I always got the impression that he was a BIG guy that could make anyone cower with just a look, idk it's how I have viewed him.
Well it looks like I was right (judging from the trailer), I knew just what kind of character they're going for. I doubt he's a good guy, but I bet a lot of people are going to sympathize with him anyway.
Edit
This is my stab at a good "defining song", based on rampant wild speculation. http://www.youtube.com/watch?v=BvsX03LOMhI
Edit
Hmm... may be more relevant to the burned man than anything. Also not a literal interpretation.