Fighters who "bring it". Simple as that. Whatever the M.art (or no art, brawlers accepted), just go in there and fight. I can't care for point-fighting in mma or fighters trying to be safe. If you want to be safe then don't fight, go for a desk job and be careful with the paper (paper cuts can happen).
I gotta agree with your pick btw (you didn't see that one coming, did ya?). As a selfish fight fan I wanna see them fight as frequently as possible but as just a guy I hope they'll retire soon enough and, hopefully, with a decent life awaiting for them. They've already been in great wars.