Passion

This variant rule has the DM keep track of the passion of the characters, enabling the DM to introduce quests of passion into the campaign. From these characters earn passion points which can then be used to modify rolls and to improve the likelihood of successful negotiations in certain contexts, for instance when seducing lovers, sweet-talking captors, or rallying troops.

Try passion out in your games, along with fame, infamy, fear, and other traits, and see how it livens up the experience, providing role-playing prompts and entry points when players feel somewhat distanced from their characters, or too wrapped up in the standard rules.