Daki

Daki is one of the main antagonists in the Entertainment District Arc of Demon Slayer: Kimetsu no Yaiba.

She is an Upper Rank Six demon who shares that position with her older brother Gyutaro. Daki appears as a strikingly beautiful young woman with long black hair that fades into lime-green tips, adorned with numerous large, ornate hairpins and accessories. She works (and essentially rules) as a high-ranking oiran in the Yoshiwara Entertainment District, using her beauty, charisma, and demonic powers to manipulate and prey on humans.

Her Blood Demon Art revolves around razor-sharp obi sashes that she can control freely — extending them, slashing with them, storing objects (or even herself) inside them, and using them both offensively and defensively. She is extremely vain, prideful, and cruel, with a personality that swings between elegant sophistication and explosive, childish rage when insulted or challenged.

Her true strength only becomes apparent when her brother Gyutaro emerges from her body, revealing that the "Upper Rank Six" title actually belongs to the sibling pair working together.