lol
what are starcraft heros like?
Jim Raynor?
For every unit in the original SC, there is a hero version of that unit available in the SC Campaign Editor. Most of these hero units were not actually used in the game's storyline, but are there just so people can mess around with them while still having regular units available in a game.
I expect they'll do the same for SC2, but with many more ways to edit each unit.