The anime world is vast and full of incredibly powerful characters, each with unique abilities that define their strength within their respective universes. When a question like "Is Rem stronger than Zenitsu Agatsuma?" arises, it sparks fascinating discussions among fans. However, making a definitive comparison between characters from entirely different fictional realms—like Rem from Re:Zero - Starting Life in Another World and Zenitsu Agatsuma from Demon Slayer: Kimetsu no Yaiba—is inherently challenging. Their power systems, environmental contexts, and adversaries are so distinct that a direct "who would win" scenario often boils down to speculation.
Instead of trying to force an impossible direct comparison, this super pillar hub aims to provide a comprehensive, human-first overview of Zenitsu Agatsuma's strength within his own universe. By deeply understanding Zenitsu's unique abilities, his growth, and how he stacks up against the formidable foes and allies of the Demon Slayer Corps, we can truly appreciate his power. This way, while we can't definitively pit him against Rem, we can fully grasp the incredible force that Zenitsu represents.

Zenitsu Agatsuma: The Roaring Speed of Thunder Breathing

Zenitsu Agatsuma stands out as one of the most memorable and unique characters in Demon Slayer. Often depicted as a timid and easily frightened individual, his true strength emerges under specific, often unconscious, circumstances. It's in these moments that he transforms into a lightning-fast warrior, showcasing incredible speed and agility that few can match. His journey is one of overcoming fear and embracing a specialized, potent form of combat.

Mastery of Thunder Breathing's First Form: Godspeed Unleashed

Zenitsu's primary weapon in his fight against demons is his mastery of the Thunder Breathing style. While he famously only managed to learn and perfect the First Form, 'Thunderclap and Flash' (Hekireki Issen), his proficiency with it is absolutely unparalleled. This technique allows him to execute incredibly fast, precise dashes, making him a blur to his enemies.
What truly elevates his combat prowess is Godspeed (Shinsoku), a heightened version of his First Form. When Zenitsu activates Godspeed, his reflexes and movement speed are pushed to their absolute limits, granting him a burst of acceleration that can rival, if not surpass, some of the fastest demons. This technique, though taxing and limited in uses, allows him to defeat Lower Rank demons swiftly and decisively, often before they even realize what hit them.

Beyond the First Form: Zenitsu's Latent Talent and Growth

Despite his initial limitations in mastering only the First Form of Thunder Breathing, Zenitsu's inherent talent is undeniable. His ability to perform a single, foundational technique with such perfection and speed speaks volumes about his natural aptitude as a Demon Slayer. Throughout his journey, he continuously develops, demonstrating growth and an expanding understanding of his unique fighting style.

The Demon Slayer Mark: Unlocking New Heights of Power

The world of Demon Slayer introduces concepts like the Demon Slayer Mark, a mysterious physiological phenomenon that significantly enhances a slayer's physical capabilities, speed, and overall power. While not all Demon Slayers awaken this mark, its existence signifies a path to reaching peak potential. For characters like Zenitsu, who possess immense latent talent, the Demon Slayer Mark represents an ultimate unlock, promising an even greater leap in strength and combat effectiveness should he fully awaken and utilize it. His capacity to defeat formidable Lower Rank demons alone already highlights a burgeoning power that can only expand further.

Power Dynamics: Who Outranks Zenitsu in the Demon Slayer World?

While Zenitsu is undoubtedly a powerful and crucial member of the Demon Slayer Corps, especially given his specialized speed and technique, it's important to understand his place within the broader hierarchy of the Demon Slayer universe. There are numerous characters, both human and demon, who clearly operate on a different tier of strength, showcasing the vast spectrum of power in this world.

The Unmatched Might of the Hashira

At the pinnacle of the Demon Slayer Corps stand the Hashira, the nine highest-ranking and most skilled swordsmen. Their combined experience, mastery over their breathing styles, and sheer physical prowess far exceed Zenitsu's current capabilities. They are individuals who have faced and defeated Upper Rank demons, proving their mettle countless times.
For instance, Gyomei Himejima, the Stone Hashira, is widely regarded as the strongest among them, wielding immense physical power and a unique fighting style. Sanemi Shinazugawa, the Wind Hashira, is known for his aggressive fighting style, incredible speed, and relentless attacks. Then there's Obanai Iguro, the Serpent Hashira, who created his own breathing style and possesses extraordinary reflexes and unpredictable footwork. All Hashira possess physical capabilities, combat experience, and advanced breathing techniques that are a league above Zenitsu.

The Ancient Terror of the Upper Rank Demons

On the demonic side, the Upper Rank Demons of the Twelve Kizuki represent an ancient and terrifying level of power. These demons have lived for centuries, accumulating vast combat experience and developing unique, devastating Blood Demon Arts.
Akaza, Upper Rank Three, is a master of unarmed combat, boasting incredible destructive power, instant regeneration, and centuries of fighting knowledge. Even more formidable is Kokushibo, Upper Rank One, a former Demon Slayer and a master swordsman who created his own devastating Moon Breathing style with sixteen distinct forms. These demons combine unparalleled physical attributes with centuries of accumulated combat wisdom and terrifying abilities, making them far superior to Zenitsu.

The Pinnacle of Power: Muzan Kibutsuji and Yoriichi Tsugikuni

Beyond the Hashira and Upper Ranks, stand two characters whose power levels are in a league of their own:

  • Muzan Kibutsuji: The progenitor of all demons, Muzan is the ultimate antagonist. He possesses a vast array of abilities including shapeshifting, instant regeneration, the power to create new demons, and over a millennium of combat experience. He is, without a doubt, the most powerful demon in the series.
  • Yoriichi Tsugikuni: A legendary swordsman from the Sengoku Era, Yoriichi is considered the strongest character in the history of Demon Slayer. He created the first breathing style, Sun Breathing, and was the only individual in history who came close to killing Muzan in battle over 400 years ago. His power remains unmatched by almost any other character.

Tanjiro Kamado: Surpassing Limits by Series End

Even among his peers, Tanjiro Kamado, the series' protagonist, eventually surpasses Zenitsu in overall power by the story's conclusion. Tanjiro activates the Demon Slayer Mark, masters various forms of the Sun Breathing technique (even developing the elusive 13th form), and gains the ability to perceive the Transparent World. His growth arc leads him to a level of power that allows him to directly contend with the strongest demons, ultimately placing him beyond Zenitsu's final capabilities as depicted.

Ultimately, comparing Zenitsu to characters like Rem from other anime requires a leap of faith across different fictional realities. However, by focusing on his role within Demon Slayer, we see Zenitsu Agatsuma as a character of immense potential and specialized strength. He is a master of speed and precision, capable of taking down formidable foes, yet he still stands on a journey of growth, with individuals of truly legendary power, both human and demon, towering above him in the Demon Slayer Corps. His unique blend of cowardice and unconscious courage makes him a compelling figure, and his journey to unlock his full potential continues to captivate fans.