Also potentially interested, based on plot/era. Not too fond of the Korra stuff, personally, but if you wanted you could look up the franchise's TTRPG stuff; they have a lot of good suggestions for campaigns in different eras of the setting.

I've always wanted to make an old, crotchety Earthbender kung-fu-master-archetype; the kind that's gotten old enough he can't do much of the flashy stuff anymore, but makes up for it with precision/ruthlessness. Like, another earthbender is getting ready to do their big stomp so they can throw a boulder at him---the old man kinda pokes his toe in the ground and a nail-shaped spike comes up right underneath where the opponent's foot is going to come down. Cue [url=https://www.youtube.com/watch?v=8r3IHDr7M2s]their reaction.[/url] But would a "been everywhere, done all that, killed a lot of people in my day" character be permissible in this RP, or do you think they'd come across as too OP?