GM and NPCs
I know henchmen and NPCs are a big part of RPG history, but I never used them to their fullest potential. As a GM, I never really felt like playing a dozen or more personalities at the table each night. After a while, all the NPC personalities blend into one...unless the GM is really good. I am not yet really good, so the NPCs remain minimal. One the one hand I feel my groups miss out. On the other hand I sure am glad I don't have to play so many characters each sitting.