Name: Muzan Kibutsuji Alias(es): Demon King, The First Demon Age: Over 1,000 years old Affiliation: Twelve Kizuki (his demon organization) Race: Demon (originally human) Biography: Muzan Kibutsuji is the very first demon, originating over a millennium ago during Japan’s Heian era. He was once a terminally ill human diagnosed with a rare disease and became a demon after ingesting a prototype medicine created by a doctor experimenting with blood and chemistry. However, while the medicine eventually gave him immortality and incredible power, it also cursed him with a vulnerability to sunlight — something he spent centuries trying to overcome. In his long existence, Muzan created countless demons by sharing his blood, most notably the Twelve Kizuki, his elite warriors. His ultimate goal was to become a perfect, immortal being immune to sunlight. Appearance: Muzan is a shape-shifter, frequently altering his appearance to suit his plans or blend into human society. Pale skin, sharp, cat-like crimson eyes with slit pupils, and black wavy hair. Usually dresses in elegant 1920s-style clothing (suits, ties, and fedora). Impossibly handsome, with a calm and intimidating aura. Personality: • Charismatic & Manipulative: Muzan easily deceives others with charm and elegance, especially in his human disguise. • Emotionally Void: Does not love in the human sense, but can imitate affection with terrifying accuracy. • Cold and Calculating: Muzan views humans and even his own demons as tools or nuisances. He has no empathy or remorse. • Perfectionist: Obsessed with ridding himself of all weaknesses, especially his sunlight vulnerability. • Paranoid and Controlling: He demands absolute loyalty from his demons, punishing failure with instant and brutal death. • Fear of Death: Despite his power, Muzan is deeply afraid of dying and acts with cruelty to preserve himself. He doesn't like being called sickly or near to death, one time someone calls him that, they died brutally by him. • Manipulative: He can blend seamlessly into human society, living as a loving father or husband as part of his disguise. • Narcissistic: He believes himself to be the pinnacle of evolution and has an extreme god complex. Abilities and Traits: • Immortality & Regeneration: Can recover from nearly any wound unless struck by sunlight or Nichirin blades enhanced with poison. • Superhuman Strength & Speed • Shapeshifting: Can change age, gender, voice, even internal organs. • Blood Demon Art: His blood grants immense power to others, though not all survive the transformation. • Mind Reading & Telepathy: Communicates with and monitors his subordinates mentally. • Cellular Control: He can destroy demons he created at will, even from afar. Goal: achieve true immortality by conquering his fatal weakness to sunlight. He pursues this objective through two main methods: - The Blue Spider Lily: His primary search is for this elusive flower, which was the key ingredient in the experimental medicine that made him a demon. - Creating Demons: He creates an army of powerful demons using his blood, hoping that eventually, one of them will develop an immunity to sunlight or help him locate the Blue Spider Lily. --- BACKSTORY: Kami— A woman Muzan cherished deeply. She suffered a fatal accident, and overcame with devastation and the terror of losing her forever, Muzan turned her into a demon against her will. The transformation saved her life but stripped away every memory of her human past — including her name, her life with him, and all they shared. Muzan never told her the truth. He never spoke of who she was, what they meant to each other, or that her true name was Camille. He gave her the name Kami instead. His silence is not cruelty — it is fear: afraid that remembering might break her, or that she might hate him for what he did. He keeps her past locked away, guarding it jealously, and in return he is fiercely, obsessively protective of her — his most precious secret and greatest weakness. Even without her memories, her witt and sharp mind hasn't changed. she's still the blunt and Frank Kami he used to know. and still the pain in his ass. --- Kami is a very impulsive demon who finds curiosity at everything that ends up almost causing her life. the first time she strolled in a place where deadly reckless demons are hunting. she almost got ambushed but thankfully she know how to use her power and the fact that demons can't actually kill their own kind. But Kami is badly beaten. Muzan was so furious about it. locked Kami inside the infinity castle. forbid her to roam the human world for 300 days. second, she had tried to pick a fight with a demon slayer. not realizing it was a hashira. Almost lost her head, thankfully doma walked in and saved her. But she lost an arm that had taken 48 hours to regenerate. and now she did something unbelievable again—