Zuko's Mom has to be one of the stories right?
there are so many stories id want i dont even know where to begin
zukos mom for sure, but also avatar kyoshi, more avatar wan, azula after her imprisonment (could be tied into their mom story), team avatar adventures in between ATLA and korra, korra 20 years later when shes a fully realized and insanely powerful avatar, aangs death, the fire nation hunting down all the airbenders, Iroh as a young man, more about the giant turtles and the mythos of how the world of avatar came to be, etc
there is so much to explore there. i know they went into some of that stuff in the comics, but i never read those and dont intend to. as long as whatever they do is on the same level as ATLA and korra, ill be happy. fully expecting some woke SJW pandering but as long as its not overly done it wont be an issue for me.