Godlike:
Winners:
Shania (SH:FtNW) vs. Mewtwo (PKMN): Mewtwo going first and putting up Amnesia should put any Shania quick kills out of reach, and from there on he can pile on more defensive buffs. Shania doesn't really have meaningful crits to get through this. Non-RBY Mewtwo struggles to put Shania away and turns this into a horrendous stall-fest but I vote on RBY, so.
Melfice (G2) vs. Elyon (BoF5): Yeah, Melfice is definitely speed over raw damage and that hurts against Absolute Defence.
Losers:
Worker 8 (FFT) vs. Terra Branford (FF6): Morph Man Eater actually isn't horrid damage, and she can turtle using Cura against Work, or wait for evasion against Worker physicals. She can survive a counter + Crush, to boot, so she should really be in control here.
Nailah (FE10) vs. Velius (FFT): Velius is probably on the right side of average speed, yeah, he is very thankful bosses win tiebreaks.
Heavy:
Winners:
Clarissa Arwin (WA:XF) vs. Lady Elmina Harken (WA:ACF): And this is why you can't really put Sacrifice into the damage average with no asterisks. Harken goes first, doesn't have any fatal status or OHKO damage, but still renders Clarissa offensively inept.
Hildegarde Valentine (SH:FtNW) vs. Nel Zelpher (SO3): SO3 has a death blocker, SH3 does not have a freeze blocker.
Losers:
Asellus (SaGa) vs. Summoner (FF5): Sure I'm willing to buy the stat boosts from Mystic Change warding off a turn 1 stone/death, so Asellus can go first and 2HKO with Mystic Sword -> Lifesprinkler.
Geno (SMRPG) vs. Celica (FE:SoV): Whirl'd.
Middle:
Winners:
Jude Maverick (WA4) vs. Jessica de Alkirk (L:SSSC): Pretty sure Jude just does his blitzy thing too well. If he escapes sleep at any time he has a 2HKO with Rapid Attack into Assault Buster.
Tifa Lockhart (FF7) vs. MOMO Mizrahi (XSs): Probably. MOMO can chip and buff to avoid anything but a L1, can half damage to tank a L1, and can heal off Tifa's regular physicals in the meantime.
Losers:
Stocke (RH) vs. Anastasia Romanov (SH2): This seems like a pretty fierce spoiling.
Light:
Winners:
Marianne (FE3H) vs. Hubert (FE3H): Yeah this is very one-sided, Marianne has 1.5 mdur and 20% regen before Nosferatu, and Hubert can't double with anything except a Training Lance which does -6 damage to average.
Zhuzhen Liu (SH1) vs. Annette Fantine Dominic (FE3H): Has MT to get around counters, can alternate healing with damage until he kills Annette's shockingly unimpressive mdur.
Losers:
Millich Oppenheimer (Suikos) vs. Labyrinthia Wordsworth (WA:XF): Is magically tanky so reduces Labby to 3HKO, and 3HKOs her bad pdur first.
Ricardo Banderas (XG) vs. Squire (FFT): Gotta think the pdur tilts this one, Squire is pretty similar to Queen but without any argument for evasion.
*worth mentioning that the Suikoden guy's name is Milich, not Millich.