The die that you break out for really important rolls because it always brings you luck.
I also tend to default to do-gooder when I RP. I only ever rollplayed a straight up chaoctic evil character once and it was FUN. So much fun I got booted from the group I gamed with because they couldn't seperate the character from me. Has anyone else ever had that problem? (Roll playing life/fantasy differentiation problems that is.)