I have an idea for a futuristic diplomacy/espionage game, where you play as a woman. You complete different objectives in multiple different ways, whether by stealthily killing and stealing information, by hacking, by dialogue routes, by seduction, or by stealing by pacificistic means.
This game involves you choosing from different races (human, half-human, alien), and each one has different pros and cons. For example, a human may be very good at seducing and dealing with humans, but mistrusted by aliens, so that she has to find different ways to deal with objectives involving different races. A half-human may find herself mistrusted by most races, but find her exotic origin, and greater knowledge of different cultures a great tool in seduction and stealing.
The game would be extremely open regarding means towards the ends, and the fun would be in figuring out what is the best way of completing objectives, given the aforementioned pros and cons of races, and the player's choices in dealing skill points.
One day, I may make this game. Until then, it remains only an idea...