Hi there! I am from Southern Africa and there are actually lots of very interesting cultures that have featured in our region that I think could be great additions to the game. There are the Zulu, Xhosa, Sotho and lots of other African tribes that have very interesting history and conflicts - especially the Mfecane . You also have the  'Boers', who faced the British and African Tribes in various battles across South Africa. I know that these are pretty obscure cultures but nonetheless I feel that they could add some diversity to the game.