I often just ascribe my own personality (Well...Plus a few levels in badass) to the hero when playing an RPG. I tend to be a nice guy, often a mage, or a mage/fighter hybrid, and while I always try to help those in need, I WILL unleash righteous fury on total pricks, as well as take any underhanded advantages I can get against baddies.
I think I've only really roleplayed twice... I forget the first time. The second time is...well, now, actually. I'm trying to get into morrowind, and I'm playing my character as a laid back, naive Khajiit, who thinks that everything belongs to everyone, and who believes that "thieves" is another word for "friends" (he read it in a book made by the thief guild! IT HAS TO BE TRUE!!!!).
While skyrim interests me, I'm gonna wait for the inevitable GOTY version which will have ALL the content in it at once (so I don't have to wait for it), as well as all the patches, meaning less nasty bugs when I get to the game.