Depends on how close you want to clone real-world Asian cultures, and how much you want to mix in other elements.
Anything more specifically you wanted to consider?
I'm guessing you don't just want to put some ninjas in a bamboo forest and call it a day.
My thought isn't necessarily having too many perspectives, but splitting the action too much.
Like, is each of these characters having their own different sub-plot? That's where it gets too complicated. But if you have one event happening, but shift the POV to many different characters...
Hiya! Let me extend the hand of friendship to you!
I'll be the first to gladly offer you anything I can in terms of... whatever you might like.
Feel free to PM me here or add me on skype (found on my profile).
^_^
Depends on what you define as "mainstream". Books in general are less mainstream than television and film.
I think medieval style fantasy is less mainstream than Harry Potter/Twilight modern fantasy because it's closer to their own experiences.
I work at a movie theatre where we don't have 3D at all.
The fad kind of irritates me because now we have people that come in and complain as if the movie is TOTALLY RUINED because it is 2D. I literally heard someone ask, "What's the point?"
Because movies until now were just pointless all along.