Godlike:
Lugia (PKMN) vs. Johnny (SH3) - I haven't played Pokemon, and it doesn't matter. Pokemon are weak to spunky young 10-16 year old kids, and Johnny is a detective. He'd surely find a Pokeball and have a new pet here. I'm not sure he even needs his funky Awakener form (though if that's needed to soften Lugia up for a capture, sure).
Dart (LoD) vs. Guv (DQ8) - Guv is 1/4 Dragon or whatever, so yeah, tough times for him.
Lucia (Lunar2) vs. Dante (SMTN) - Oh god Lucia DIE. Lucia is weird since when I originally stuck her in Light (yes, that was me) it was with a big asterisk saying it wasn't Blue Spire /postgame Lucia. Does she still have said asterisk? Regardless, I'm going Dante here. The Demifiend & friends beat up gods and stuff, and Lucia still has the brains of a 6-year old by falling for Zophar's most blatant traps. Dante's got the intelligence edge here and can tank one shot of Lucia's magic at worst.
Aya Brea (Parasite Eve) vs. Ryu3 (BoF3) - Goooooo Aya, though it sounds like she's spoiled here.
Heavy:
Reis (FFT) vs. Argilla (DDS) - Reis is DRAGON, sure, but "Dragon who was having trouble with random Zodiac Stone thieves." Argilla apparently has trouble actually finishing people off, but generally higher respect for her regardless. A match fit for high Middle.
Hugo Hewitt (WA4) vs. Tear Grants (TotA) - Uh, Hugo isn't great in Godlike, but he is a ridiculous Heavy. In the cutscenes, remember, Raquel and Jude manage to keep up with him. Still, Tear never shows off any nuke-area abilities with her Seventh Fonist Artes, and that's what she needs. Luke would win this one.
Edgar Roni Figaro (FF6) vs. Cecelia Lyn Adelhyde (WA1) - Edgar in Heavy? Not really to me, he's basically Lucca level - good with machines, mild Esper hype. Cecilia is, unfortunately, a total Mary Sue - spirits love her, golems follow her, she's a chosen one, etc.
Middle:
Dryst (Brig) vs. Umaro (FF6) - Didn't play Brig, but know enough that Brig commanders recruit monsters. And in-game, Umaro is Mog's servant. So, uh, yeah, Dryst has a new pet.
Deneb (OB) vs. Juan (S3) - Juan's plot power is BE SLEEPY. He's comic relief fit for Light.
Elena (FF7) vs. Zelos (ToS) - Zelos is the Chosen of Tethe'alla. Elena gets captured by Don Corneo. Horrible slaughter. (Also, Excal, Zelos's occasional incompetence is mostly an act.) Yeah, Zelos is a High Heavy to me at least.
Seth (FE8) vs. Garet (GS) - Seth isn't bad, but yeah, Djinn (but no Tonic) hype.
Light:
Tia (Lufia2) vs. Roger Bacon (SHs) - BACON IN LIGHT. (Okay, yes, he does get kidnapped repeatedly, but he can also build spaceships and stuff.)
Leena (CC) vs. Margie Fatima (XG) - Hits with pan.
Alfred Schroedinger (WA3) vs. Lulu (S3) - Explode'd.
Poco (AtLC) vs. Lute (SaGa Frontier) - Uh, no vote due to not knowing Lute at all, but I will point out that while Poco might pale in comparison to Arc, theoretically all the king's soldiers got slaughtered by monsters. But Poco is a chosen one so he survives and can even do damage to the bad guys that everyone else thought invulnerable. No this doesn't make tons of sense, but theoretically he is a super badass, and it's just that the rest of your team is ridiculous super ultra badasses.