Game: Final Fantasy III (1990)
Certain fans credit the original title with creating the job system but for our money that honor rests with Final Fantasy III. Most of the standard professions started right here. Knights, thieves and dragoons are all present and accounted for. The game also originated the massive stat increases for the onion knight class once they achieved level 90. That's a lot of grinding, to be sure, but a crew of high level onion knights seriously cannot be stopped. Changing jobs in an RPG is just fun. If only it were so in real life.