The romance story would be between two people of the SAME SEX.

And the romance would not be between the main characters/will not just be the main characters.

More deaths of main characters, the fans love that. Right?

A diverse job system that changes what you look like OR make it possible to SEE the armour your wearing, I mean gawwwd. Or do what 6 did and have a smurfload of characters.

Be able to make your main character? Okay maybe that'd
be hard to implement...

A character who is a Beastmaster like in FFXI, that'd be soooo cool and fun!!!

I'd reintroduce the old FF battle system OR have that system chooseable as well as a new fangled thingy.