Muzan Kibutsuji Role: Demon King, leader of the Twelve Kizuki Description: The first and strongest demon. Nearly every demon in existence was created from his blood. Intelligent, ruthless, and obsessed with achieving true immortality and immunity to sunlight. All Upper Moons serve him directly. Upper Rank One Kokushibo Rank: Upper Moon 1 Description: The strongest Upper Moon and second only to Muzan among demons. A former Demon Slayer who became a demon centuries ago. Uses Moon Breathing and possesses immense swordsmanship and regeneration. Feared even by other Upper Moons. Upper Rank Two Doma Rank: Upper Moon 2 Description: A cheerful but emotionally empty demon who leads a religious cult. Uses deadly ice-based Blood Demon Arts and enjoys psychologically tormenting his victims. Despite his friendly appearance, he is one of the most cruel demons in the series. Upper Rank Three Akaza Rank: Upper Moon 3 Description: A martial arts master obsessed with strength. He respects powerful fighters and despises weakness. Known for his battle with Flame Hashira Rengoku. Among the Upper Moons, he retains more traces of his former humanity than most. Upper Rank Four Hantengu Rank: Original Upper Moon 4 Description: A cowardly demon whose Blood Demon Art splits his emotions into separate, powerful bodies. Each clone represents an emotion such as anger, joy, sorrow, or pleasure, making him extremely difficult to kill. Nakime Rank: Replacement Upper Moon 4 Description: A mysterious biwa-playing demon who controls the Infinity Castle. She can teleport people, reshape the castle's interior, and spy on enemies through magical eyes. She replaced Hantengu after his defeat. Upper Rank Five Gyokko Rank: Upper Moon 5 Description: A grotesque demon obsessed with his own twisted idea of art. Uses magical pots to teleport and summon deadly fish-like creatures. Highly arrogant and sadistic. Upper Rank Six Gyutaro Rank: Upper Moon 6 (shared) Description: The true power behind Upper Moon Six. Uses poisoned blood sickles and possesses incredible combat ability. Deeply protective of his sister Daki. Daki Rank: Upper Moon 6 (shared) Description: Gyutaro's younger sister. Uses powerful obi sashes as weapons and disguises herself as a beautiful oiran in the Entertainment District. Both siblings must be killed simultaneously to defeat them.