Thank you a lot for your answers
@Guandao and
@The Kingmaker !
@IgorS You asked earlier about Zimbabwe (or rather Mutapa, but I have broaden it to include Great Zimbabwe and the Rozwi empire). I have made my research, and there you go, for leaders, cities, and others.
Leader : Changamire Dombo -> warmonger and conqueror leader
Leader 2 : Nyatsimbe Mutota -> bonus on founding cities and expansion
UU : Rozvi Warrior -> Those warriors were the backbone of the Rozvi empire army, and were feared by the portuguese for their high discipline, effectiveness and obedience, which allowed them to defeat them more than once. They wore axes, bows, spears and assegais.
UI : Stone Tower -> Great Zimbabwe is very known for its stone structures, unique in the african continent. If the tradition was partly lost during the Mutapa reign, the rozwi maintained it and built many stone structures.
City list : Great Zimbabwe, Zvongombe, Dambarare, Manyika, Masapa, Khambi, Danangombe, Naletale, Massapa, Maramuca, Piringani, Luanze, Angwa, Makaha, Chitomborwizi, Shigodora, Matuka, Rimuka, Bokuto, Vumba, Tafuna, Harare, Tete, Chitungwiza, Mutare, Gweru (This city list is inspired from 1/ Mutapa and Rozwi empire cities ; 2/ the places where portuguese "feiras" were installed within the Mutapa empire ; 3/ Today's Zimbabwe great cities, but only Shona ones, since the Zimbabweans empires were exclusevely Shona).
UA : Something related to either trade or cattles. the Zimbabwean region extensevely traded gold and ivory through the Zambezi, especially to the portuguese. Cattles were of utmost importance in Zimbabwean societies, as there were very little land for farming. Even tributes to the king were paid in cattle (and that is common in the three great Zimbabwean empires).