Cherokee
This is a good unit!
Its improvements are good, but I will modify one slightly.
Current technologies:
Sequoyah’s Cherokee Syllabary: In addition to its current buff, it increases the population limit by 5, and increases the villager limit by 5. (For settler’s cart by 2)
New technologies:
Chiefdoms: More complex form of government than tribes or bands makes Cherokee soldiers cheaper. (10% cheaper). It also generates a bit of experience while you are allied.
Flint corn: Crops produce more food thanks to this kind of corn. (+ 10% food production)
I don’t see the need to add a new unit because I think it would be somewhat far-fetched. If anyone has an idea, they can tell me.