A time ago we were debating about the inclusion of a Guarani civ in a future game, today I came to advocate in name of their less know neighbors, the Jê people, which Jê here being a umbrella term for a big number of culturally related tribes who inhabited today Brazil and didn't speak Tupi derivate languages. We have few records outside the traditional conflicts with European colonizers and forced conversion by the Jesuits, but there's some interesting stuff, like those cool underground huts used by some sedentary farmer tribes, who could serve as a unique improvement.
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Or that some Jê tribes were cannibals and consumed war captives and they own regularly, it wasn't exclusively a religious practice like the Tupi but I think a cannibalism ability, with defeated units giving food, for example, could still be offensive. The southern Jê(Kaigang) were the first to harvest the araucaria nuts and had most of their economy centered around it, could serve as a base for an ability who grant a unique bonus resource or boost unimproved resources in some way.
The major problem is the lack of a leader, even a mythological one like Kupe or Dido is hard to find. Anyway, nowhere the top priority civilization for a base game, but would be a cool dark horse to see in some expansion, like how Mapuche was in Rise and Fall, if they keep the south america non Inca native slot.