COSMOS SIDE
CG derplander in warrior garb is a possibility but it's probably Y'shtola as she's already our rep now in Theatrythym. They'll probably want to use a Miqo'te since Shantotto and Prishe already use Lalafell (Tarutaru) and Elezen (Elvaan) races. Plus she has the flashiest, visually cool looking moves out of the scions.

Felis already posted the two pics I was going to use from my site haha:
Quote Originally Posted by Felis View Post


Besides the multiplication and barrier, she can absorb/deflect bullets and weapons.

The other scions, particularly Thancred and Yda, have really stepped up their game in ARR with their own awesome fight scenes. It would be cool if they came out for special moves, like how the summons come out for Yuna's attacks in Dissidia. Maybe all of them came out to pray and the twelve does some massive aoe move for her EX Burst?

CHAOS SIDE
It purely depends on when the next Dissidia comes out. If it was during 1.0, it would've been Nael van Darnus. If it comes out relatively soon, it'll definitely be Gaius van Baelsar. Depending on how much time passes though, it may be Lahabrea as he slowly takes over the public face of "main" villain now that Gaius is gone.
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Hildibrand would make an excellent comedic npc that pops in and out of the story, maybe as a secret scene. To be honest, he'd make a horrible main character though.