Ghaleon (Lunars) vs. Naesala (FE9) - I will freely admit to being capricious in my interpretations when it comes to annoying returning champion Godlikes. So... Naesala boss form hype away, for this match at least I'll see it as legal. Obviously the boss form doesn't win if Fate Storm still works, but.... that's hard to test, since there are no FE8 Assassins in FE9. I'll assume Naesala is ID-immune.
Ghaleon is, weirdly enough, punished for being double-acting rather than having one big super powerful spell. Tornado does ~85 damage to a ~240 HP average, so .35 PCHP damage roughly. However.... FE resistance kicks in first, then the weakness bonus. Naesala has completely stupid Def and Res scores for when you encounter him - 21 Def, 16 Res. Checking Soren's growths... a lvl. 20/4 Soren should have ~20 Magic, with +2 damage for Wind (possibly up to +7 if you forged a fancy tome for him). So, the best damaging mage can do 6-11 damage to that Resistance normally. Since we should factor in others, let's say 5 damage is where average magic damage ends up. The stat topic lists 16 as average damage normally for that level, so Naesala subtracts .275 PCHP in magic damage from attacks. This means that Ghaleon is doing .35-.275 = .075 PCHP damage before weakness, and .15 PCHP after factoring it in. If we allow Ghaleon to just spam Tornado (which I don't normally do), Naesala has ~1.5 PCHP = 10 Tornadoes. Which is like 6 Ghaleon turns if he wants to throw up Chaos Shield, which he does. Meanwhile Naesala pretty much murders anyone without a Laguz guard on his doubles, doing, according to the stat topic, 1.05 PCHP on his doubles (which sounds low). Granted, Ghaleon's got really solid defense too, backed by a Chaos Shield... it'd probably take 5 Naesala turns to kill Ghaleon ignoring Chaos Shield?
So. Ignoring Chaos Shield, they both take 5 turns to kill each other; with it, they both take 6 turns. Except Naesala goes first. Except... Naesala runs out of transformation juice on his 6th turn! His boss form doesn't have a Royal Band. Well sucks to be him.
And I so wanted to vote for Naesala here, too. Amusing match, though.
Valvalis (FF4) vs. Vandesdelca Musto Fende (TotA) - Yeah, Van wins with his magic.
Heavy
Kornell (G3) vs. Maria Traydor (SO3) - Really close match to me. Maria's Energy Burst does something like 1x PCHP? And it blows up the Iron First in the process. Only problem is that for Maria to win, she needs to go first, and not only survive Kornell's turn, but have enough HP to spend on two Strong-attack Energy Bursts. Since Maria going first is rather questionable - she's a slow walker, even if for gunfire it doesn't really matter - and she's got eh HP vs. Kornell's brutal attack, so she might not be able to afford the Energy Bursts after all, which is fatal.
Edgar Roni Figaro (FF6) vs. Lyndis (FE7) - There's a slight interpretation issue here. In FF6, it's legal to attack yourself normally, and Noiseblaster makes you do it. In Fire Emblem, it's not legal to attack yourself or allies normally, and going berserk will only make you attack anyone (including nearby allies), but never attack yourself. Under Edgar's preferred interpretation, sure, Noiseblaster lock away as Lyn kills herself. But otherwise... Lyn opens with a double. Edgar Noiseblasters from Long Range (or short range if Lyn used a Bow for some reason). Lyn does nothing. Edgar Air Anchors. Lyn continues to do nothing. Edgar Bio Blasters (!), but "wakes up" Lyn. Lyn will get one more attack on Edgar before dying, and checking... Edgar's defense isn't special, so yeah, 3 Lyn attacks do him in. I suppose Edgar will equip a Pearl Lance for WTA, and has some Evade, so Lyn might miss... but under Lyn's favored interpretation, she still wins most of the time.
Dias Flac (SO2) vs. Percival Fraulein (S3) - See DHE. Middling in-game respect for Dias anyway.
