On their own, the hero is too pure and noble and you want to punch him in the face just to make sure he can cuss, and the rogue ends up being too much about attempts at being clever and his not quite being on the moral up-and-up until you want to roll your eyes, but combine them and they're great.
In Star Wars terms, we know Luke and Leia will always do what's right and try to save the universe. OTOH, we don't know if Han will try to save the universe or if he'll just say screw it and go haul them out of the line of fire, or just decide they don't need him anymore(not that Han has enough faith in their ability to stay aline for 5 minutes without him)...all we know is that he'll be in it to haul their bacon out of the fire, even if they don't want him to.
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In Star Wars terms, we know Luke and Leia will always do what's right and try to save the universe. OTOH, we don't know if Han will try to save the universe or if he'll just say screw it and go haul them out of the line of fire, or just decide they don't need him anymore(not that Han has enough faith in their ability to stay aline for 5 minutes without him)...all we know is that he'll be in it to haul their bacon out of the fire, even if they don't want him to.