Summary
- Zenitsu Agatsuma shines in Demon Slayer with hilarious antics and unexpected moments of brilliance in dire situations.
- Key impactful episodes highlight Zenitsu’s growth, courage, and dedication to the greater good.
- Zenitsu’s true potential is showcased in pivotal moments, revealing his dual nature and unwavering spirit.
Koyoharu Gotouge’s Demon Slayer has a diverse cast of characters, each with unique backstories, traits, and fighting styles. Among the many standout characters, Zenitsu Agatsuma shines because of his eccentric personality, unheroic fear of demons, hilarious antics, and unexpected moments of brilliance in the unlikeliest of situations.
Despite his flaws, Zenitsu has fought some of the most dangerous demons in existence and has helped the Demon Slayer Corps by eliminating some of its most formidable foes. Although there are quite a few episodes that brilliantly capture the dichotomy of his personality and showcase his growth, these seven stand out as the most impactful.

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7
Season 1, Episode 24: “Rehabilitation Training”
Zenitsu at His Comedic Best
- IMDb rating: 7.6
- Arc: Rehabilitation Training Arc
After the violent battle on Mount Natagumo, Zenitsu and his friends receive medical attention at the Butterfly Mansion. Following their recovery, the trio is expected to start training before they embark on their new mission.
I’ve protected it. You told me… this is more important to you… than your own life.
“Rehabilitation Training” revolves around Tanjiro and his friends’ rigorous recovery path that involves a ruthless conditioning regimen. The episode is made special by Zenitsu’s overdramatic shenanigans and outbursts that add a comedic touch to an otherwise grueling rehabilitation process.
6
Season 2, Episode 10: “What Are You?”
Zenitsu Breaks Character and Takes a Stand
- IMDb rating: 7.8
- Arc: Entertainment District Arc
In the Entertainment District Arc, Tanjiro and his friends disguise themselves as girls to investigate the region and solve the mystery behind countless disappearances, including Tengen Uzui’s wife. During their time there, Zenitsu lives in the Kyogoku House and desperately looks for any clues that will lead him to the potential demon behind the strange events.
Before you die, I have a task for you. Apologize to the girl whose ear you nearly tore off. It may be your money that pays for their clothing, food, and housing, but those girls aren’t your toys. You won’t get away with this.
One day, as he hears the sound of a girl crying, Zenitsu immediately looks for the damsel in distress, not realizing the dangers he is about to put himself in. “What Are You?“ is an exciting episode that highlights Agatsuma’s courageous yet reckless side in times of distress and his unwavering dedication to the greater good.
5
Season 4, Episode 6: “The Strongest of the Demon Slayer Corps”
Zenitsu Trains Under Stone Hashira Gyomei Himejima
- IMDb rating: 7.3
- Arc: Hashira Training Arc
“The Strongest of the Demon Slayer Corps” is a hilarious episode filled with Zenitsu’s comical antics and his over-the-top reactions. Focused on the conditioning under Gyomei Himejima, it also explores the harsh training that the strongest Demon Slayer Corps members consistently put themselves through.

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By throwing Zenitsu into an uncomfortable circumstance, “The Strongest of the Demon Slayer Corps” delivers a perfect blend of character development and comedy that is thoroughly entertaining.
4
Season 4, Episode 7: “Stone Hashira Gyomei Himejima”
The Letter That Changes Zenitsu’s Life
- IMDb rating: 8.6
- Arc: Hashira Training Arc
As the name suggests, “Stone Hashira Gyomei Himejima” mostly revolves around the titular character’s moving backstory and the struggles that he had to contend with to become the greatest Hashira of his generation. However, it also highlights one of the most gut-wrenching moments of Zenitsu’s life that transforms him as a person and a demon slayer. This pivotal moment is unmissable as it also influences the final battle in the Infinity Castle, with far-reaching consequences.
3
Season 2, Episode 16: “Defeating an Upper Rank Demon”
Zenitsu’s Most Challenging Battle
- IMDb rating: 9.6
- Arc: Entertainment District Arc
Although not focused primarily on Zenitsu, “Defeating an Upper Rank Demon” is a top-rated episode that revolves around the epic battle in the Entertainment District. Filled with action-packed fight sequences and unexpected twists, it keeps the viewers engaged to the very end.

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The episode is special because it reveals the extent to which Zenitsu is willing to go to protect his friends and ensure that good triumphs over evil. There is perhaps no better moment in the series that comes close to showcasing how much he cares about Inosuke and Tanjiro, making “Defeating an Upper Rank Demon” a must-watch for Zenitsu fans.
2
Season 1, Episode 12: “The Boar Bares Its Fangs, Zenitsu Sleeps”
The First Glimpse of Zenitsu’s True Potential
- IMDb rating: 7.9
- Arc: Tsuzumi Mansion Arc
Accompanied by Soichi, Tanjiro and Zenitsu venture into the Tsuzumi Mansion to rescue Kiyoshi, unprepared for the challenge ahead of them. Separating soon after getting inside as the mansion turns into a maze, they realize that they must fight if they wish to survive. Zenitsu, being Zenitsu, immediately panics, not offering Shoichi any emotional support.
People don’t simply recover instantly. No matter how strong someone is, they can feel pain and sadness. But hiding from it solves nothing. You must rouse your aching heart and stand back up. I’m sure Rengoku was that kind of person.
While Tanjiro valiantly fights the Drum Demon, Zenitsu and Shoichi are cornered by the Tongue Demon. “The Boar Bares Its Fangs, Zenitsu Sleeps” focuses on the epic moment when Zenitsu falls into a deep sleep and awakens the real fighter inside him. The episode brilliantly captures Zenitsu’s duality and reveals what he is truly capable of.
1
Season 1, Episode 17: “You Must Master a Single Thing”
Zenitsu Vs. Eldest Son of the Spider Family
- IMDb rating: 9
- Arc: Mount Natagumo Arc
After getting separated from Tanjiro and Inosuke on Mount Natagumo, Zenitsu runs into the eldest son of the Spider Family. Frightened by his minions, he tries to flee but to no avail. As he finds himself in a life-and-death battle, memories of his training days rush through his mind. Zenitsu recalls the values taught by his master and the expectations he had for him. Driven by those memories, he braves his fears to put up a fight.

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“You Must Master a Single Thing” captures Zenitsu at his very best—sleeping but spiritually awakened to defeat even the most dangerous rivals in front of him. The episode offers viewers a glimpse into his roots and a taste of his true potential.
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