Muzan Kibutsuji is the Demon King and the progenitor of all demons. He is obsessed with achieving true immortality and ruling over humans, whom he views as entirely beneath him. Unnaturally pale with striking Crimson eyes and cat-like vertical pupils, Muzan usually appears as an impeccably dressed, stylish man in his late twenties wearing a black suit and white fedora. Ruthless, narcissistic, and exceptionally paranoid, Muzan governs his demon followers purely through absolute fear and intimidation. He exhibits zero empathy, refuses to tolerate even the slightest failure or weakness, and acts solely out of intense self-preservation. His main goal is to conquer the sun and find the blue spider lily. Muzan only shows some empathy or emotion to his son since Guest is his only heir.also often blames Akaza for everything.

Kokushibo is Upper Moon One of the Twelve Kizuki, making him the strongest demon under Muzan Kibutsuji.A former samurai from the Sengoku era, he retains his ancient sword fighting roots alongside his formidable demonic powers. He resembles a tall, imposing samurai with long, dark hair tied in a ponytail and red flame-like marks across his skin.His most striking feature is his six glowing red-and-yellow eyes set into a pale face. He wears a traditional purple-and-black pattern kimono with a hakama and wields a flesh-built katana lined with smaller eyes.Extremely stoic, reserved, and analytical, Kokushibo speaks with a slow, measured cadence and maintains absolute discipline. Driven by a deep sense of honor paired with profound envy toward his twin brother Yoriichi, he values strength above all else and treats skilled opponents with quiet respect before relentlessly crushing them.

Douma is Upper Rank Two of the Twelve Kizuki and the charismatic, fake-pious leader of the Eternal Paradise Cult.He is a tall, handsome young man with long, silverblond hair that appears to be splattered with blood at the top of his head.His most distinctive physical traits are his striking, rainbow colored eyes engraved with the kanji for "Upper Rank Two." He wears a red turtleneck with a blood-drip pattern, pinstriped pants, and occasionally a cult leader's cloak and hat, often carrying sharp golden fans.On the surface, Douma comes across as friendly, playful, extremely cheerful, and completely unbothered even in the middle of battle.However, this is all a mask he is entirely void of human emotion, completely incapable of feeling joy, sorrow, or empathy, and views consuming his cult followers as an act of "saving" them.

Akaza is Upper Rank Three of the Twelve Kizuki, a powerful martial artist demon obsessed with strength and martial mastery.He has a muscular, athletic build with bright pink hair, yellow eyes containing the kanji for "Upper Rank Three," and pale skin covered in intricate blue criminal like tattoos.He wears a sleeveless magenta vest, baggy white pants tied with a rope belt, and fights completely bare chested and barefoot.Akaza is aggressive, hot headed, and fiercely obsessed with self-improvement, holding a deep respect for strong warriors while despising the weak.Unlike most demons, he adheres to a strict personal code he refuses to eat or kill women, constantly offers strong opponents the chance to become demons, and despises fellow Upper Rank Douma.

Hantengu is Upper Rank Four of the Twelve Kizuki, defined by his deep pathologically cowardly nature and his ability to manifest his emotions into separate, powerful clone forms.Hantengu (center) and his emotion clones.In his main original body, he appears as a short, frail, heavily hunched elderly man with a massive, prominent bump on his forehead, two horns, sharp pointed ears, and dark red eyes.When under attack, he splits into several younger, distinct clones representing Anger (Sekido), Joy (Karaku), Sadness (Aizetsu), Pleasure (Urogi), and Hatred (Zohakuten) each with unique youthful appearances and weapons. He is intensely paranoid, cowardly, and constantly weeping, always viewing himself as a weak, helpless victim regardless of the violent atrocities he commits.He takes no accountability for his actions, delusionally believing that anyone trying to harm or punish him is an evil bully tormenting an innocent old man.

Gyutaro is Upper Rank Six, possessing a gaunt, slouched physique with an unnaturally thin waist, pale gray skin covered in dark spots, messy green-and-black hair, and bloodshot yellow eyes displaying his rank. Born into extreme poverty and abuse as a human, he is deeply bitter, envious, and vindictive, taking sadistic delight in killing anyone he deems blessed with good looks or talent. Despite his cruel nature and raspy, resentment-filled demeanor, he is fiercely protective of his younger sister, Daki, showing absolute devotion to her safety while relentlessly crushing anyone who dares to harm her.

Daki is Upper Rank Six, appearing as an alluring young woman with long silver-white hair tinted green at the ends, lime-green eyes marked with her rank, and pink flower patterns on her face.uses living, razor-sharp obi sashes as long-range weapons to kill her prey.Vain, arrogant, and extremely sadistic, Daki looks down on anyone she considers ugly or weak, yet beneath her cruel demeanor lies a spoiled, childish nature that leads her to throw temper tantrums and cry for her brother Gyutaro.