I highly recommend Planescape: Torment. It's an old PC rpg, same engine as the Baldur's Gate series. You can probably find it in a bargain bin. The box art is horrendous, but don't let that put you off. The game itself gives you a massive amount of freedom in the way you do just about anything. You can lie and cheat your way through situations, or use your charisma to convince people to do what you want, or you could be a good guy. No game I've ever played gave you so many options in behavior, especially in allowing you to be a less than pleasant person.
Besides, the game has a flying skull that hits on zombie women.