Godlike
Brahman (Digital Devil Saga)vs. Guv, Yangus, Jessica, Angelo (Dragon Quest VIII): Three Eternal Zeroes, yeah. Whichever team he catches out after one is dead. And there are only two monster teams...
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Lady (Shadow Hearts: FTNW) vs. Zophar (Lunar: Eternal Blue Complete): Zophar really likes this unscaled nonsense. He still OHKOs! While Lady's mean D-combo + final attack, which has an argument to kill him normally, is just a light scratch.
Heavy
Ulrika, Chloe, Pepperoni, Goto, Enna (Mana Khemia 2) vs. Indalecio (Star Ocean 2)
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Yosuke, Chie, Yukiko, Teddie (Persona 4) vs. Sephiroth (Final Fantasy 7)
Ryu, Rei, Momo (Breath of Fire III) vs. Divine Weapon (Wild Arms 4)
Middle
Xorn (Grandia III) vs. Ramza, Agrias, Mustadio, Orlandu, Meliadoul (Final Fantasy Tactics): Ramza can Yell everyone up to 50, not just himself, which tilts this. Xorn's only hope is to blitz out Ramza quickly with Dark Hymn. He has 24 FFT speed, so will triple 11 speed healers eventually... which just means Ramza starts by yelling them. Yeah, FFT has this. It was closer when I only remembered Scream and not Yell. It helps that two of the ice knights can use Lightning Stab to ignore shields while not applying any actually negative status (yes, you can still yell and scream while silenced!).
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Hugo, Fubar, Sgt. Joe, Lilly (Suikoden III) vs. Lyn, Eliwood, Hector, Athos, Serra, Nils (Fire Emblem): Sleep is seriously bad news. On the other hand, it's not turn one on Lyn and doesn't hit Athos ever. Hmm. Well, as long as Athos dies turn 1, it's not a problem, and Hugo + Lilly can manage that, I think. Hugo probably dies, but Joe can pick up the pieces from there, and the team does need a fair bit of luck with getting through evade.
Kefka (Final Fantasy 6) vs. Lavos (Chrono Trigger)
Light
Luke, Guy, Tear, Jade (Tales of the Abyss) vs. Pikachu, Charizard, Blastoise, Venusaur, Snorlax, Espeon (Pokemon): Surely. Pikachu is throwing up a Light Screen before he dies to make Jade non-good, Espeon + Charizard together 2HKO someone before they do much of anything (probably Tear?). GROWL is awful news for the fighters of all things, since it's MT.
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Daos (Lufia 2) vs. Ashley, Brad, Lilka (Wild Arms 2): Lilka needs to use Quick then really stay on top of the healing. Still, imagine she'll do okay... Brad probably isn't even 2HKOed so she only needs to Mystic every other turn. If Daos goes for status he's inviting a hell of a lot of damage.
Loki (Valkyrie Profile) vs. Crono, Marle, Lucca (Chrono Trigger): Another team with crummy MT healing, so Loki may be able to capitalise there? Thinking Carnage Anthem 2HKOs the non-Luccas. Marle can haste-heal to save one (herself), then revive Crono and heal herself, repeat... until she doesn't double. Other problem is CT can't do the needed damage with the MP it has unless it resorts to more MP-efficient moves than Luminaire/Flare, which... I'm not sure anything is efficient enough, especially since Life 2 is raping Marle's resources. Good fight, going with Loki though.
Squall, Irvine, Quistis (w/ Elemental Attack junction) (Final Fantasy VIII) vs. Serph, PC Heat, Gale (Digital Devil Saga): Well, hmm. Squall and Irvine go before average. Irvine can't one-round, but uses lighting to come close, Squall finishes on a press turn after attacking Heat (he's ice). Quistis beats on Serph some. Heat does something dangerous, but his status isn't turn 1. The entire team beats on him some more. He probably doesn't get a second turn, between 1.5 Squall hits + the others helping. Serph may kill someone by now, and is facing someone stuck with an ice physical (he nulls!). They should be able to outslug him, though it's not a sure thing.