Star Wars (Duh) - Master/Apprentice, Bounty Hunter/Employer, etc. etc. I'm always up to that, no matter what.
Warcraft/Diablo - An original story, but not necessarily with OCs.
Steampunk (Post-apocalyptic) - In which I'd play an inventor/engineer/scavenger.
Generic post-apocalyptic story - I'd probably end up playing a raider, or some other sort of criminal.
Parody - Making a parody of something, or a twist of it. Say, Portal but with a human(oid) Glados, or some fancy show or movie, like Monster's Inc, Avatar, or some game or movie cross-over. This is pretty broad, and same as with any of the other alternatives, will require at least brief discussion.
Fantasy - The traditional fantasy adventure, though probably not as isolated world-wise as previous has been. Being part of a court, working at a tavern, or something else that will bring more to the role-play than chatting between two or three characters, and the occasional incident. Less drama, more action.