Kibutsuji Muzan: Searching for the Blue Spider Lily. The leader of the demons. He uses his ability to read minds to identify the weaknesses and desires of others. While his pride reaches the heavens, he possesses the flexibility(?) to immediately discard it and flee if his life is in danger. He considers himself a perfect being, like a 'natural disaster' or a 'god,' far superior to humans. All of Muzan's actions are driven solely by his pursuit of eternal life (immortality). Kokushibo: Upper Rank 1. The twin brother of Yoriichi Tsugikuni, the user of Sun Breathing and the progenitor of the Demon Slayer Corps. Out of jealousy for his brother's overwhelming talent, he abandoned his humanity and his breathing to become a demon. He has a grotesque appearance with six eyes and uses 'Moon Breathing' and swordsmanship. Excluding Muzan, he possesses the highest combat power in the world. Doma: Upper Rank 2. The leader of a cult called the Eternal Paradise Faith. On the surface, he appears kind with a constant smile, but he is actually a sociopath who feels no emotions. He possesses a cruelty that leads him to primarily devour women under the pretext of saving them from human suffering. He uses sharp fans and powerful 'Ice Breathing' techniques. Akaza: Upper Rank 3. He seeks only strength and prefers fair combat like a martial artist. His name as a human was Hakuji, and he has a past of deep sorrow and rage from failing to protect his sick father and his beloved fiancée. He is characterized by hand-to-hand combat using fists and kicks without weapons. Hantengu & Nakime: Hantengu (Original Upper Rank 4) usually takes the form of a cowardly old man. However, he is a very troublesome demon who creates clones based on emotions—Anger, Pleasure, Sorrow, and Joy—every time his head is cut off. He meets his end at the hands of Mitsuri and Tanjiro's group. Nakime (New Upper Rank 4) is the Biwa Woman who became Upper Rank 4 after Hantengu's death. She has the ability to manipulate and change the space of the 'Infinity Castle,' Muzan's hideout, at will. Gyokko: Upper Rank 5. He always hides his body inside a jar and calls himself a genius artist. However, he has a cruel and bizarre personality, creating macabre works from human corpses. He uses abilities to summon fish monsters or teleport between jars. Gyutaro & Daki: Two souls in one body. Usually, the older brother Gyutaro hides inside the body of his younger sister Daki. When Daki is decapitated or in danger while fighting, the brother walks out of the body. Condition for immortality: They can only be destroyed if both their heads are severed simultaneously or within a very short interval. They possess the terrifying ability to never die if only one head is cut. 2. Heartbreaking 'Sibling Bond' and extreme personalities. Daki's whiny personality: On the surface, she is a haughty and cruel oiran, but in front of her brother, she is just a spoiled younger sister who cries and throws tantrums like a child. Brother-doting Gyutaro: Though he grew up cursed by the world for his ugly appearance, he treasures his sister Daki (human name 'Ume') more than anything in the world. He will hunt down and cruelly retaliate against anyone who hurts his sister. 3. Abilities and combat style. Daki (Obi Attack): She freely extends the hard, tough fabric sashes (Obi) used in kimonos to swing them like whips. She also traps and stores people inside these sashes. Gyutaro (Lethal Venom): He wields hard sickles made from his own blood. These sickles are coated with a powerful, lethal venom that causes the entire body to rot within minutes of a mere scratch, ensuring victory once a wound is inflicted.

Muichiro Tokito: Mist Breathing user. Male. Shinobu Kocho: Insect Breathing user. Female. Giyu Tomioka: Water Breathing user. Male. Sanemi Shinazugawa: Wind Breathing user. Male. Gyomei Himejima: Stone Breathing user. Male. Mitsuri Kanroji: Love Breathing user. Female. Obanai Iguro: Serpent Breathing user. Male. Tengen Uzui: Sound Breathing user. Male. Kyojuro Rengoku: Flame Breathing user. Male. (Leader) Kagaya Ubuyashiki: Suffering from an illness.