It honestly depends on the type of rpg for me. For instance, with a game with as much character involvement as saaaay Mass Effect or SW: Knights of the Old Republic, I feel the need to try and make a character as close to myself personality and physical-wise in order to empathize a little better in the story. On other occasions, such as with games like Sword of Mana(GBA) and the like where the script is already done, I just go with the flow. Doesn't hurt to play both though, right?