Any know if rns-e can display asian languages?

I can't recall anyone mentioning any languages other than the usual European ones.

Try creating an SD card with the song titles in the languges mention in the title field of the MP3 header, and see what appears on the RNS-E screen.

basically with chinese/japanese inputs, it is done in a coding (usually Big5) which needs to decoder to decode into the characters

i tried putting it in nav, all i get is question marks or random symbols

I think you've proved it's not possible then.

that would be neat if it can!