The phrase "strong fighter" refers to someone who is powerful and skilled in combat or any kind of conflict. They are not easily beaten and have the ability to defend themselves or achieve their goals. Full definition
The obvious, massive difference between Hercule and the next strongest fighter on this game's cast (canon-wise) would perhaps relegate Hercule to this type of gimmicky role, but there's no reason to think that Hercule fans would have any problem with a realistic depiction of the world's reigning martial arts champion. (twinfinite.net)
The King of Iron Fist Tournament — a legendary martial arts contest that pits the world's strongest fighters against each other in the quest for fortune and glory — has been home to many such battles. (tekkengamer.com)
In fact, Pyrenees were such strong fighters that they may have even been used as dogs of war. (dogs.lovetoknow.com)