The "Reggie the Rocker Character Pack" DLC for Killing Floor has only one character and is really stupid; fortunately it's the good kind of stupid (and it's still not as stupid as the Chickenator so there's that too). Reggie is a mumbling Keith Richards-type former rock star with about a dozen voice lines. Total. Say what you will about the other voices in the game, but at least they have several different lines for different contextual actions. Most of Reggie's lines are unintelligible mumbling, and it's so dumb it's actually funny. His cigarette stays lit when he dies, too, which is a universal sign of badassery.
I'd only recommend this for KF1 aficionados, if it's on sale. I don't care if KF2's store skins cost even more, this one's still a tad overpriced.