SAThe known Leaders in Civilization VI. Each Leader will have a fixed agenda as well as a "hidden" Agenda. As you trade, you can get gossip information, and from interaction gain more knowledge about other Leaders through espionage. For example,
Teddy hates other Leaders who start Wars, but loves pacifists.
Egypt (Cleopatra) or Norway(Harald) loves Leaders who are more aggressive or have a strong military or navy
Civilizations can have more than one leader(Greece). These leaders have access to the same units and buildings/wonders/districts, but they have different agendas and bonuses, which allows for different playstyles.