Godlike
Jessica Albert (Dragon Quest VIII: Journey of the Cursed King) vs Thanatos (Secret of Mana): Neph's notes make it pretty clear that Thanatos resists (non-holy) elemental damage, so that should spoil Magic Burst, and let him win with sleep/petrify/freeze/whatever.
Terra Branford (Final Fantasy VI) vs Deamoned (Breath of Fire: Dragon Quarter): Ned doesn't OHKO Terra due to good def, and probably gets 2HKOed by Ultima? If not she's in some trouble, forget how Drain interacted with absolute defence (if it still worked then she wins easily, of course).
Heavy
Jowy Atreides (Suikoden II) vs Tidus (Final Fantasy X): Both are borderline Godlike, but Jowy lines up very well here. OHKO to Tidus' bad defence, fast/durable enough not to be blitzed before then.
Scias (Breath of Fire IV) vs Maya Schroedinger (Wild ARMs 3): Note for Pyro, Scias' limit doesn't kick in 100% of the time. Anyway this... is fairly close? Need to check a few things like (a) does Calamity Jane OHKO, (b) can Scias avoid Maya's limit while still 2HKOing [likely not], (c) who's faster [Scias?]. Good fight, will look up some numbers in a bit. EDIT: Okay, some answers. Maya does OHKO (Scias is 83% pdur, I definitely see Calamity Jane closer to 90%). Scias is faster. Scias can 2HKO, but... Shining Blade only does 69% to average. Maya's probably PCHP at worst to me... slightly higher even... and if she's even slightly higher than 69% can never dodge Maya's limit (below 2/3 of her max HP). Even if she's average/a bit below, Scias would need to find something which does a perfect amount of damage for his opener. It looks like his physical is too strong (he can't weaken his weapon since this also weakens Shiningblade), and his magic is too weak. Maaybe he could use two Blizzards + Shiningblade, but that lets Maya possibly just 2HKO him with normal damage? Probably not. It is his best argument, but he needs numbers to line up just perfectly. Meh.
Hect (Grandia III) vs Queen Zeal (Chrono Trigger): Strong kneejerk. Zeal is way faster, wins with Hallation/poke, and Hect can't fuck around trying to avoid doubleturns post-limit because Zeal... may just 2HKO her with Hexagon Mist to start with, and certainly 3HKOs. Actually, screw Hallation.
Middle
Palom (Final Fantasy IV) vs Nadia 'Marle' Guardia (Chrono Trigger): Status immune, good mdef to ward off Death (not that I respect Death any to start with), inflicts stop or whatever.
Elaine (Suikoden III) vs Stocke (Radiant Historia): Oh. Hmm. Elaine just avoids a 2HKO, and is faster. That seems to put some pressure on Stocke, but... even with fire (which is slow as hell), she only barely 3HKOs, and Stocke can stall that with his crappy healing. Her physical is a 5HKO here because Stocke pdur, so he can... slowly make headway against that by healing? Eh, probably not fast enough, since Elaine's physicals do stun rarely and she does doubleturn periodically. I... think Elaine pulls this out. Close though. Not sure if Switch would flip this fight (I'll let someone else wrap their head around that).
Anita (Suikoden II) vs Hippopressor (Mega Man X: Command Mission): Close which probably incidates Hippopressor's problems in the division since he does the spoiling here. Anyway, gets off Shark Missiles which he 2HKOs with just fine, and this does happen before Anita's fouth turn. Anita fails to 3HKO here, so yeah.
Tear Grants (Tales of the Abyss) vs Rouge (SaGa Frontier): This seems awfully familiar somehow. Turn 2 ID against Tear... can she stop it? Doesn't look like she can 2HKO first, not aware of any tricks she has here that'd work.
Light
Augst Henricksen (Wild ARMs 4) vs Rhys (Fire Emblem Series): Don't see Augst as nulling holy. You easily could, though! A good match involving Augst!
Fantastica (Wild ARMs XF) vs Ilyana (Fire Emblem Series): Even assuming good accuracy against Ilyana, Fantastica has a 4HKO that triggers counters while Ilyana has a 3HKO. Slow Down? What Slow Down? Also, Ilyana goes first.
Zhuzhen Liu (Shadow Hearts) vs Cyan Garamonde (Final Fantasy VI): Assuming Leo's Bear Zhuzhen handles anything Cyan does easily enough. Cyan miiight stall him with Empowerer though, if he doesn't get statused before then.