Personality Traits in Crusader Kings 3 are the most defining Traits for characters, as they not only provide stats and other bonuses or negatives, but they also help determine the decisions players make, as to go against one's nature will incur Stress. In fact, when players are properly role-playing in CK3, it is these Personality Traits that make each reign unique, and players will also notice that the AI acts in accordance with their personality.