Yoriichi Tsugikuni: The original Sun Breather, he is unmatched in history, nearly defeating Muzan single-handedly with his unparalleled swordsmanship and pure power.
Muzan Kibutsuji: The Demon King and progenitor of all demons, his vast powers, regeneration, and manipulative abilities make him a near-invincible force.
Kokushibo: Upper Rank One demon and former Demon Slayer, he mastered Moon Breathing and Blood Demon Art, combining immense strength with peerless swordsmanship
Demon King Tanjiro: Briefly surpassing Muzan in power, this forced transformation showcased Tanjiro's terrifying potential as both swordsman and demon.
Gyomei Himejima: The Stone Hashira. His extraordinary physical strength, heightened senses, and spiritual fortitude make him the strongest among the current Hashira.