his special moves stem from the Thunderclap and Flash technique, serving as extensions of the first form of Thunder Breathing. Speculation abounds that Zenitsu ranks among the most potent Demon Slayers in the series.

Comedic Relief to Formidable Warrior

Beyond his combat prowess, Zenitsu's comedic interludes provide a welcome balance to the intense atmosphere of Demon Slayer. His quirky personality and interactions with fellow Demon Slayers, particularly Tanjiro and Inosuke, make him a beloved character. Yet, when the time comes to draw his blade, Zenitsu transforms into a force to be reckoned with, surprising both allies and enemies.

In addition to his Thunder Breathing style, Zenitsu boasts heightened hearing, a skill enabling him to attentively detect impending danger. This ability proves particularly advantageous when he is in an unconscious state, providing him with insight into his surroundings and the positions of his opponents. Thanks to rigorous training over the years, Zenitsu possesses remarkable strength and speed, allowing him to leap to great heights and move at speeds reminiscent of a flash, giving him a distinct competitive advantage over adversaries.