Has there been a fanon idea for a possible Second Great War yet, besides (I think) The Final Avatar?
That's what my back-up idea was. Set somewhere between 600 and 800 years after the events of ATLA, a new Fire Lord has decided that he wants all the world for himself, much like Sozin did in Roku's time. However, thanks to likely advancements in technology by this time, he is able to attempt genocides faster and more efficent. The Avatar has to find a way to escape the genocides and stop the Fire Lord before Great War II ends in a Fire Nation victory.
I haven't decided on which nation the Avatar will hail from quite yet. It depends on timimg. Nor what his (Yes, I'm going with a male Avatar) team will be like. But I hope I can make this work.
Comments? Questions? Suggestions?