My dream preference is that the next tier of Omega follows the trend of highlighting an older Final Fantasy game, (Maybe VI? So we can get Kefka. Or possibly IV and get the four fiends etc)
THEN following that, a tier where Omega thinks, "Hmm, these specimens are really trashing these villains.... But what about Heros?" So we get a gauntlet of Protagonists or important supporting good guys from the old games.
Fighting Four Onion Knights (Or Luneth and his group), Firion or the Warrior of Light could both bring their party's along as well. I think there's a lot of potential for complex multi target fights similar to the Paragons of the Klaxxi fight back in MoP, (one of my favorites)
