Sweet F.A.
You know what would be cool for the young adult Gaang movie when (and if) we get it? If they brought back all the original voice actors to reprise their roles.
Jack DeSena, Mae Whitman, Dante Basco, and Grey DeLisle (Sokka, Katara, Zuko, and Azula) are all still prominent voice actors in other stuff, and I imagine Michaela Jill Murphy (Toph) would be easy to convince since she’s been interacting heavily with the fandom since it came to Netflix a few years back.
The only question is whether Zach Tyler Eisen would be willing to return as Aang, since he retired from voice acting shortly after the show ended.