I was thinkin a game where you choose to play as Tidus or Yuna, a seperate adventure from there points of view... I'm gonna say a really REALLY simplistic love-story type tragedy thing, basically, Tidus and Yuna have a little spat and are sorta mad at each other, then this big tradegy brings them togethor! (dont worry it gets more interesting)...

If you pick Yuna, the game starts in the dying Macalania woods, well practically dead woods. So everythings all black n stuff, n cool looking (like shards of charred crystal everywhere, see, where else is that possible?) Yuna's standing in the lake (which is quite dirty now, and the water's surface would look as though it has oil in it, kinda dirty yet retains the wierdness of macalania)... So she's being all "omg tidus blahblah" yeah, and if you start as Tidus, he'll be wondering through the zanarkand ruins having these wierd flashes of showing Yuna zanarkand... And then he's all "oh yuna omg blaahabaal" stuff.

Here would be the main plotline you uncover as the story progresses, the "spoiler" if you will. So, some guy or a thing, is in space, LIVING off of the deaths in Spira, pyreflies acting like the vessels to contain the death and the fiends existing solely to sustain the constant flow of death to him/her/it.... Which keeps him/her/it alive.

So now that Sin is gone, the flow of death is decreasing, and the thing in space is getting desperate. So... He makes mount gagazet erupt and guadosalam collapse (too faR? lol)... And turns the Ronso into these evil demon beastly things, and the guado into wierd freaky demon ninja things...

(This sounds realy farfetched I know... But yeah...)

So the game would begin with Tidus being attacked by ronso (who have 2 horns now, cos they're 'ard) and Yuna being ambushed by Guado.

Thats all I really thought of it... And yeah, it works in my head. The battle system would be likle a mix of X-2 and X. So it has the ATB system of X-2, yet no dresspheres, so as to make the characters more unique. Also, overdrives will be there, and aeons should somehow be reinvolved.