Team Fight Tactics Expansion Packs

This is basically a lot like what it sounds like, different set of champions to use in the game mode. While it might initially sound nice to just have every champion possibly available right away, it's already a nightmare trying to max out a team with one trait and any more would just exacerbate that.

Instead, you could have an expansion set that included champions from Zaun and Piltover, and give them an origin trait of their own; or you could have someone like Viktor be a Robot/Sorcerer, or give Singed a passive trait that leaves a poison trail as he moves around the board. There's a distinct lack of Shuriman champions as well, including Azir, who could be a Noble/Sorcerer, or Adad, who could be a Shuriman/Elementalist.

There's not just regions that are missing, but several other beloved champions: you could incorporate Teemo as a Yordle/Assassin that can toss his mushrooms around the map, Kai'Sa as a Void/Gunslinger who fires missiles at several targets, Yorick as a Phantom/Guardian that passively raises up a Ghoul when he takes out a unit, etc. You get the idea. There are so many more champions who could fill interesting gaps in teams that aren't out yet, and who deserve to not be lumped into a gigantic pile where they'll never be found in TFT.