Xain: JRPG, as a genre, refers to a certain style of game. It doesn't refer, for example, to the fact that mostly Japanese people worked on the game, or that the game was programmed on computers running somewhere in Japan. Because of this, anyone in the world could set out to make a JRPG, as long as they follow the conventions of the genre accurately enough. Of course, the style does come from Japan and Japanese culture, so the vast majority of JRPGs will naturally be made by teams of japanese developers.
That's my best shot at describing it.







