"Happytime Final - HTB (The Ruse of Kings)" is a Chinese mod based on the Medieval 2 Total War engine. In HTB, each playable faction (so don't cheat by playing as the Aztecs, Papal States, or the rebels) has its inherent characteristics, from the value of buildings to the transformation of the entire gameplay. No faction's gameplay is similar, and even within the same faction, the gameplay experience can be vastly different depending on the path chosen. There is no faction whose gameplay is absolutely single, as long as you study it carefully, you will always find new things. For example, in the Catholic religion, the Holy Roman Empire can have several electors competing for the throne, and each elector's characteristics are unique. You can also choose the Bohemian Hussite as the state religion, or establish your own school, and control the country with the emperor as the core, from troops to finance, everything is absolutely different.
