Sanford Greene - Greenestreet on DeviantArt - helps me overcome my own recent lack of interest in all things manga/anime. Honestly, much of the work I see in that style strikes me as formulaic, but I think with the best of the artists that work in that style, craft overcomes style. I like Greene's craft - dynamic, bright and fun. Enjoy!
As a side note - I adore Avatar. It would make such an excellent rpg setting!