Can we get Martial Arts?
I would like to see it complete with a combat trial. A rivalry like Cobra Kai. Have tournaments. The ability to be the bodyguard to a famous person in or do BETTER action movie scenes. Open a karate, Kung Fu, Boxing, school. Basically various styles. Give private lessons. Learn secret techniques that can do various things to other Sims. Like a palm strike to the chest that could make a drop after a certain amount of walked steps like in Kill Bill. Perhaps achieve a level of enlightenment that makes a sim do activities faster by leveling a skill up to 20 (YES, TWENTY). Let the sim choose a path of darkness, light, or nothingness.
Maybe they can host tournaments for local Sims, and even secret fight clubs to increase fame in the circuit to get a sponsor that will pay for a the training. And make the training somewhat expensive so there's something to aspire to for getting rich or help from someone rich. (I hate being able to rush through content because it's so small, or things are so cheap). Make it worthwhile. We'll be able to make money giving demonstrations like one-finger push-ups, Levitation for the Grand Master. Develop a reputation that instills fear in other Sims depending on the relationship. Sim becomes more confident and can be a bully or less prone to anger, while also making more effective threats.
Make a living from Sims placing simoleons on you to either win or lose pit fights.