Godlike:
Uranus (LaL) vs. Giffca (FE9 form ONLY!): Giffca's 9 Move gives him the tiebreak here, I think, and there's no a chance in hell Uranus survives one turn of Giffca.
'Rozalin' (D2 - you know where this is >_>) vs. Croix (LP:T - the level 100 solo fight in the past): Can't vote!
Heavy:
Alys (PS4 - PC form only >_>) vs. White Rose (SaGa Frontier): White Rose in Heavy? She's...no different in the DL taken as a Permanent PC (which is possible in Emelia's path!), than she is in Asellus' Path as a Temp...and I think she's Middle in the DL. Alys...still has Death, forcing a Blood Chalice to lower her defenses to other damage (like, say, Fire), Saner, and Deban to deal with most of White Rose's other tricks.
Jowy Atreides (S2) vs. Lucian (VP1): Basing this off Staff Jowy, if that's not obvious; Sword Jowy exists for too short a time to really consider. Anyway, Lucian's damage is better since he leaves before Bahamut Tears, and the relative damage boost from other weapons isn't much different than Swords anyway, so he's doing the same relative damage vs. Lower Average. The problem? Piercing ONe is absolutely cracked out that if it doesn't OHKO, I'd be shocked when Jowy leaves, and Jowy is faster.
Middle:
Rassius (ToE - PC form only) vs. Minwu/du/whatever (FF2 - Main Game form): White Rose in Heavy and Minwu in Middle? Um, Minwu's better at everything, considering his skillset, stats, etc. You don't realize this in game since you intentionally gimp him being a Temp and are focusing on the other PCs, probably power leveling the **** out of them after he joins, but well, he has that advantage too. Ras, meanwhile, sucks.
Young Teepo (BoF3) vs. Peter Pan (KH): Teepo's game best everything during the temp arc barring Speed, which I know Rei beats him at (the one stat Rei > Ryu, and its significant, Teepo's Ryu with slightly better stats across the board.) How much...well, depends if you allow him Ice Blast, but I know for a fact his Physical > the others, and I think Simoon was stronger anyway. I don't remember Peter Pan having a particularly large amount.
Light:
Yoshimo (BG2) vs. Hien (SH2 - PC form only): Can't vote.
Cid (FF4) vs. Aeris (FF7): Cid's damage when he leaves isn't that bad, from recollection. He's dealing with no mages (Tellah's gone, Rydia joins after he leaves), Rosa's in the party, so yeah. He should have no problem getting around a limit as a result.