Godlike
Oz (The Wizard of Oz: Beyond the Yellow Brick Road) vs Rika (Phantasy Star IV: End of the Millenium): Rika can deal with everything Oz does! ... except the fact that his buffed magic damage one-rounds.
Reicher (Mana Khemia 2: Fall of Alchemy) vs Sergius XVII (Xenosaga: Jenseits von Gut und Bose): Not sure if I see Reicher's main damage as slashing or piercing offhand, but I don't think it matters. He doesn't lose durability by that much and his offence is way better.
Heavy
Arycelle Dania (Tactics Ogre: Let Us Cling Together) vs Auron (Final Fantasy X): Um okay, mathing this one out since it's hard.
Auron: Power Break. 14% to Arycelle, gives her 7 TP, cuts her damage in half. Due to lag he'll BARELY avoid an instant double from Arycelle.
Arycelle: Attacks Auron. 29% damage, gives her 10 TP.
Auron: Counter: 28% to Arycelle, gives her 14 TP.
Auron: Attack. 28% to Arycelle, gives her 14 TP.
Arycelle: Tremendous Shot: 44% damage. This lags her a bit but not enough to avoid doubling Auron which she almost did already. It also ignores counters.
Arycelle: Attack. 29%, Auron is dead.
Weirdly enough Auron would be a bit happier if Arycelle DID instant double him, but I don't think it would change anything. It'd pump up his attack but only to about 48%, which Arycelle could still take once since she didn't trigger a counter doing it.
Auron could also miss (haha dealing with FFX vs. TO evade, no) which would instantly doom him. On the other hand he does win if you see him countering Tremendous Shot.
Middle
Eleni Dunbar (Vandal-Hearts) vs Axl (Mega Man X: Command Mission): Axl does hate healers, so this is tough. Eleni can only heal four times, though. I dunno. He could try for Mad Nautilus which probably does something really bad on the second attempt. Depends a lot on how good Eleni's damage is to pressure him from the other end.
Light
Jagen (Fire Emblem: Shadow Dragon) vs Andre (Shadow Hearts: Covenant): Jagen is really terrible, Andre is a pretty good Light.
Allen Ridgeley (Xenosaga: Also Sprach Zarathustra) vs Kain Highwind (Final Fantasy IV): Does Allen seriously lack a stat topic entry? Wow. Anyway, probably Kain. I remember Allen's healing being pretty bad, as in, so bad it doesn't scare Kain bad.