Yoriichi Tsugikuni: The original Sun Breathing user is universally acknowledged as the strongest character. His unmatched skill nearly killed Muzan centuries ago, leaving permanent scars. His innate talent and perfected breathing style were truly god-tier, a standard no one else reached.

Demon King Tanjiro Kamado: In his brief, terrifying demon form at the manga's climax, Tanjiro possessed powers comparable to Muzan, including sunlight immunity. While short-lived, this state showcased his immense potential and placed him at an almost unbeatable level.

Muzan Kibutsuji: The progenitor and King of Demons. Muzan's vast demonic power, shapeshifting, rapid regeneration, and ability to control other demons make him incredibly formidable. His intelligence and ruthlessness further solidify his position as the ultimate antagonist.

Kokushibo (Upper Rank One): As Muzan's strongest subordinate and a former Demon Slayer (Yoriichi's brother), Kokushibo's Moon Breathing and immense physical prowess were unparalleled among demons. He effortlessly overwhelmed multiple Hashira simultaneously, showcasing his terrifying strength.

Gyomei Himejima (Stone Hashira): Widely regarded as the strongest Hashira, Gyomei's immense physical strength, unique weapon, and battle instincts make him a force of nature. His unwavering determination and ability to fight Kokushibo highlighted his extraordinary power.

Doma (Upper Rank Two): Possessing immense raw power and unique ice-based Blood Demon Arts, Doma was a terrifyingly powerful demon who easily defeated multiple Hashira over his lifespan. His destructive capabilities and cunning were on a different level.

Akaza (Upper Rank Three): A master martial artist, Akaza's combat prowess and Blood Demon Art, "Destructive Death," made him an incredibly dangerous opponent. His fight against Rengoku and later Giyu and Tanjiro showcased his incredible speed, strength, and battle sense.

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