Yeah, sorry, I should've said. I've played quite a bit of the card game, Conquest. And he's a boss in that. Plus I read a short story about him that made him come to life for me. It's called Straken: A Hero's Death.
Basically, I see him like Batman: super-tough, but not "cheating" the way Superman (i.e. a Space Marine) does. Oh, and he has a healthy disrespect for authority, which should feel out-of-place in the fascist Imperium, but somehow works.