Im happy to see my country making an appearance, my thoughts on the uniques would be:
UA - "Jeitinho"
All buildings that produce
happiness,
culture or
faith, produce one more of that resource(so a monument would produce 3 culture and a shrine would produce 2 faith and so on...). The cost of buying anything in cities with gold or constructing wonders is increased by 20% (or 15%?). Penalties are lost upon discovering Education.
UU - ??? maybe cangaceiro ( replaces rifleman )
Rifleman that heals completely upon pillaging and stats with drill I.
UI - Engenhos ( an impoved plantation ( or plantation/farm? ))
An Engenho can only be built on a tile that can be improved with a plantation (maybe farm too) that grants +1 food, +1 production, +2gold and is unlocked upon discovering Economics.
That way i think it will be a fun and different flavor civ than those that exists already, the "jeitinho" is a double edge, and the major factor BraSilians are loved/hated in real life. The penalties are true too and here everything take/cost a lot more to be done compared to other countries due to very bad and corrupt politicians and the dumb people that put them in power.
The sad part is that in real life we haven't reached "Education" yet to eliminate the penalties... . This is my guess, it would be fun.