The Four Nations lived in Harmony? BS. Did you see now much land the Earth Kingdom had compared to the other nations. While the "Waterbenders" where at the poles, and scattered around in swamps. The Air Nomads were at their temples. And the Fire nation was on an island.
So I've been working on a little project. (Working Tittle) One Piece EXE. Adventure on Cyber Island. a cross between One Piece and Megaman Battle Network. in the Megaman BN 6 engine. In August hope to be able to share some details.