Godlike
Luis Virgil (XS) vs. Shania (SH3): My vague gut is that she can buff and smash through all of form 2's HP. First form can't really scare her at all. EDIT: Oh yeah, and XS1 lacks paralysis and SH3 lacks Stop? Wouldn't be a stretch to call those equivalent, and then this just gets kinda easy.
Luther Lansfeld (SO3) vs. Terra Branford (FF6): Ooh, this I'm not sure on.
Loki (VP1) vs. Genevieve (VP1): Hey, it's the same thing with a lot more HP! No, VP2 boss Res does not make up for this. Might close the fact that Loki has more damage, too!
Heavy
Arnaud G. Vasquez (WA4) vs. Maya Schroedinger (WA3): Actually, Maya has ITE even at full HP. It might even 2HKO Arnaud. It doesn't have to. Spoil'd by stat down resistance.
Rune Walsh (PS4) vs. Saki Inugami (SH2): OHKOs with Energy Charge. ;_;
Ultros (FF6) vs. Valter (FE8): If Valter survives that opening Tentacle, he wins! He... probably doesn't, though.
Middle
Nikea (S5) vs. Alonso (G3): Numbers are checked! Anyway, Nikea needs HP twinking to survive two Lancer Smashes. Problem is, with HP twinking, she... may fail to 2HKO. Depends how much taking away crits/swings hurts her damage. The drop is unknown! I'll say she pulls it off, since I'm inclined to disrespect early temps + at least her weapon is light and her Tech is high, suggesting a lot of it is innate.
Alef (SF1) vs. Hahn Mahlay (PS4): Well, um. Hahn needs both Elim to be turn 1, and to use the higher SF1 levels, or at least something in between, so that he can survive without going to a shield. Alternatively, he could instantly lap after using Slow Down. I... think he wins on average of my interpretations. Especially since I'm inclined to tiebreak for the person who, at the very worst, always always has at least a 60% chance of winning straight up with Vol.
Duran (SD3) vs. Fu So Ya (FF4): Same status or other.
Etna (Disgaea) vs. Brad Evans (WA2): Etna might have an argument, but definitely kneejerking this way.
Light
Balbaroy (SF1) vs. Gandar (VP1): Gandar is terrible.
Stallion (Suikos) vs. Big Joe (XG): So is Big Joe, even if he's awesome.
Edward Chris von Muir (FF4) vs. Raja (PS4): Edward is also absolutely pathetic.
Shiho (VP1) vs. Erk (FE7): As is Shiho. What is with this Light?