Perhaps they could try to get some real characters with personalities beyond:
"HI! I'M THE PEPPY GUY WHO FIGHTS FOR JUSTICE!"
"HI! I'm the bumbling but lovable idiot"
"I'm the angsty loser who hates everyone. I hope you die"
"OMGEES I'm, like, the ditzy tard chick that isn't worth a damn as a character but will have gratuitous amounts of porn written about me within a week of release!"
"..." (the silent type)
"RAAAAAAAAAAAAAAAAAAAGE"
Every character I can think of from the series is one of these or some combination there of. It kinda sad in my mind that the story telling of the series is lauded as being great.
Now don't get me wrong, I thought FFX was ok, and I really liked FFXIII, but it definitely was not because of the characters. Snow, Lightning, Hope, and Vanille were completely stereotypical for their designated roles (see above), it was actually kind of painful to watch through the first half of the game. Fang was something of a wild card as I wasn't expecting a character with a level of maturity and reserve, unfortunately it made her rather bland as I can't actually name any remarkable scene with her in it. Sahz was bumbling, but lovable, and the only character I actually liked through out the game (woot, father figure that isn't retarded in a video game).
In all honesty, Square should take some ques from the Tales studio for good characters. Every character from Vesperia was friggin awesome (minus estelle). Jade and Guy from abyss were great and there are plenty more.
Edit: For the folks who think that basing FF off of it off-shoot Kingdom Hearts. No. The battle system does its own thing very well, but don't start bringing it into Final Fantasy. Also, for the love of god and all that is holy, never ever suggest that they take story telling ques from that series. I dare anyone here to try and wade through the KH wiki and try to come out with any sense of what the hell the series is about.