Regeneration is a good one, as is someone that is generally hardier than the average fighter.  Someone that can avoid bullets, be it by shielding or controlling metal or being super fast or phasing out.  Mind control -- maybe an illusionist? 

Zombie Oscar?

Belasy: *shoots him in the head*  Right, well, he was a coward, and then he was an idiot, and now he's dead.  Problem solved.  T.T