Lavos (CT) vs Purim (SoM) - Ask Cecilia how well it went for her.
Naoto Shirogane (Pers4) vs Claude Kenni (SO2) - lol id immunity.
Jessica Albert (DQ8) vs Shania (SH3) - lol ohko. It's like Jessica decided she was Sanger or something.
Zog (BoF1) vs Profound Darkness (PS4) - Superior slugger and hits Zog's magic weakness.
Heavy:
Yulie Ahtreide (WA4) vs Mazus (S2) - The way I take SDs, Mazus is faster by 0.5% than Yulie, and he still manages to comfortably OHKO her through the mdef. Any harsher scaling on the SDs would have him as faster by a wider margin - heck, even taking his speed literally would. So yeah.
Lenus (LoD) vs Popoi (SoM) - Gets hit with a spell, lol lenuses.
Eileen (S1) vs 2-Red (SaGa) - No swords for Red to me, and Eileen should 3HKO him without a hitch after transforming. Before, I'm pretty sure she 2HKOs... and she can last like eighteen turns. Yeah no, that's pretty trivial.
Middle:
Swampert (PKMN) vs Isabel (S5) - Okay, assuming Isabel goes with 40% Earth+Water resistance... she, as Monkey noted, is faster and 3HKOs on average. Swampert, after resistance, with two HPs (one under Torrent), deals... 118 RSE damage to average -before- factoring in accuracy/crits. That's 77% PC HP. Isabel's MDef is sorta cruddy, but the HP is okay enough that she may eke out mdur that's not that bad (should be above 0.8x, hopefully). With 40% Earth Res, assuming average defense, before crits and accuracy, an Earthquake deals... 48.6 damage to average defense. That's below average damage by a fair margin. Even with an Earthquake+HP, Swampy can't quite 2HKO an average durability PC with that level of elemental defenses, and I don't think Isabel is far from that mark at all - not to mention EQ+Torrent HP more or less eke out the same damage as two HPs under these circumstances. Factoring in that Hydro Pump could MISS and Isabel could get a bit lucky with crits and maybe even swings... yeah, think this is Isabel's fight.
Mitsuru (Pers3) vs Jeane (Suikos) - lol ohko.
Twaikin (S3) vs Jude Maverick (WA4) - Pathetic pingfest. Jude probably wins this with MYSTIC POTION BERRY SPAMMING to me, which is just freaking depressing.
Lemina Ausa (Lunar:EBC) vs Sceptile (PKMN) - EBO Lemina is hopeless even when she's hitting weakness, and Sceptile just has so much to screw her over. Even assuming EBC where she 2HKOs him, can't he just Agility => instadouble after Lemina's first turn, Giga Drainx2 (thus healing back into a range where Lemina can't finish him off and whatever she does at best leaves her open to another double and at worst leaves her open to another double where he's under OVERGROW) and finish her off? I mean, besides zomg ohko with omni-weakness hype, but Elfboy debunked -that- already. I mean, unless you take SDs as like 10% or something, but even that's rare. Looking at speed literally would possibly make things uglier.
Light:
Katarina (S4) vs Hugh Thompson (PS2) - I suspect Katarina OHKOs here, and she has enough mdef to stave off a turn one ID slinging even if she's slower. If she's faster, this isn't even a question.
Shady Thousand (WA3) vs Isadora (FE7) - Dear god, Shady 3HKOs something. And he 3HKOs first.