Alternis Dim (Bravely Default) vs Piastol (Skies of Arcadia)
I suspect the answer to this is the same as Alternis vs. Xorn, and the issue Elf brought up - can AI Alternis use Minus Strike on the same turn he hits 50% HP? Barely matters for the C4 fight, of course, since it's so hard to twink your offense to blow through his HP that fast, but comes up in Godlike against crazy damaging and fast bosses.
Heavy
Lulu (Final Fantasy X) vs Arnaud G. Vasquez (Wild ARMs 4)
While Lulu is pretty crappy in Godlike, she definitely belongs there IMO! Ah well, good for a sanity check, and Arnaud does make it interesting - if he could block Poison & Death without a 12 level hit, he stands a reasonable shot at setting things up, but might lose even through that.
Light
Rinoa Heartlilly (Final Fantasy VIII) vs Logg (Suikoden V)
S5 characters aren't that great at damage control with the crit rate & damage variance in the game, and Logg is undamaging by default. He COULD win if he gets lucky and does perfect chipping, and Rinoa could get unlucky on Limit fishing, but suspect this is hers.
H/G: Jessica, Ryu4, Lamington, Lambda, Lulu, Arnaud
Not so sure Jessica goes down - Sleep gives her at least some game vs. Lulu, but it's a duration check to see if Jess can build to a tension'd killing Twin Dragon Lash while Lulu takes a nap. Sleepward is out because then Lulu would just get Magic Bursted if she gives up Fire Eater. In the same way, unless Arnaud gets a lucky Magic Blocker, not sure what his strat is vs. Jessica. Ryu & Lambda are both pretty safe, although I guess I can see hyping up Arnaud as beating Lambda if you disrespect his accuracy?! Probably not.
M/H: Lon Qu, Margulis, Auron, Marle, White Mage (FF5), Pepperoni
Lon'qu annihilates everybody. Margulis... might actually resolve Acala Seal vs. Marle?? It just takes her forever even with Haste to smash through even 20% of Margulis's HP. White Mage might have the offense to beat Margulis, though, actually. Marle beats Auron & WM off status I would imagine. Auron is in trouble and probably loses to WM even through Zombie Strike, so WM up, Auron down? Granted, bad field for Auron.
L/M: Bowser, Ryudo, Cid, Liu, Rinoa, Logg
Liu should outslug everybody here, I think, super. Maybe Rinoa up if Bowser fails it up enough.