I bring good news. I'm sure when you heard that there would be a game where Final Fantasy protagonists and antagonists could battle you were sure happy.
Thus was the birth of Dissidia
Because of your support there is now a sequel (in my opinion, remix) of it called
DISSIDIA 012 (Dissidia Duodecim Final Fantasy)
CONFIRMED CHARACTERS are
Kain Highwind (Final Fantasy IV)
Tifa Lockhart (Final Fantasy VII)
Lightning (Final Fantasy XIII)