I vote on act 2 in principle... but we don't have numbers for that. Fortunately act 3 is close enough to my memories generally. For Sylvando, the main thing he loses is Last Stand I guess, and his statusblockers get worse.
Sylvando (DQ11) vs Golem (PKMN FRLG): Depends how good Sylvando's status is? Golem 2HKOs but Sylvando can probably land a status before then... maybe? Yeah, Pied Piper looks good enoguh for this, especially since Sylv can be safe and heal after it lands.
Sylvando vs Red Mage (FF5): Faster, lands some sort of nasty status first.
Sylvando vs Alice (SH1): Just tosses out charm and healing until Alice runs out of SP.
Sylvando vs Meru (LoD): Gets 400 SP then goes dragoon and should just overwhelm him at that point, I think? She's so much faster.
Sylvando vs Leo (Lunar:EBC): Leo's not so different than Golem.
Sylvando vs Rasputin (SH2): Should be able to attrition this out. Rasputin has an argument if you see SP Lowering doing anything to non-SH characters, too bad I don't.
Sylvando vs Umaro (FF6): Umaro kinda sucks against healers.
Sylvando vs Tim (WA2): Charm and overwhelm.
Sylvando vs Logg (S5): Yep.
Sylvando vs Ruprecht (SO2): Ruprecht sucks.
Sylvando vs Oswin (FE7): Sylvando 5HKOs, but doubles. Oswin 3HKOs with a Javelin. Oswin wins that slugfest. Sylvando can heal but not really press an offence outside of charm. So he alternates charm and healing... except he needs to charm a lot more than he heals, and I don't think I'd see charm shutting off counters.
Endir (I Am Setsuna) vs Golem (PKMN FRLG): Magic damage blitz.
Endir vs Red Mage (FF5): Endir's a little faster, but doesn't win with one turn.
Endir vs Alice (SH1): Can out-turtle her. Might even be able to blitz since mdur is Alice's weak point.
Endir vs Meru (LoD): I don't think Endir can open with Battlecry/damage, because Meru just doubles him right after and murders? (She gets 3 turns before Endir gets 2.4) And without that level of opening pressure, Meru's free to just start tossing some mix of physicals and Freezing Rings to tie up Endir until she doubles him I think. Open to arguments though.
Endir vs Leo (Lunar:EBC): Probably. Faster and controls the fight generally.
Endir vs Rasputin (SH2): I think?
Endir vs Umaro (FF6): Heals and smites. Umaro offence sucks.
Endir vs Tim (WA2): Battlecry->Meteo isn't anywhere near OHKO normally... but it is with momentum (it's around 90% damage then) and Endir gets that pretty fast if he waits? Like before Tim's second natural turn. And Tim isn't doing much with one turn.
Endir vs Logg (S5): Both have a very hard time breaking past each other's healing... but Endir needs to spend MP to make Logg heal? A bit? Actually not really, once he has momentum, he can threaten with two physicals. Logg, meanwhile, makes Endir heal with three physicals (each heal erases two, so they're even after the opening shot, which offsets Endir's need to amass momentum). But the rest... Endir is faster. Endir can only heal 10 times before eating into his kill, but Logg can only heal 6 times, period. It adds up to a clear Endir win.
Endir vs Ruprecht (SO2): Nope.
Endir vs Oswin (FE7): Oswin's a tough customer to blitz. Meteo only does 28%, 46% after Battlecry. Two Battlecry-Meteos don't win and they eat all his MP! Endir can build momentum by healing off Oswin's strikes I guess? But that... massively eats into his resources. He can also just skip a turn early in the fight but again he'll need to heal to live. And one momentum Battlecry+Meteo plus one regular Meteo still isn't enough to kill. Oswin is just too much better than Logg; can't be threatened with physical damage, more mdur, kills in one hit less. Don't see how Endir can take this.
Caspar (FE3H) vs Golem (PKMN FRLG): Probably one-rounds with Silver Gauntlets, doesn't have to.
Caspar vs Red Mage (FF5): Caspar is horrifically status-bait.
Caspar vs Alice (SH1): Even is Caspar quads (itself not a given), he misses a 2RKO, before Gospel.
Caspar vs Meru (LoD): One-rounds with a Brave Axe.
Caspar vs Leo (Lunar:EBC): Probably quads, so that's too much offence.
Caspar vs Rasputin (SH2): 2RKO with Brave Axe.
Caspar vs Umaro (FF6): Just gives Caspar too much time. Doesn't help that he triggers counters sometimes. (YOU KNOW, LIKE IN-GAME. SCREW YOU UMARO.)
Caspar vs Tim (WA2): Someone else slow enough for Caspar to quad, and this one just dies outright because it's Tim.
Caspar vs Logg (S5): I don't think Logg's slow enough to get quadded to me (could be argued), so he's only 3RKOed, but... yeah the counters are too much. Unless ICY POISON can save him. Land that right away and heal until Caspar is in kill range? Honestly that probably works. Helps that Logg has a little flexibility to reapply it if it wears off (not sure if it does).
Caspar vs Ruprecht (SO2): lulz.
Caspar vs Oswin (FE7): I dunno if I take Oswin's 4.5 pdur literally all the time, but against gauntlets? Yeah for sure. And since Brave Axe doesn't double I doubt Silver Axe is going to notably exceed gauntlet damage even with some subtractive defence adjustment. And taken literally, Caspar 6RKOs (including his doubles) while Oswin 3RKOs. No amount of crit hype is gonna tilt that for me.
Ramza (FFT) vs Golem (PKMN FRLG): Even if you don't see Ramza doubling in time, Earth Clothes/Twist Headband/Ice Brand 3HKOs while not being 2HKOed back by Rock Blast.
Ramza vs Red Mage (FF5): Ramza has a bunch of tools to slow Red Mage down, between Aegis Shield and various blockers but... is it enough? Ramza surely blocks sleep (otherwise RM has an accurate spammable match-winning option), RM responds with Toad+Mini. If Ramza keeps the Thief Hat he fails to 2HKO so Red Mage just alternates status with healing at worst. If Ramza goes for Twist Headband he can 2HKO but now Red Mage is faster, hard to believe she can't land something decisive in four status attempts. ... and Red Mage even has Protect, yeesh. Not actually close.
Ramza vs Alice (SH1): Physicals bad here, Ultima it is. Even with his +mag setup, Ultima is a 3HKO on Alice at best (her Mdef might push that down further), which doesn't work against a healer. Alice alternates heals and books until Ramza's in kill range (Ramza's HP is garbage with the Wizard Robe he needs for a 3HKO).
Ramza vs Meru (LoD): Ice Shield goes a long way here. Headache of a match, Ramza 2HKOs Meru outside dragoon (4HKO otherwise). Meru can heal half her health. I think she goes for her 400 SP build to get four turns in a row of dragoon. She'll need to heal on turns 3 and 5 (detransforming after), repeat on 8 and 10, repeat on 13 and kill on 15? That's... five physical attacks in dragoon and three outside, before any doubles. That probably works actually. Huh. Ramza can try for assassin instead I guess, at that point he puts on way less pressure so Meru gets more attacks in, and I *think* she still wins but it's closer. Admittedly this last part is somewhat a kneejerk against Assassin Dagger whenever possible vote.
Ramza vs Leo (Lunar:EBC): Ramza is faster and 4HKOs if he's lucky, Leo isn't failing to 3HKO.
Ramza vs Rasputin (SH2): Think so.
Ramza vs Umaro (FF6): A good test for how far Umaro has fallen in my views. Ramza 5HKOs, Umaro 4HKOs. A timely shield block might save Ramza but Umaro can dodge too and Umaro's attacks have a 63% chance to be ITE (and that's where his better damage comes from to boot), so... I don't think so.
Ramza vs Tim (WA2): Power-optimized Ramza does indeed 2HKO while still being faster. Tim's only hope is to do something decisive in one turn. And... actually he can do that, Tim's 100 FP summon surely OHKOs a Ramza who has dumped his HP with a Twist Headband. The issue here is... ugh, speed interp issues. So in-game if Tim is 2HKOed by someone faster he can't ever stop spamming First Aid because as soon as he does he gets doubled immediately and dies.
Ramza vs Logg (S5): Ramza may not even 3HKO with power optimization, and at that point it's a tossup as to who's faster to boot. Even if you make both calls for Ramza, that's a lot of times for Logg to alternate healing and attacking, enough to win since his damage isn't horrid (3HKO against power Ramza).
Ramza vs Ruprecht (SO2)
Ramza vs Oswin (FE7): Ramza can magic-optimize Ultima and watch it still only 4HKO while he now dies in two hits, that'd be great. If you see Ultima doubling (I'm not sure) it can also be countered so I don't think that helps.
Kylin is slow, frail, but has turn 2 instant death. How far can that go...?
Kylin (SaGa) vs Golem (PKMN FRLG): Sturdy blocks death... but Kylin blocks ground. Kylin 5HKOs but should 5-4, so Golem gets three Rock Blasts. That probably kills. Kylin wishes its stun rate wasn't 0%.
Kylin vs Red Mage (FF5): Red Mage really needs toad to work, since Kylin immunes everything else. Kylin has to not be immune to it, then Red Mage has to land it through Kylin's status defence (and doublecasting it is very dangerous!). The fact that Toad has terrible coverage in FF5 makes me kneejerk for Kylin here.
Kylin vs Alice (SH1): Alice can block death, which leaves Kylin trying to stall with regen? Yeah I doubt that works, Alice damage is fine here.
Kylin vs Meru (LoD): Not with that ice defence, pal.
Kylin vs Leo (Lunar:EBC): Kylin's barely faster, lands Vanish before dying. Leo can outspeed with a much weaker sword but I doubt he 2HKOs with that.
Kylin vs Rasputin (SH2): Instant death immune.
Kylin vs Umaro (FF6): Not instant death immune.
Kylin vs Tim (WA2): Tim has Thanatos X! So as long as Kylin doesn't ID him first try, Tim wins easily (First Aid easily destroys Kylin damage). EDIT: whoops, forgot about Vortex. Yep, Kylin wins that confrontation, eventually landing Vanish attempt #2.
Kylin vs Logg (S5): Logg is a bit faster but fails to 2HKO, so Vanish does its thing.
Kylin vs Ruprecht (SO2): Oh dear god what is this. Kylin's regen shuts down Ruprecht's damage, but could the MP damage run Kylin out of JP? Probably not, especially since Kylin might well immune it.
Kylin vs Oswin (FE7): Faster, 2HKOs, his Res is actually average so Vanish isn't turn 1.
Endir 8-3
Sylvando 8-3
Caspar 7-4
Kylin 6-5
Ramza 4-7
This field is certainly more Middle than it is Light, but Ramza probably is closer to the border. The others are varying degrees of better, but none are close to Heavy I don't think.
Speaking of the field:
Oswin 5-0
Red Mage 4-1
Meru 4-1 (though she was closer to losing matches than RM certainly)
Alice 3-2
Logg 2-3
Golem 1-4
Leo 1-4
Rasputin 1-4
Umaro 1-4
Ruprecht 0-5
Tim 0-5