Knights (FF1 Knight, FF5 Knight, Squall, Steiner) vs. Thieves (Locke, FFT Thief [female], Zidane, Rikku*): Between Rikku MT status and Zidane there isn't a knight who is going to get a (useful) turn here.
Samurai (FF5 Samurai, Cyan, FFT Samurai [male], Auron) vs. Dark Knights (FF3 Dark Knight, DK Cecil, PC Gafgarion, PC Seifer): DK Cecil is going to do some bad things here probably, although he's turn 2 to ID the tastiest target so maybe not. This is tricky and I'll await others. EDIT: As per below, I think FF5 lives to get Iainuki off, and either gets a second turn to do more terrible things or the team focuses on her to the exclusion of the others and likely get killed by FFT stalling + Cyan using Cleave.
Monsters (Gau, Cait Sith, Vincent, Red XIII) vs. Time Mages (FF5 Time Mage**, FFT Time Mage [female], Tidus): Screw X-Zone, with Reset banned it's not all that accurate and the monsters all want to block slow... except FF7 can't so yeah, sure, they block ID, whatever. Tidus opens with Slowga which only Gau blocks, Gau gets a turn and does whatever, we'll get back to him. FFT time mage can now safely drop Meteor before anyone on the other team gets a turn.. but that triggers a lot of limits, probably a bad idea as such. FF5 TM will obviously Hastega on her turn, and do something else. ... oh, I know! Stop on Cait Sith. That wins the fight pretty handily. So Cait Sith blocks stop instead, actually, since the ID isn't nearly as accurate. TM could also use her second turn for Void, as Pyro notes, though I'm leery about hyping that given how it is randomly immuned by the battlefield. Otherwise, I dunno. Regardless, due to haste one turn into the battle, Tidus can get a barrage of quick hits off before FFT Meteor hits, I would think, and Cait Sith is going to die anyway. Gau at this point gets the fatal turn with a rage, maybe charming someone or whatever... except charm's probably turn 3 here overall, certainly is if it targets FF5 who has some MEvade, and the other two being charmed isn't THAT big a deal as once Cait is gone the other two can pretty safely nuke Gau before he does anything else. It's certainly possible that monsters pull this out thanks to Gau, but I'm kinda inclined to vote against them... doubly so since this is a slaughter if Reset is allowed and it feels arbitrary that it isn't. *shrug*
Summoners (Rydia, FF5 Summoner, FFT Summoner [female], Garnet) vs. White Mages (FF3 Devout, Rosa, FF5 White Mage, Eiko): Garnet is the fastest one here, uses Odin to wipe out two of the white mages. One of Rosa and 5!WM will live and MUST stop FF5 Summoner from living to get a turn... but that still leaves Rydia. Yeah, think Garnet winning the crucial quickdraw here is too much for the white mages to come back from.