Regarding the topic - it seems to me that the system of character desires, adding depth to the characters, is not so simple and affects many elements and mechanics of the game. In this regard, it claims to be a global change in the game
This Event Pack was not praised on release, and is now even worse in hindsight. Feuds are bizarre & tedious. Many Events are unreasonably corny or silly, and fire repeatedly during the same ruler's lifetime. Lastly, because Friends and Foes was...
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As strange as it may sound, but I think the game lacks the wish system from....the sims 2.
Positive sides - there are many and here are just a few of them
This would give reasons to carry out some events that you would never do without reason. For example, a brave character wanted to carry out a hunt to get adrenaline. A touchy sadist got angry at his son's bride and decided to arrange a bloody wedding for her. This wish system would tie activities and events to spontaneous wishes that you would never remember. This is a good challenge in choosing whether to put money aside for an event, follow the character's bad traits or endure them.
This would make the stress system more dynamic and dangerous. Not fulfilling these wishes you get negative events and stress, but somehow balancing the positive sides of your roleplays you can cope with the persistent desire to beat your vassal or arrange a bloody wedding. It would be a good part of the stress system rework.
It would eventually make more sense to make and interact with friends and lovers. For example, a lustful character wants a new lover more and his stress level increases every month from this. And this is a new layer of gameplay in a game about personalities and characters. Now, based on the character traits, desires appear, which also affect behavior and allow the game to give interesting stories for you. In the end, we all know that we are playing a "strategic sims for MEN"
This will make the personality system deeper and more interesting than just character trait squares.
The desire system can also interact with the game world as a whole - did you get a rival? Now there will definitely be a reason to conflict with him - because this will affect desires. Did they kill your father? There will be a desire to hold a funeral and take revenge on the killer if you are vengeful (or it will not arise if you have a holy all-forgiving character). A serious decision to create an empire - I want to throw a feast. And so on. There are a lot of interactions and combinations.
AI Characters will become more alive. But of course, balance is needed and a bunch of levers and switches that control how much they are driven by their desires