Since we need a larger number of origins/classes in TFT I came up with some.

To preemptively stat for the record, when I list out champion options that doesn't mean I'd be expecting them all to be added, and it certainly doesn't mean I'd be expecting gold buff to require all of them. There's also the matter of some champions getting to be 3 things (2 origins or 2 classes), but since most don't I've only applied 2 traits to people here.

Class: Summoner Options: Yorick, Azir, Illoi, Heimerdinger, Malzahar, Zyra Origins on these champions (in order): Isles/Undead, Desert/Shurima, Pirate, Yordle, Void, Wild

Buff levels: Either they are no buff to gold buff, bronze to gold, or bronze silver gold if all 6 are added. Effect: As you'd expect, they summon the same units they summon in regular LoL. Buff levels either increase number of units summoned or the tier of their single summoned units. In the case that all 6 champions are used, it would be the latter option to avoid overloading the board. The summoning would also count as their ability.

Notes: Buff aside, this could wither work as them just getting their summon at combat start as a passive ability, or be a cast spell using mana. I would vote for the former, since the board is only so big and I'd hate to see my people at full mana not casting because of a summon limit.

Orgin: The Deep Options: Nami, Nautilus, Fizz, Pyke. Classes on these champions (in order): Elementalist, Knight, I'm not sure for Fizz, Assassin

Buff levels: I only have 4 here so either bronze to gold or just gold. Effect: Best idea I though of is Fizz's shark executing people. There may very well be a better idea. Either buff level would determine health threshold, or set a number of times it could happen. Most likely, similar to how the gold only Phantom buff hurts 1 enemy and that is, Deep buff would probably be gold only and execute the first enemy under a health threshold, ending there. Would synergize with phantom either way.

Notes: Pyke, in terms of the character, is basically an anti-pirate, so he should be deep instead of pirate, not along with it. Technically Fizz is from coral reefs, which aren't really deep, but he's still an ocean person. If you have a better idea for Deep's buff please offer it. I would really like to see Deep be a thing but of course I don't want it to be under or over powered.

Origin: Shurima/Desert Options: Azir, Amumu, Cass, Nasus, Renekton, Skarner, Siver Classes: Summoner, unsure, Sorcerer, Brawler, Brawler, Guardian, Ranger/Blademaster

Buff levels: Bronze-silver-gold Effect: Knocks enemies up with a sandstorm effect. A cc effect so short it's basically just an interrupt.

Notes: Skarner's whole thing lore wise is protecting his race, who are all asleep. On that note I chose Guardian from his origin, because I wasn't sure what to make him otherwise. If somebody has a class idea based on his kit, that may be better.

Some other idea's I've thought less about:

Riven as another exile Ionia as an origin (Jhin, Irelia...) Some sort of "Time" class with Echo and Zillion where they get a revive when they'd die, to some given hp percentage. A "transformers" class with Kayne, Kha'Zix (probably instead of being assassin), Kai'Sa, and Victor where the buff adds effects. Alistair as a wild/knight