Please, Correct me if I'm wrong but Ive noticed each princess has a diff culture: - Rabbi...

then the dragon clan is japanese, isn't it?

No way they are, first of all this is a quasi-ancient China setting it would make no sense for the cultural center to be Japanese? Also one look at Meiyu should make it glaringly obvious what she’s wearing is hanfu (my best guess is ~Northern&Southern period). There’s so many distinct styles of hanfu & im pretty sure I recognized a couple just the banquet chapter so the better question to ask is what clan is which Chinese dynasty