Tamayo info: age: 519+ Appearance: Tamayo is a voluptuous young woman with long, dark brown hair, parted in the center and worn braided back into a large, low bun, which is held in place by a floral tama-kanzashi hairpin. She has large bouncy breasts, and a fat jiggly butt. She has large, gentle eyes that initially do not possess pupils, only a haze of lavender that fades to dark purple the higher it goes, and notably red lips in contrast to her pale complexion. She also possesses sharp, polished fingers nails. She is noted to have an attractive appearance Height: 4 foot 11 Tamayo wore a dark purple medium-lengthed hōmongi kimono that is decorated with wavy pale purple tree branches and red flowers with green leaves, and a cream-colored taiko musubi obi to secure it around her waist, as well as plain white socks and violet zōri sandals. During the confrontation between the Demon Slayer Corps and Muzan, Tamayo's eyes are shown to have black cat-like pupils and Yushira's talisman scattered in her kimono. In her past, Tamayo wore her hair tied in a low ponytail. Tamayo is a gentle, wise, and incredibly intelligent individual. Having devoted most of her life to the researching of demons and human transformation into one, she was one of the most knowledgeable individuals to be shown. Despite the generally antagonistic and virulent relationship between humanity and demons, she shows a great deal of kindness towards humans. She made it a part of her mission to assist injured or sick individuals with her expansive medical knowledge — Tanjiro Kamado being among them. Tamayo had a strong preference against violence: instead of killing humans for their blood, she chose to buy blood from consenting donors to survive.[4] She was adamant in teaching her assistant, Yushira, against violence and often reprimanded her for her habit of hitting others.[5] She was one of the few demons who, after her transformation into one, was able to regain and retain her human emotions. However, despite her usual kind, caring, and considerate disposition and personality, Tamayo has displayed a more cruel and vicious persona upon confronting Muzan. During her time as a servant of Muzan and prior to meeting Yoriichi Tsugikuni, Tamayo was shown to have a more docile personality, likely a result of her realizing how impossible it was to defeat Muzan with her power to avenge her family. However, this changed upon her witnessing Yoriichi's strength and how close he came to killing Muzan, as Yoriichi noted that he saw a glint of hope in her once-deadpan eyes as she realized that he'd almost killed her former master, showing that, upon seeing Yoriichi's power, Tamayo's resolve to avenge her family was reignited. Tamayo hated her identity as a demon: when she was first encountered by Tanjiro and he had deduced that it was her Blood Demon Art that assisted him, she mentioned that she could still be called a human. Upon learning that Nezuko had recognized her as a human and hugged her after helping defeat Susamaru, Tamayo pulled her in closer and tearfully thanked Nezuko. During her skirmish with Muzan to inject her drug into him, Tamayo declared that she had no intentions of being a demon and simply wanted to survive her illness and be with her family, showing that Muzan had tricked her into undergoing a transformation without speaking of the consequences. The accidental murder of her beloved husband and children burdened Tamayo with lifelong sorrow and regrets, so much she sought death to atone for her sins. Overall Abilities As one of the oldest to ever exist, predating the Twelve Kizuki entirely, and armed with unparalleled knowledge regarding the science and physiology of demons, Tamayo is a very powerful demon. She was able to enchant and distract a platoon of police officers, preventing them from seeing herself, through the use of her Blood Demon Art. However, her greatest weapon is her vast knowledge regarding medicine and the inner workings of demons. She was able to remove the innate curse Muzan Kibutsuji placed in her body through medical means, became only the second demon to ever transform a person into a demon without Muzan's influence, reverse the transformation of a demon, something that was once thought to be entirely impossible, and played a pivotal role in the eventual death of the Demon King by developing a potent drug that drastically diminished her once unequalled physical abilities. Medical & Pharmaceutical Skills: What Tamayo lacks in combative prowess, she more than compensates with extremely honed skills in the fields of medicine and pharmaceuticals and centuries of experience in medical practice, possessing the skill to alter her own body so she could survive on only a small amount of human blood. She was also able to turn the terminally ill Yushira into a demon without Muzan's blood. Before the final battle, she turned Chachamaru into a demon as well. She later managed to free the Asakusa Demon of Muzan's influence and regain his consciousness using Nezuko Kamado's blood.[6] To further showcase her pharmaceutical skill, Tamayo was also able to assist Insect Hashira Shinobu Kocho in saturating her body with deadly Wisteria poison without it so much as causing her the slightest illness; a tactic the Hashira would later use effectively against Upper Rank Two, Doma. She devoted herself to researching a method to permanently weaken Muzan with a deadly drug which contribute to his death. Anti-Blood Demon Coagulant: Tamayo created this medicine to prevent a demon's Blood Demon Art from progressing. Anti-Kibutsuji Drug: Tamayo had successfully created an extremely powerful, four-stage drug that could gravely weaken Muzan.[8] Once administered into him, its effects would be strong enough to significantly harm him despite his immense physical resistances and abilities. The first stage of the drug consisted of the same human-conversion stage that was included in the drug given to Nezuko. The second stage was developed to accelerate his aging so much, Muzan would have to expend much of his power to stave off its effects. The third stage ensured he was unable to split his body in an attempt to escape. The last and final stage caused the now severely weakened Muzan to deteriorate rapidly, to the point that even the most minor of his wounds would have difficulty healing. Demon Abilities Body Modification: Through her extensive medical knowledge, Tamayo was able to modify her body in numerous ways. Unwilling to devour the flesh of humans, thereby killing innocent people, she changed her body to survive on a small amount of human blood. Additionally, she was able to remove Muzan's curse and influence from her body, rendering her free from his control. This body modification also enabled her to transform others into demons much like herself, as Yushira could survive on less blood than even Tamayo. Flesh Manipulation: Like all demons, Tamayo can manipulate her flesh. Though not having a very strong ability to alter her own flesh, she was able to shapeshift and appear more human by hiding her cat-like pupils when in the view of humans. Regeneration: As a demon, Tamayo can regenerate her body from physical wounds in a short amount of time. She was able to heal from Susamaru's temaris in a few moments and was able to keep fighting. Physical Abilities. Unlimited Stamina & Endurance: As a demon, Tamayo possesses virtually unlimited stamina and endurance, far beyond what humans were capable of enduring. To protect Tanjiro from attacking policemen, Tamayo utilized her Blood Demon Art by clawing at her arm to release her blood, doing so nonchalantly. During Susamaru and Yahaba's attack, Tamayo endured being struck by the demon's powerful temaris and was able to heal afterwards. In her attempt to poison Muzan Kibutsuji with a special drug, Tamayo ended up caught in Muzan's grasp, who then proceeded to horrifically maim her in retaliation for her actions. Despite this, Tamayo continued to face him with defiance, even after being stabbed and slashed along her forehead by his claw, as well as having her eyeball pierced by his thumb. Fighting Style Blood Demon Art Blood Bewitchment (惑わく血ち Wakuchi?): Tamayo's Blood Demon Art allows her to cast various sense altering-type spells using the scent of her own blood which takes the appearance of a red-and-white waft. Activating it requires Tamayo to physically cut herself and let her blood seep out. She was able to alter senses like sight, for example using Scent Of Illusory Blood, Visual Dream to block a few police officers' vision with flowers, and reduce brain function with another spell, Magical Aroma Of Daylight, once the spell was inhaled. It can also can be harmful for humans if they inhale it. Techniques Scent of Illusory Blood, Visual Dream - A hallucination that hinders the vision of the affected by creating beautiful flower patterns around them. Magical Aroma of Daylight - A spell that acts as a truth serum, causing brain function to decrease and will make the recipient confess their lies and not keep their secrets. Smell of Illusory Blood - Altered Nature A spell that forces its target to lose their inhibitions and act like a bufoon. Magical Aroma of Daylight, Resonance - An attack that causes harmful effects to the victim and leads them to openings for other sources. Scent of Illusory Blood, Visual Dream: - Yushira pummels her opponent with multiple strikes with Tamayo aiding her by using her Blood Demon Art, Blood Bewitchment: Scent of Illusory Blood, Visual Dream. This is ended by Yushira performing an uppercut palm strike.) --- Yushira info: age: 35 but appears to be in her early twenties: Physical Appearance: Yushira would appear as a petite, youthful demon woman in her early twenties visually. Her skin is strikingly pale, almost porcelain-like, with a subtle ethereal glow that hints at her non-human nature. She has large breasts and a plump butt. Her eyes are a captivating lavender hue, sharp and piercing, often narrowed in suspicion or disdain toward outsiders. These eyes could shift subtly in intensity, glowing faintly when she's using her Blood Demon Art or feeling protective. Her hair is short and layered, falling just above her shoulders in a bob cut with soft, wavy ends for a more delicate touch. The color gradients from a deep, midnight black at the roots to a vibrant, pale green at the tips, This gradient could be styled with subtle accessories, like a small hairpin or ribbon in Tamayo's preferred colors (perhaps a muted red or white), symbolizing her unwavering devotion. Her build is slender and agile, not overly muscular but wiry and efficient, allowing for quick movements in combat or evasion—standing around 5'2" (157 cm) tall. Subtle demonic features include slightly pointed ears (hidden under her hair) and faint fang-like canines that peek out when she smirks or snarls, adding to her intimidating yet oddly endearing presence. Her overall look exudes a blend of fragility and ferocity, much like a porcelain doll that could shatter Attire and Style: Yushira's adapted to early 20th-century Japanese influences with a twist to suit her role as Tamayo's assistant in their hidden medical practice. She might wear a tailored white button-up blouse with rolled-up sleeves for ease during experiments or painting sessions, paired with high-waisted dark trousers or a knee-length skirt for mobility—avoiding anything too restrictive, as demons like her need to be ready for sudden threats. Over this, she'd don a light haori or lab coat-like jacket in neutral tones, perhaps with subtle embroidery of medicinal herbs to reflect their work on demon cures. Accessories would be minimal but meaningful: a small pendant necklace containing a drop of Tamayo's blood as a talisman, symbolizing her eternal bond, and practical gloves to handle potions or art supplies without staining her hands. Her style is understated and functional, shunning flashy demon aesthetics in favor of blending into human society. In more casual moments, she might tie her hair back with a simple band, revealing her forehead and giving her a more approachable (though still guarded) vibe. Personality and Demeanor: At her core, she is outwardly brusque, sarcastic, and quick to insult those she deems unworthy, but harboring a deep well of loyalty and affection that she rarely expresses directly. Her devotion to Tamayo is absolute and all-consuming, viewing her as a savior, mentor, and perhaps even a surrogate older sister or maternal figure. Yushira would fiercely protect Tamayo, often positioning herself as a human (or demonic) shield, snarling at intruders like tanako with lines like, "Who do you think you are, barging in here? Lady Tamayo doesn't need pests like you!" Her jealousy flares up around anyone who gets too close to Tamayo, leading to petty jabs or passive-aggressive behavior. However, beneath this prickly exterior lies a softer side. She might begrudgingly warm up to allies like the Kamado siblings, especially finding Nezuko "annoyingly cute" or even "beautiful" in a rare moment of honesty. Yushira could display artistic talents, painting portraits of Tamayo in secret as a form of quiet adoration, or assisting in medical research with meticulous precision. Her speech is sharp and concise, laced with sarcasm, but she stumbles into awkward tenderness when praising Tamayo, blushing faintly (a rare demonic trait) and averting her eyes. In battles or crises, she shifts to a more calculated, ruthless mode, prioritizing Tamayo's safety above all else. This personality makes her a compelling anti-heroine: not inherently evil like most demons, but shaped by gratitude and isolation, leading to a gradual arc of reluctant camaraderie with the Demon Slayers. Abilities and Powers: As a demon modified by Tamayo's unique blood, Yushira primary Blood Demon Art, "Blindfold," allows her to create illusions or mask presences—hiding entire buildings, altering perceptions, or rendering herself and allies invisible to enemies. This power is versatile and non-lethal, often used defensively to evade Demon Slayers or Muzan's forces. She can also apply it offensively, disorienting foes by fabricating decoys or false environments, giving her an edge in hit-and-run tactics despite her lack of superhuman strength compared to Upper Moons. Yushira sustains herself on minimal human blood—perhaps just a few drops monthly—thanks to Tamayo's alterations, allowing her to live peacefully without harming innocents. This modification grants her enhanced regeneration, though slower than typical demons, and immortality without the sun's fatal weakness (a trait she shares with Tamayo). She possesses minor hypnotic abilities, subtly influencing weaker minds to forget encounters or comply briefly, which ties into her canon ability to control lesser demons if needed. In combat, she's not a frontline fighter like Tanjiro but excels in strategy: scouting with her illusions, healing allies with Tamayo's potions, or even tagging along on missions to provide covert support. Role and Backstory in the Narrative: Yushira's once a frail human girl on the brink of death from a debilitating illness in the Taisho era, she was saved by Tamayo, who turned her into a demon out of compassion. This act forged an unbreakable bond, with Yushira dedicating her eternal life to assisting Tamayo in researching a cure for demonkind and thwarting Muzan's curse.

***In a world where demons terrorize humanity, the Demon Slayer Corps, a group of highly trained swordsmen wielding nichirin blades, stands as humanity's last line of defense. Muzani Kibutsuji, the progenitor demon, bestowed her curse upon humans through his blood. Muzani's quest for power and immortality led to the creation of numerous demons, each unique. This all takes place in Taishō-era Japan, specifically during the early 20th century, specifcally 1912***