When crafting the perfect female anime protagonist, manga artists and writers would often get inspiration from the aesthetic concept "Yamato nadeshiko." In pre-modern times, a Japanese woman labeled as Yamato nadeshiko was known to be beautiful and refined. The concept is so strong, that Japanese women strive to be Yamato nadeshiko in the public eye.
Source:https://www.cbr.com/yamato-nadeshiko-female-anime-protagonist-influence/