Ok, from all the civs that have been revealed so far:
China: Empress dowager Xiaozhuang, complementing Emperor Qing
Rome: Emperor Augustus, complementing Trajan
India: Ashoka, complementing Ghandi
Russia: Catherine the Great, complementing Peter the Great
USA: Abraham Lincoln, complementing Teddy
Spain: Isabella, complementing Philiph II
Germany: Frederik the great, complementing Barbarossa
France: Louis XVI, complementing Catherine de Medicis
Japan: Emperor Meiji, complementing Tokimune
Aztecs: Nezahualcóyotl, complementing Moctezuma
Egypt: Queen Hasheput, complementing Cleopatra
Brazil: President Juscelino Kubitschek, complementing Pedro II
England: Elizabeth II, complementing Victoria