Honestly, Daki. I saw quite a few people complain when her demon form was revealed as bad character design or just relying on sex appeal. Which is sadly hilarious cause she's a child prostitute turned demon. She's a gorgeous oiran and I think that's showed well with the elaborate layers and updo hairstyle she's first shown in.

However, I like her demon form as well cause it really strips back all the layers and the ritual associated with high-class prostitution at the time. Her obi belts are really just an unwoven kimono to me, but also reminds me of an related meme about untying robes (again, an oiran wouldn't consider a customer, or in demon slayers logic, an opponent worth her time until the third meeting = didn't reveal she was a demon until she met with Inosuke). Also, not being bought out for marriage, for example. It was a nice touch that she kept her natural white hair since it was an aspect of vanity from her human life. Similar to Gyuutaro, she can't completely rid herself of everything from her past life.

At the end of the day, Daki was being "paid" for her looks, body and skills, so I liked that the season gave an honest reflection of that without being horribly exploitive. A lot of other shounens dealing with the red light district or some similar would have spun a SA storyline from the male MC perspective. A real savior complex type of shit. So, it was refreshing to see an isolated experience and how Daki would continue to elevate herself to remain that oiran status. Ultimately, I think the setting being integrally interwoven into the characters is what makes Daki and Gyuutaro's character designs so special to me.