I sometimes find that playing the bad guy, or villains, or psychopaths tend to be much more psychologically rewarding. And you can really push it, you can push the limits, and get away with it. ↗
It really doesn't matter whether it's the villain or the hero. Sometimes the villain is the most colorful. But I prefer a part where you don't know what he is until the end. ↗
In any story, the villain is the catalyst. The hero's not a person who will bend the rules or show the cracks in his armor. He's one-dimensional intentionally, but the villain is the person who owns up to what he is and stands by it. ↗
When you are a hero you are always running to save someone, sweating, worried and guilty. When you are a villain you are just lurking in the shadows waiting for the hero to pass by. Then you pop them in the head and go home... piece of cake. ↗
If you find yourself always playing the villain, or if you find yourself being typecast into a corner where you're not happy then that's probably rather miserable, but if I have been typecast I am quite happy about it. ↗