Can we swap that around? The Japanese style stuff formal and English stuff informal? Just a personal thought process with me but I've always seen kimono and hakama as more dignified. Also, glad you like the mixing.

Siblings would be fun. OH! We should totally have one of the sibs notice the prince likes the servant and try to woo the servant away before the servant catches on that the prince likes him :P That would be funny :P Hmmmmmm. . . . .*Grin* Let's go with concubine. I like the idea that maybe, the prince always planned on having a harem, since his father has one, and then just blowing up that whole future plan because he fell into legitimate love :P Let one of his siblings carry on the bloodline :P *Giggles* *Likes to fight the system a lot*

I can agree with that stuffs. Good ideas. 

Any idea you wanna add about the actual kingdom? I think it should be a large city, with plenty of nooks and crannies that can be used for fun plot stuff, but the surrounding area would be farm land, and the fishing village on the edge of the ocean a few miles away should be under the emperor's rule as well of course and could be used for some fun shenanigans :P