Why Kanao Tsuyuri is the best girl in Kimetsu no yaiba / Demon Slayer is because Kanao Tsuyuri has a short-looking appearance, beautiful hair, and a beautiful purple eye with her ever so kawaii purple knee-length pleated skirt in place of the usual hakama pants with her beautiful pink flower breathing Nichirin blade, Kanao Tsuyuri has a tragic past due to her parents are very abusive this causes our dear darling Kanao Tsuyuri to lose all of her feelings, she could not make her own decisions, this makes her so much more lovable, but then after Tanjiro Kamado from Kimetsu no Yaiba flipped her coin and gave Kanao Tsuyuri her chance to make any decision she wishes. This adds an entirely new aspect of beauty to Kanao Tsuyuri, but sadly after her sister, Shinobu Kocho died to Doma the demon with ice blood art, this enrages Kanao Tsuyuri as she almost died to Doma the demon due to her blade being stolen. After this, Kanao has been fighting with beauty and style, one of the greatest breathing and the most graceful. Kanao goes as far as sacrificing one of her eyes to use Flower Breathing, Final Form: Equinoctial Vermilion Eye. This shows that Kanao Tsuyuri is one of the best demon slayers out there, as her tragic past and her upcoming leading to her new personality, a human finally.