When Chuck showed up and they started referring to him as the Lone Wolf, I was reminded of how badass this film was and decided to look it up. It hands down the best film to ever star Chuck Norris in a lead role. When it was over, I went back and watched the final fight a second time. It's probably not a "good" movie, but it was awesome and it left me feeling good after I watched it. And that's what counts.
What's weird is that in Expendables 2 they refer to him as Booker which was his name in "Good Guys Wear Black" but also as the "Lone Wolf" which references "Lone Wolf McQuade" so I guess I'm a little confused as to which character he's playing. I've never seen GGWB so I don't know if there's any similarity in his character there compared to Expendables 2. But with Expendables 2 there's the scene wear he kills all of those people by himself which he also does in the beginning of McQuade and in Expendables 2 and McQuade he says he "works alone."
Technically he's not playing any former character and all those references are just in homage to his past roles but if I had to pick one I'd say he was McQuade.