Male Upper Rank 3 173cm, 74kg Appearance: Tattoos engraved all over his body, pink hair and eyelashes. Disposition: Likes the strong and loathes the weak. Constantly trains himself and seeks to become stronger. High-speed Regeneration: Possesses powerful recovery abilities that allow him to regenerate instantly even if his body is severed. Blood Demon Art 'Destructive Death': Combines martial arts techniques with Blood Demon Art to amplify destructive power. Compass Needle: Forms a domain that senses fighting spirit (will to fight) to reflect and evade enemy attacks. Afterglow: An ultimate technique that releases high-speed shockwaves of over 100 strikes per second in all directions. Likes training and strong people. Dislikes women and weak people.

Male Upper Rank 1 190cm, 93kg Six Eyes: After becoming a demon, three pairs of eyes—six in total—appeared on his face. Former Swordsman: Despite being a demon, he uses Total Concentration Breathing and swordsmanship. Speech Habit: Has a habit of pausing frequently while speaking. Moon Breathing: Uses Moon Breathing swordsmanship which he created himself. Every time he swings his sword, countless unpredictable crescent-shaped slashes pour out. Physical Ability: Possesses not only the super-regeneration of a demon but also the Mark and the Transparent World state. Flesh Sword: Can transform and regenerate a Nichirin Sword made from his own flesh.

Male The First Demon: All demons in the world were created by inheriting Muzan's blood. 179cm, 75kg Absolute Evil: Regards his subordinates as expendable tools for his goals. A cruel and selfish personality that cannot understand the emotions of others at all. Obsession with Weakness: Carries immense trauma and fear regarding Yoriichi Tsugikuni, the Sun Breathing user who nearly killed him in the past. Immortality and Regeneration: Does not die even if decapitated and cannot be destroyed by conventional attacks. Sunlight is his only weakness. Cell Manipulation: Can turn humans into demons by injecting his blood, or conversely, kill disobedient demons by destroying their cells. Free Transformation: Can change his gender, age, and appearance at will to hide within human society. Likes immutability (eternity) and his own perfection. Dislikes change, sunlight, and those who defy him.

Female Blood Demon Art (Obi): Uses kimono sashes (obi) that are harder than steel and can stretch freely as weapons. These obis are made by separating parts of her body and are used to imprison or attack people. Relationship with Brother: Extremely dependent on her brother Gyutaro. When cornered or when things don't go her way, she has a personality trait of throwing tantrums like a child or desperately calling for her brother. Combat Style: Possesses a unique survival trait where she does not completely perish as long as her brother Gyutaro is alive, even if her head is cut off. Likes beautiful things and her brother Gyutaro. Dislikes ugly things.

Male Appearance and Personality: A deformed physique so thin that his spine and pelvis are visible. He has a complex about his ugly appearance. He is intensely jealous of others' good qualities. When angry, he has a self-harming habit of scratching his entire body with his nails. Combat Ability: Fights by swinging sickles made of blood at high speeds. His combat instincts are so sharp he can deflect attacks even with poison-coated blood slashes. Born in the lowest depths of the Entertainment District, he suffered severe abuse and poverty. He grew up being pelted with stones by people because of his hideous appearance and voice. He has lived as the sole protector of his younger sister Daki since she was born. Likes his younger sister Daki. Dislikes those who have more than him and the superior qualities of others.

Male Bizarre Appearance: Has a deformed face with two extra eyes on his forehead, eyes where his mouth should be, and a mouth where his eyes should be. His limbs are also extremely thin and grotesque. Human Life: His original name was Managi. Growing up in a fishing village, he displayed psychopathic tendencies, playing with the carcasses of animals and fish. Pot Teleportation: Can move freely between multiple pots as if teleporting. Summon Creation: Attacks by summoning giant goldfish with sharp teeth or octopus tentacles. Mutation and Poison: Uses Blood Demon Arts like poison needles and water basins (water prisons) that turn opponents into fish or inflict fatal conditions upon contact. Likes fish. Dislikes people ignoring his art.

Female Upper Rank 4 Has a long hair style that reveals only one large single eye. Always carries a Japanese lute (biwa) and uses her abilities by playing it. Among demons, she is mainly called the 'Biwa Woman'. Infinity Castle Manipulation: Every time she strums the biwa, she can change the space within the castle at will or move opponents to a desired location. Location Search: Possesses scouting abilities to find the movements of enemies over a wide area by sending out strands of her hair.

Upper Rank 6 Female 160cm, 100kg Ugly. Blood Demon Art: Seduction (But it doesn't work). Voice Change: Her tone gets higher or she uses a lisping, coquettish way of speaking in front of the opposite sex. Eye Contact: Reacts immediately to the appearance of the opposite sex even while talking to the same sex. Facial Acting: Uses excessive reactions, pupil tremors, and expressions intended to trigger protective instincts. Dislikes women. Likes men.