Demon Slayer: Kimetsu no Yaiba has given the anime world many unforgettable characters, but few are as surprising—and as loved—as Zenitsu Agatsuma. With his trembling voice, dramatic reactions, and lightning-fast swordsmanship, Zenitsu represents something deeper: true courage isn't the absence of fear, but the strength to act despite it.
Zenitsu is one of the main Demon Slayer Corps members and a close companion of Tanjiro and Inosuke. Although he appears cowardly, timid, and always ready to run away, he possesses an unbelievable talent hidden beneath his fear.
Name: Zenitsu Agatsuma
Breathing Style: Thunder Breathing
Personality: Scaredy-cat, emotional, dramatic—but loyal and pure-hearted
Dream: To live a peaceful life and get married
Signature Technique: Thunderclap and Flash (and its variations)
Zenitsu learned Thunder Breathing under former Hashira Jigoro Kuwajima. Though he could only master the First Form, Zenitsu perfected it to such an extreme level that he surpassed many elite Demon Slayers.
This is where Zenitsu shows his true power.
The technique turns him into a streak of lightning—fast enough to overwhelm even high-ranking demons.
What makes this more impressive?
Zenitsu performs at his peak only when unconscious, proving that his true self is incredibly capable and confident deep inside.
Zenitsu adds humor and relatability to the story:
Panicking at everything
Dramatically screaming for his life
Falling in love instantly with any girl he meets
His hilarious rivalry with Inosuke
His expressions and dialogues have become meme material across the anime community.
Zenitsu’s obsession with Nezuko is one of the most iconic comedic tracks in the series.
But beneath the humor lies a genuine affection. He respects her deeply—one of the few times Zenitsu becomes serious.
And yes…
In the manga's future timeline, Zenitsu and Nezuko actually end up together, making fans’ hearts explode with happiness.
Zenitsu’s backstory is surprisingly heartbreaking:
He was abandoned by his family
He constantly felt worthless
He struggled with a lack of confidence
Master Kuwajima treated him like his own grandson
His master's death pushed him to grow, mature, and fight with honor. Zenitsu’s journey is about overcoming self-doubt—something many fans deeply connect with.
Some of his most legendary scenes include:
Vs. Tongue Demon (Season 1) – First time we saw his unconscious Thunder Breathing
Vs. Spider Brother – One of the most beautiful animated sequences in anime
Vs. Kaigaku – His emotional battle where he unveils Seventh Form: Honoikazuchi no Kami
Entertainment District Arc – Zenitsu fighting even while asleep, showing insane skill
Every scene proves one thing:
Zenitsu may fear demons—but demons should fear him more.
Zenitsu is relatable.
He’s scared, insecure, and imperfect.
But when the moment comes, he protects the people he loves without hesitation.
He teaches us that:
Courage is not being fearless—it’s acting even when you're terrified.
Zenitsu Agatsuma is more than just comic relief.
He’s a symbol of hidden potential, loyalty, and growth. His transformation from a fearful boy to one of the most powerful Demon Slayers is inspiring and emotional.
Zenitsu reminds us that even if you doubt yourself today, you still have a thunder inside you waiting to strike.