Help with first time creating a cube (Mostly Avatar)

Hi all, I'm looking to create a cube with my leftover cards not in my commander decks. I've opened and played a lot of Avatar in addition to being a huge fan of the franchise so I have opened a lot from the set, went to pre-releases, did pre-releases/draft at home with friends/fam, etc. I will use plenty of it to make a few commander decks though, Aang and Azula for sure plus possibly considering some from the other big characters (Iroh, Ozai, Zuko, Katara, Sokka, Toph)

I'm not sure I want to make just a set cube of that since I have a lot of other fun cards that can be good in the cube. I have a little from Spider-Man (3 of the dual faced mythics, can get the other 2 to make 5), a whole extra Sultai Arisen commander deck, bunch of old cards from scourge/onslaught (not that good lol), bunch from Foundations and Tarkir.

Need help on where I should start. Do I go fully singleton or do I include multiple copies of commons/uncommons (including non-avatar cards)? Will be drafting/playing sealed with usually 4-6 people but also rarely sometimes 8 people. Also, what other sets go really well with the Avatar set? I'm sure that the lessons from Strixhaven should fit.