I really enjoy RPing more so than the system, but I do enjoy some systems. I love Fate to death, but I do really enjoy D&D and Pathfinder. I'm fairly flexible on campaign settings and the like, though I do have my own preferences, of course.
I like helping build the setting or at least putting my input for one. I prefer to be an active roleplayer instead of a passive player.
Even if that means walking into a trap that I know is right in front of me.
I have a pretty strong preference for not murdering helpless people, and I get sort of uncomfortable with various torture and whatnot unless we're playing an explicitly evil campaign.