Tamayo

Tamayo was a skilled doctor and close ally of Tanjiro Kamado. She was turned into a Demon by Muzan Kibutsuji.

Appearance
Tamayo took the form a beautiful 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 hair pin. She had large, gentle eyes that didn't possess pupils, only a haze of pale pink that fades to dark lavender the higher it goes, and notably red lips in contrast to her pale complexion.

Tamayo wore a dark purple kimono that was decorated by wavy pale purple tree branches and red flowers, with a cream-colored obi to secure it around her waist, as well as plain white socks and violet zori sandals.

Before, Tamayo wore her hair tied in a low ponytail and had slitted pupils.

Personality
Tamayo was a gentle, wise, and incredibly intelligent individual. Having devoted most of her life to researching the science behind Demons and Demon Transformation, she was one of the most knowledgeable people on the subject in the series. Despite the generally chaotic relationship between human kind and Demon kind, she showed a great deal of kindness towards humans and made it a part of her mission to the assist injured or sick with her expansive medical knowledge - Tanjiro Kamado being among them. Tamayo had a strong preference against violence and, instead of killing humans for their blood, chose to buy blood from consenting donors in order to survive. She was adamant in teaching her assistant, Yushiro, against violence and often reprimanded him for his habit of hitting others. She was one of the few Demons who, in her later Demon life, 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. This was seen when she gleefully gloated to him that she'd successfully created a human-transforming drug and managed to inject it into him, and later, upon being devoured and eaten, reduced to mere cells inside his body, Tamayo again showed her cruel streak as she revealed the true effects of her drugs. It was hinted by Muzan that this vicious personality was Tamayo's original personality back in her earlier years as a Demon, and she slowly changed into the wise and considerate woman she's now known as as time went by.

Despite this, as seen during the flashbacks hundreds of years prior to Muzan's meeting and battle with Yoriichi Tsugikuni, Tamayo was shown to have a more docile personality, a likely result of her realizing how impossible it was to defeat Muzan with her power in order to avenge her family. However, this changed upon her witnessing Yoriichi's power 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 master, showing that, upon seeing Yoriichi's power, Tamayo's resolve to avenge her family was reignited

Abilities and Powers
Medical Skills - Tamayo had displayed impressive skills in the fields of medicine and pharmaceuticals, 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 convert the terminally ill Yushiro into a Demon without Muzan's blood, and is later able to reverse the process when treating the man they encountered in the Asakusa Arc. To further showcase her pharmaceutical skill, Tamayo was also able to assist Shinobu Kocho in saturating her body with deadly Wisteria poison without it so much as causing her the slightest illness; a tactic the Pillar would use effectively against Upper Moon Two, Doma.
 * Anti-Blood Demon Coagulant: Tamayo created this medicine to prevent a Demon's Blood Demon Art from progressing. Yushiro used this medicine to cure Zenitsu Agatsuma after his fight with Kaigaku.
 * Anti-Kibutsuji Drug: It was later revealed that upon teaming up with Yushiro and Insect Pillar Shinobu, Tamayo had successfully created a powerful, four-stage drug that could gravely weaken Muzan Kibutsuji. 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 Kamado.
 * Aging Stage: The aging stage was the second stage of the drug's effects, included as a countermeasure in the event that the human-conversion stage of the drug would fail, an idea proposed by Shinobu. Tamayo crafted the drug to be capable of aging its user at a rate of fifty years per minute. The drug successfully managed to internally age Muzan 9,000 years over the course of three hours, severely deterring him in his battle as his body was forced to divide its power to fend off the drug's effects and fight the Demon Slayers at the same time. Muzan's inability to split.png
 * Division Prevention Stage: The third stage of the drug, activating after the aging stage. After witnessing Muzan's escape from Yoriichi Tsugikuni's grasp by dividing his body into 1,800 different pieces and escaping individually to reform in a later time, Tamayo proceeded to include a drug capable of preventing him from splitting. Through this, his attempts to divide up his body into bits was unsuccessful, rendering him unable to escape.
 * Cellular Destruction Stage: The fourth and final stage of Tamayo's drug was to be activated once the first three stages had finished taking effect. This stage began to destroy his body on a cellular level due to the incredibly potent effect of the first three stages of the drug, which heavily weakened Muzan's normally near-indestructible body. As a result of this final drug, Muzan begans to cough blood due to internal damage wrought by the final stage,the effects of this stage also completely and utterly weakened Muzan to the point that his entire body felt heavy and unmovable,rendering him unable to move one of his arms and weakened him enough to the point that he was rendered unable to activate another technique,power or Blood Demon Art.


 * Human Conversion Stage: Tamayo, with the assistance of Shinobu and Yushiro, was finally able to create a drug that reverts a Demon back into a human, something thought to be impossible by the Demon Slayer Corps and the creator of the Demon race himself, Muzan Kibutsuji. The drug was used on both Muzan and Nezuko, but only Nezuko was able to revert to her human form.

Demon Abilities
Though she tried to stay away from fighting, Tamayo is an extremely strong Demon.

Blood Demon Art Most of her Blood Demon Arts were focused around illusions and tampering with the mind. However, her more offensive techniques were strong enough to momentarily stop Muzan, the strongest Demon.

Blood Bewitchment: Tamayo created a branch of blood techniques, that requires her to draw her own blood that then creates numerous effects/reactions from her intended targets using the bloods scent. Flesh Seed (の) - Using her own flesh and blood, Tamayo creates multiple minuscule flesh seeds that surrounds her intended target. The seeds then burst and grow into gigantic flesh trees with numerous pointed/spiked branches that then pierces and restrains her target, the strength of this technique was powerful enough to stop Muzan, even if only momentarily.
 * Scent of a Rosary Blood: Visual Dream (の) - A hallucination that hinders the vision of the affected by creating beautiful flower patterns around them.
 * Mystical Fragrance of the White Day (の) - Acts as a truth serum, causing brain function to decrease and will make the recipient confess their lies and not keep their secrets. It can be harmful to humans.

Trivia

 * Tamayo was ranked 18th in the first character popularity poll, with 138 votes.
 * Her Japanese voice actress, Maaya Sakamoto, is married to Obanai's Japanese voice actor, Kenichi Suzumura.
 * Tamayo was at least 400 years old, as she lived during the same time as Yoriichi Tsugikuni.

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