I imagine some kind of mixture between Ash and Johnny Cage from Mortal combat, an ex-action B-movie star and martial artist, who got just too many comments on how he is a mediocre actor and quite a bad fighter and wimp in reality, so he got fed up and set out to prove his badassness as a mercenary. Of course, since he IS an actor, he sometimes gets carried away in action by aspects of his various movie personae, which then surface in the form of cheesy one liners, expressed at more or less fitting occasions. Also i think he should be a psycho and shotgun expert.