I actually tried to make a FFX prequel with rpg maker 2.

It followed the story of Yu Yevon and exactly how or why he wanted to try to summon sin. There was also a badly done sub-story about Auron trying to help Tidus (sort of Ben Kenobi/Luke Skywalker), as well as Auron trying to stop Yu Yevon. I stopped 'cause it didn't seem to be working the way I wanted. The Auron sub-story seemed a little off (especially as I couldn't have him doing much more than losing to Yu Yevon and saying mysterious warning type things), and the bad guy wasn't working right (this was before the release of X-2 and my BG was cyborgs trying to assimilate people -- I r original).

But a tragic story would probably be a new direction. I hope they do a story like that. but better.