Godlike
Rupert Dandridge (Wild ARMs XF) vs Ryu (Breath of Fire III): Ryu3 beats limit bosses. He just does. Even if he somehow doesn't OHKO, he doubleturns... etc.
Ferham (Mega Man X: Command Mission) vs Tir McDohl (Suikoden Series): If Tir is very lucky, he'll 3HKO. In this case, though, he is 4-3'd, but can survive four Ferham turns, wins. He might fail to 3HKO though. In that case, 4HKO, but his opener is Black Shadow so he doesn't hit limit until turn 3... which eh. Means Ferham gets five attacks. One of 'em should miss, and hell, she may not 5HKO anyway. Ferham really needs to live long enough to get three attacks under half HP to reliably spoil Godlike PCs... granted, with her speed and HP she'll usually get them! Not this time though.
Arceus (Pokémon) vs Fou-Lu (Breath of Fire IV): Arceus doesn't like Dark Wave. But he does like Judgement ripping into Dark Wave, letting him live. Think Normal's the way to go here, and also think Arceus wins, but could be wrong. Meeple may correct me.
Heavy
Marino (Mega Man X: Command Mission) vs Bosch (Breath of Fire V): Wish I remembered Bosch better, but I think Marino can handle this.
Radha Byraban (Super Robot Taisen Series) vs Evans (Breath of Fire II): Oh hey infinite Alert against someone not fast.
Clarissa Arwin (Wild ARMs XF) vs Zerase (Suikoden V): Sacrifice is ITD, so... hmm. IIRC nothing ever resists it short of immunity, guess this works...
Middle
Leonardo (Fire Emblem: Radiant Dawn) vs Robo (Chrono Trigger): IIRC, Lughnasadh made Leonardo annoyingly good in the DL. The Dawn Brigade: Making me consider unequal levels in Fire Emblem since 2007.
Flay Gunnar (Mana Khemia: Alchemists of Al Revis) vs Beatrice (Wild ARMs 3): Assuming MK had a sleep blocker. It certainly had a sleep status, so.
Light
Ilyana (Fire Emblem Series) vs Nina Wyndia (Breath of Fire III): Doubles and counters means a trade. Neither's really good at damage, both have okay mdur... I imagine that Nina going first and having WTA on the only spell that damages her (Fire) gives her the edge, though I could be wrong.