This is an unearthly coincidence. I was actually thinking about posting a Plot Power tourney of my own tonight, and see I was beaten to it by an hour. Wow.
Godlike
Kefka (FF6) vs. Belial (WA4) - This is a tough one. By all rights Belial should be super-godlike and unstoppable (create nether realm without ground, splat), but she can be/was goaded into a "fair" fight with her powers depleted due to creating too large a dimension. And Kefka is certainly an excellent taunter (see: Cyan). The problem is... even with plot powers go, Kefka still loses the fair fight. He still has to get around Belial's damn barrier, which as the DL proved, he can't really. Unless you allow the Light of Judgment even in a plot power tourney? Nah.
Empyrea (DQ8) vs. Luther Lansfield (SO3) - Empyrea was just toying with the party in DQ8, and is a godlike entity that exists between dimensions (see: DW3 connection). The master programmer is merely very powerful. If he'd been smart enough to program in a delete option and had fought the final battle via deleting the characters, that'd be one thing. Deleting the DL in general will kill him as well in a draw, so that's a no go. In fact, on second thought, it won't even kill Empyrea- see the previous "can travel between dimensions" thing. If he deletes the Eternal Sphere, she just flies out while he kills himself, because he can only delete it from inside it (WTF?).
Patriarch Sergius XVII (XS2) vs. Ultros (FF6) - Cathedral, heavy vs. comic relief.
Zio (PS4) vs. Chaos (FFI) - Minion vs. Time loop hype.
Heavy
Darkham (AtL4) vs. Carlie (SD3) - Darkham's main power is determination + guns, but he's arrogant and overconfident and has the usual villain foibiles. Carlie... if she was at all a tricky type or even a generic hero, I might give her the nod, but she's just a kid who can't speak right. Failure.
Clive Winslett (WA3) vs. Kanon (WA2) - Ooooh, close. Battle of the WA badassess. Kanon is ultimately beaten down, while Clive never really loses, and comes in single-handedly to save the party at one point. Clive also has the range advantage and is probably trickier/smarter.
Popoi (SoM) vs. Brad Evans (WA2) - The Sprite is a bit of comic relief. The magic might be a problem, but eh, Prisoner 666 of the Slayheim Liberation Army has a railgun and probably first strike.
Serge (CC) vs. Malik Benedict (WA3) - Serge's special power is that his DNA opens the way to the Frozen Flame in Chronopolis. Okay, and he can use the Chrono Cross too. That is it. Malik, however, does have powers that actually apply here.
Middle
Marisa (FE8) vs. Luna (Lunar1) - For sanity's sake I'm taking not-endgame Luna here (since Althena is almost an autowin even in Godlike). Doesn't matter; Luna sings her Black Dragon song and makes Marisa get sick and useless. Like Miang, she's pretty much an autowin against women.
Gafgarion (FFT) vs. Rand (BoF2) - Gaff is pretty competent in game.
Shana (LoD) vs. Rath (FE7) - Oh, fly for extra arrow damage! Being the Seed of Destruction or whatever doesn't actually help that much; hard to tell what it actually would have done, thanks to the weird plot dodge at the end of the game where she randomly doesn't become the 108th race out to devour all humans. Too bad for her in this tourney she didn't.
Mog (FF6) vs. Sarah (SF2) - Abstain.
Light
Galleon (S5) vs. Amada (S2) - Queen's Knight, shown as pretty awesome after the wedding banquet.
Sid (S2) vs. Guido (G1) - Guido tells Sid that there has to be another way, and a path suddenly appears! ...not that this helps.
Hrist (VP1) vs. Priscilla (FE7) - VP1 Hrist is mocked in-game for attacking Brahms too early before she regained her full strength, but VP is kinda off the charts on power scale in general, where normal humans are barely able to keep up with level 1 Einjerhar.
Shante (AtL2) vs. Seth (FE8) - Seth is a handpicked bodyguard and all.
Bonus:
Justin (G1) vs. Rune Walsh (PS4) - Justin always finds a way, somehow.