While myth is blogging about Mass Effect, I feel compelled to post my Commander Shepard. She was the definitive main character for me, in ME1 and ME2 as an import.
I have the same dilemma about replaying the game. I want to take a new character in ME1 all the way through the good ending in ME2, which would also be a male renegade. I've tried to do this in both KOTOR games (male darkside), but I never get very far.
Anyway I'm still in the unrelenting grasp of Civ 5, so I suppose it's not a matter of immediate concern :P