Kocho Shinobu [Demon Slayer: Kimetsu no Yaiba] (Patreon)

There's quite a number of beautiful and attractive female cast in Kimetsu no Yaiba but none quite as charming and attractive as Kocho Shinobu who is voiced by Saori Hayami who can pull off a unique flirty but smug/snarky tone to her voice acting.

To list a few of the characters she voiced...

Hiiragi Shinoa from Seraph of the End,
Ushiwakamaru from FGO,
Kamisato Ayaka from Genshin Impact,

and the list goes on.

I think what really sets her apart from the other cast was her interesting backstory and the conviction she held. Other characters all had their own circumstances and interesting stories to tell but I feel like she had the most character development throughout the series despite being a supporting role.