Rogue- I was accused of being a rogue soldier when I was in the Army. I would always leave the area with my M240B my squad leader told me to stay in, because the position sucked. I couldn't shoot at anything. In addition to that, I would always take off in my HMMWV, and flank the opposition with a few of my Squad Designated Marksmen buddies, and have our way with them.
Ronin- I've always been fascinated with Ronin. There's something about a badass Samurai, who doesn't have to answer to anyone.