You humans are so miserable. No matter how hard you try, this is all you got. How unfortunate.
Daki is a tall, fair-skinned woman with large, lime green eyes with long eyelashes. Her hair is white with a lime green ombre at the bottom and is styled in a full, long ponytail and with kanzashi hairpins (three on each side) holding up the ponytail. she gains a pink flower-like tattoo on her face, and wears a revealing two-piece version of her kimono consisting of magenta pink panties tied by long, black bows on the sides and with two magenta pieces of cloth that cover her bust. She has magenta thigh-high stockings with black flower patterns and tall three-legged koma-geta/mitsu-ashi shoes.
When she is first introduced as a Warabihime, she appears to abide to the characteristics of the oiran style, her hair being the typical date-hyōgo style having numerous Ōgi bira kanzashi both decorating and supporting it as well as wearing traditional makeup. She wears a layered kimono with different flower patterns on it, keeping fragments of her Blood Demon Art as her obi.
Before she turned into a demon, Daki was a young girl with long, disheveled white hair with messy bangs along with dark lipstick. She wore a torn, light kimono with an irregular square patterns with a horizontal lines across it.
Daki is a very prideful and sadistic person, taking enjoyment in messing with her victims before finishing them off. She seems to have a somewhat caring relationship with her brother, Gyutaro, though she has been seen insulting and ridiculing him when they both fail, showing that despite her love for her brother, she isn't above ranting and lashing out at him, as shown how when she spoke cruelly of him upon their defeat, even insulting his appearance and viciously claiming that he couldn't possibly be her brother.
As a courtesan, she seems to have a seductive side as seen during her typical interactions with her male clientele. Despite being hundreds of years old, she has displayed childish tendencies such as throwing tantrums and crying hysterically when things don't go her way and lash out against anyone to vent her frustrations. During her usual interactions with her brother and fellow courtesans, Daki typically acted something akin to a spoiled, arrogant and bratty child.
These childish tendencies may be due to the fact that she was only a thirteen-year-old girl when she was first turned into a Demon. It was noted by Gyutaro that as a human she possessed an easily influenced, honest personality, causing her to easily take up the personality traits and words of those she trusts and admired to heart, as seen when she was easily influenced by Muzan. Her brother Gyutaro himself believes that the sole reason why she is like she is now was due to her being raised by him to be selfish and to only worry and care about herself due to taking to heart his words of "take before you're taken from", resulting in her current personality.
Due to her nearly dying from being burned alive in the past, Daki suffers from crippling pyrophobia, displayed when Nezuko Kamado's Blood Demon Art briefly reminded her of the experience, leaving her paralyzed from mental shock. Later, it was implied that Daki's lingering fear of fire was also impeding her regenerative powers after being burned by Nezuko(although this could also have been due to her Blood Demon Art's unique quality to harm only demons).
However underneath her malicious personality, spoiled attitude and selfishness, Ume is shown to possess a strong genuine love for her older brother, as seen during her time in Limbo, where despite Gyutaro attempting to sever ties with her and try to send her to heaven, Ume stubbornly refuses to abandon her brother, even if it meant going to hell together with him. Having tearfully reminded him that no matter what happened to them, they were at their strongest together and promised that no matter how many times she died and was reborn, she would always be his little sister.
Daki was born many years ago with the birth name of "Ume" in the Entertainment District's Rashomongasi (Lowest Caste) area, where only sick prostitutes, geishas and oirans who could no longer work in the brothels were sent and left to die. Her birth mother was a prostitute there, having given birth to her elder brother a few years before. Her biological father is never mentioned, but was likely one of her mother's customers. Her brother noted their mother to be severely mentally unstable (most likely due to the district's extremely harsh and poor living conditions), having attempted to kill herself and her son numerous times as well. She also physically abused him due to not having the finances to keep him fed, forcing him to fend for himself. When Ume was born, their mother hated her due to her hair color and eyes and would try and kill her. One day, their mother tried to cut Ume’s hair off with a razor, but Gyutaro became enraged and went on a rampage. This lead to their mother distancing herself from them. Ume was primarily raised by her elder brother until her early teen years, when her mother passed away from the disease Ume, the same sickness she was then named after.
Gyutaro noted that, even as a young child, Ume had an incredibly beautiful face that even grown men and women would falter from looking at. She was so beautiful that if she smiled, she would be given things; leading to the nickname Shiraume. This gave him hope that the both of them could rise from poverty and be able to lead a better life by being scouted and eventually recruited to work in one of the most prestigious Brothels of the district. And just as he had hoped, Ume, in her early teen years, was finally chosen to work in one of the Entertainment District's High Class Brothels. She began receiving proper education, taught the proper skills and fed the finest foods in her training to become a Oiran, and even before her training was even completed, Ume had already begun making a fortune by attracting many suitors and customers to the brothel, due to her beauty. At the same time, her elder brother began working as her "Collector" and would collect money and debts owed to the brothel.
However, this all came to an end when Ume, poked out the eye of a samurai, a customer of hers, when he insulted her brother while her brother was away collecting debts. In retaliation to this, she was tied, bound, burned alive and left to die in a ditch. She was then discovered by her brother, who began to hysterically panic upon seeing her near-death state. They were then discovered by the same samurai she blinded, accompanied by the Manager of the House she worked in. The pair attempted to kill both Ume and Gyutaro, only to be killed by her brother instead, who then picked up his sister’s charred body and carried her around town in search of help. His struggle turned out to be in vain, as he came to the realization that no one would help them.
As Gyutaro collapsed from exhaustion and fatigue from his severe wounds, Doma, who was Upper Rank Six at the time, happened upon the siblings while wandering the district in search of beautiful Geishas to devour. Taking pity on them, he offered to help the pair by turning them into Demons, claiming that it was because he was a "nice guy". He then challenged them to become strong enough to be chosen by Muzan Kibutsuji and join the Twelve Kizuki alongside himself.
Many years after becoming a Demon, Daki had already gained a reputation for her cruelty, such that senile elders remembered her ill-temper and demanded for "hime" (meaning "princess") to be added to her name. The activities of both her and her brother eventually caught the attention of Muzan Kibutsuji, who acknowledged their strength and power and officially allowed them to join the Twelve Kizuki and both were given the rank of Upper Rank Six.
Two days before Tanjiro Kamado and company infiltrated the Entertainment District, Daki was confronted by Omitsu, the manager of the Kyogoku House, over her mistreatment of the staff. When the hostess revealed her knowledge of Daki's past and extended lifespan, the Upper Rank seized her. Carrying her far above the district, Daki mocked Omitsu for her stupidity, labeled her as inedible, and dropped her to her death. Returning to her room, Daki was surprised to see Muzan Kibutsuji. Bowing to her master, she listened as he praised her for her new-found strength, cautioned her against getting careless, and stated his high hopes for her as a special Demon.
Walking with several assistants, Daki passed under Tengen Uzui's watchful gaze undetected in her oiran guise. Later, using her Demonic sash, she questioned Makio about the letters she had been sending. Sensing Inosuke Hashibira's presence, Daki's sash fled.
Daki appeared behind Zenitsu Agatsuma as Warabihime, demanding to know what he was doing in someone else's room, and quickly grew irritated at his lack of a response. She extended this irritation to two girls who tried to defend Zenitsu, insulting the young Demon Slayer before viciously abusing a crying girl for not cleaning a room fast enough. Her anger grew as Zenitsu grabbed her wrist to stop her cruelty.
Daki hit the youth through several walls, threatening him with further discipline, but stopped when the master of the brothel begged her to. Apologizing to him, she ordered Zenitsu's wounds to be treated and the mess from her fit of anger cleaned up. The Upper Rank then pondered over Zenitsu's identity, noting he might be a Demon Slayer. Later, in her room, she gloated over the success of her plan, promising to kill and eat all of her enemies.
Daki then appeared behind Koinatsu, seeking to eat her before she left to be married. She was then confronted by Tanjiro Kamado while restraining her fellow oiran and questioned him about the amount of backup he had, including when the Hashira would arrive. Dismissing the youth for his weakness, Daki soon grew enraged when he demanded she released Koinatsu and attacked the Demon Slayer with her sashes. Noting that he had survived, she complimented Tanjiro's eyes, wishing to eat them. She briefly clashed with the young Demon Slayer again, noting his skill in only severing the section of sash containing Koinatsu, but confidently proclaimed his doom regardless.
She then expressed irritation at her foes' interfering actions, asking Tanjiro about his backup again. Despite his refusal, she offered to let him live if he told her, noting that in their brief clash his sword had been chipped. She also stated that whoever had forged the blade was a terrible blacksmith, and quickly grew irritated once more when her opponent denied this, promising to kill him with her next attack. Launching said attack, Daki was shocked when Tanjiro cut through her sashes with a Hinokami Kagura technique. Noting the change in his sword style, she dodged his next attack, countering with an attack of her own. Missing due to another Hinokami Kagura technique, the Upper Rank turned to face her opponent just as his blade struck her neck.
Her decapitated head then fell to the ground, facing the head of Gyutaro. As their heads began to disintegrate, Daki screamed at her brother, blaming him for their defeat and claiming that "an unsightly thing like [him] could never be [her] sibling", while Gyutaro retaliated that Daki was weak and did nothing to help. Saddened by the siblings' bickering, Tanjiro then stepped in, covering Gyutaro's mouth to stop him from screaming abuse at his sister and pleading with them to try and get along, as they only had each other left in the world. Daki began to cry, wailing that she didn't want to die; however, her head finally disintegrated, leaving Gyutaro alone. As Gyutaro began to remember their life before becoming demons, Daki appeared to him in her original form as Ume, asking him where they were going and to take her along with him. He initially rejected her, sharply telling her not to follow him. However, Ume suddenly embraced him tightly, apologizing for her past words and crying out that they were siblings and she would never let him go. The pair then departed to the afterlife, with Gyutaro carrying Daki on his back as he had always done before.
Overall Abilities: Daki is noted to be a powerful Demon, having been personally acknowledged by Muzan himself as being a "special Demon". This is further given credence as she was able to overwhelm and hold the advantage over Tanjiro Kamado, Nezuko Kamado, Zenitsu Agatsuma and Inosuke Hashibira—all of whom were talented combatants, backing up her initial claims as being one of the Twelve Kizuki. However, her rank and position among the Upper Ranks is only thanks to her brother's powers and abilities that enhance her own.
Enhanced Strength: As a Demon who harbors an extremely high concentration of Muzan Kibutsuji's blood, Daki possesses incredible physical strength. This is shown when she punched a hole through a roof and could lift up an elderly woman with her bare hands.
Flesh Manipulation: Daki's main Blood Demon Art is to freely manipulate her flesh into various structures, mainly a cloth sash, which complements her beauty and looks. She can even morph and shift her flesh to have the properties of a cloth sash, as seen when she transformed her neck into a long sash of cloth to avoid being decapitated by Tanjiro.
Hair Manipulation: Daki also displayed the ability to manipulate her hair as a weapon, as she attempted to attack Inosuke with clumps of her hair after he successfully decapitated her and took her head from her body to prevent her from reattaching it.
Immense Speed and Reflexes: Daki is extremely fast, especially in terms of her attack speed, being capable of evading the senses of several Demon Slayers at once with her blinding attacks.
Immense Regeneration: Daki is shown to have powerful regenerative abilities, as seen when she was able to easily heal herself after being burned alive by Nezuko's Blood Demon Art, and was able to regrow her severed sash tentacles seconds after they were cut off. Daki was also shown to be able to easily reattach her severed head despite being repeatedly decapitated by Tengen and Inosuke.
Psychic Connection: Daki has the ability to share her senses and mind with her elder brother, and also allow him to control her body by implanting one of his eyes into her forehead. Through this eye, she can send him logistical information through this link in order for them to better coordinate their attacks. At the same time, this ability also enhances all of Daki's own existing abilities and enhances her own sense of sight, due to her being implanted with one of her brother's eyes. This is seen when she's able to easily keep up with Zenitsu while he's using his incredibly fast Thunder Breathing techniques.
- Decapitation Immunity: While her brother is "sleeping" inside of her or when his "core" is implanted inside of her body, Daki is completely immune to death by decapitation. This is showcased when, despite being repeatedly decapitated by Tengen and Inosuke, Daki's body showed absolutely no signs of disintegration. As the Demon Slayers quickly realize, the only way to bypass this immunity is if Gyutaro himself is simultaneously decapitated alongside her.
Unlimited Stamina and Endurance: Daki possesses absolute and infinite stamina and vitality, never tiring and always remaining in optimal physical and mental condition.
Sash Manipulation: Daki can manipulate the sashes she dons on because they are made using her flesh. When engaging in combat, she shapes her clothing into dozens of sashes as sharp as blades and as durable as shields, making it a perfect blend of offense and defense.
- Flesh Obi (
蚯 蚓 帯Mimizu Obi?): Daki has also displayed the ability to create sentient flesh detachments from her own body, as seen when she was able to create living Flesh Sashes to guard and protect her "store house" and watch over her "meat", and again when she created another living sash to monitor and watch over Hinatsuru as she suspected her of being a spy for the Demon Slayers.
- Telepathic Connection: Daki has also shown the ability to telepathically communicate and monitor things through her living sashes, as seen when she was able to easily observe Inosuke's battle against her Sash detachment and was later able to have a full on conversation with it to give it new orders on how to deal with him.
- Flesh Storing: Whenever Daki's finds a "beautiful" human that she wants to eat, she would usually "store" them inside her Flesh Sashes. Seemingly trapping them within the sashes and transforming them from 3 dimensional beings into 2 dimensional flat designs within her Obi Sashes, that also puts them into a deep sleep while they're trapped inside, allowing Daki to store a considerable amount of "food" in storage for later consumption. However a weakness to this is the fact that in order to free someone from the sashes one must simply cut it apart while making sure to avoid cutting the people trapped inside, immediately freeing anyone and returning them to their previous form.
Daki's attacks revolve around using her flesh tentacles that are shaped and retain the properties of sashes. Since her flesh is the source of her sashes, she can generate dozens of them to overwhelm the enemy while still properly defending herself.
- Daki's Demon alias contains the kanji for "degenerate, descent, lapse into" (堕 da?) and "princess" (姫 ki?), and her real name contains the kanji for "plum" (梅 ume?). The alias she used as an oiran translates to "bracken" (蕨 warabi?) "princess" (姫 hime?).
- It was revealed by her brother that her birth name as a human, "Ume", was the name of the disease that killed their mother. It appears that would be syphilis, as its Japanese name is "Baidoku" (梅毒); "Bai" and "Ume" are alternative readings of the same character.
- Daki's human nickname contains the kanji for “white” (白, shira) and “plum” (梅, ume).
- Muzan saw her as not a very smart child.
- It's possible that part of the reason Muzan pretended to like Daki was that she was beautiful and a major source of income. It's noted that Muzan's favorite Upper Moon was Gyokko, as his pots were works of art that could be sold for a high price, suggesting that despite being a demon Muzan still saw value in having cold hard cash. As an oiran, Daki would also have made a good deal of money.
- From the references and words of Muzan in Chapter 98, it is likely that her brother Gyutaro was the true holder of the Position of Upper Rank 6, not her.
- This is further reinforced by the fact that Tengen Uzui, the Sound Hashira, was able to easily cut her head off without her noticing and confirmed, from his own experience battling Demons, that she was nowhere near qualified to be one of the Upper Ranks without her brother's support.
- Daki's ability to transform her neck into an extendable sash appears to be based on the Japanese folklore yokai called the Rokurokubi.
- (To Tanjiro Kamado) "Blah, Blah, Blah... Don't you ever stop your prattling? I don't remember such things. The past is the past. I'm a demon now, that's all that matters. We don't get old. We don't need money to eat. We don't get sick... and we never die. We never lose anything! We never fade. We're eternally young and beautiful. And we're strong! Demons can do whatever we want!"
- (To Tanjiro Kamado) "You humans are so miserable. No matter how hard you try, this is all you got. How unfortunate.."
- (To Gyutaro) "No! No! No! You can't leave me! You mustn't leave me! We have to stay together! No matter how many times I might be reborn, I'll always be your little sister!"