Brazil was a civ on Civ: Call to Power. If I remember right:
Leader: Getulio Vargas
UU: Dragoes da Indenpendencia (replaces cavalry)
UB: dont remember if this game had UB.
My suggestions:
UA: Not sure because the religion, maybe somekind of bonus in faith and happiness. Or plus food along rivers.
Leader: Dom Pedro I (declared the indenpendency of Brazil) or Getulio Vargas (governed two times, first was a dictator later as a president).
UU: Bandeirante - it was a scout on the colonial ages. Besides exploring, its importance was in bring indians to slavery and capture fugitives slaves. This unit would have a 25% chance to convert barbarians to workers.
UB: Footbal Stadium: replaces the stadium, with somekind of gold bonus.
Or
Comunity Churchs: +happiness and +faith. Replaces temple or somekind of similar new building the exp will bring.