Sacred Slayer:
82% speed, can heal 27 times before running out of MP (assuming no Fragile nonsense, and that duration is pretty bad anyway).
The XF generics damage average throwing out Gadgeteer is ~103, and arguably a tad even lower including some special classes. So... .37 PCHP damage @ 60% accuracy. Taken at lower weapon levels, accuracy problems might get even worse. EDIT: Whoops, that's 37% of average damage, or an amazing .14 PCHP when it hits. More like .8-.9 PCHP over time. Ow.
Sacred Slayer vs Allen (XS3) - Some sort of super-move or boost.
Sacred Slayer vs Kain (FF4) - Blood Spear until the healing or VP runs out.
Sacred Slayer vs Noel (SO2) - Horrible MP draining.
Sacred Slayer vs Black Wizard (FF1) - Status.
Sacred Slayer vs Aeris (FF7) - Seal Evil.
Sacred Slayer vs Brey (DQ4) - Huh, neither Zenny nor hinode even listed attack damage for Brey if he Bikills himself. That said, there is Poison Needle (no way does magic damage work here). Brey is... 2HKO'd, but at poor accuracy, so call it more like 3HKO'd. Can Brey get a Poison Needle proc off in 3 attempts? super claims its hit rate is like 20% so prolly not. There's a Sleep game as well, but that also has problems. EDIT: Wait, no, SS's offense is so much worse than I thought.
Sacred Slayer vs Arietta (TotA) - Not really a Light to me.
Sacred Slayer vs Mogu (BoF1) - Mogu 4HKOs without crits, so SS can safely heal after 2 hits. And if a double is incoming, heal up to full and only lose to two crits in a row. No.
1-7
Ilyana vs Allen (XS3) - Heal a lot then boost? ...nah, Ilyana's crit rate wasn't great (Tallychu claims enemy average luck is 5-7), but it wasn't horrible at 10 crit, she'll zap first.
Ilyana vs Kain (FF4) - Kain doubles and apparently FF4a gave him Lightning resistance gear so Ilyana's damage is even worse than usual by switching to Wind. Which arguably Kain "counters" anyway since he's supposed to be good vs. Valvalis or something.
Ilyana vs Noel (SO2) - Noel punches too weak even against Frail Ilyana, and if he heals he burns MP like crazy because his heals aren't very good. And Silence is like turn never vs. Ilyana Res. He can even force Ilyana to equip a Fire tome via nulling Lightning & Wind and it doesn't matter.
Ilyana vs Black Wizard (FF1) - Super resistance to the rescue!
Ilyana vs Aeris (FF7) - Ilyana can't chip around Seal Evil.
Ilyana vs Brey (DQ4) - The good: Brey doubles! The bad: he's hitting the wrong defensive stat. EDIT: The ugly: Bounce.
Ilyana vs Arietta (TotA) - Dark > Arcane yo
Ilyana vs Mogu (BoF1)
4-4. Counters are still pretty good it turns out.
Thief (Male) vs Allen (XS3)
Thief vs Kain (FF4)
Thief vs Noel (SO2) - Noel doesn't particularly care if his stuff gets stolen. EDIT: Maybe? Apparently Noel's weapon does give him magic power, so maybe not, but eh, Thief will probably be at death's door fast with no Aegis Shield.
Thief vs Black Wizard (FF1)
Thief vs Aeris (FF7) - After Zack left her, Aeris will date bascially any guy she sees. and "loan" her staff & armlet to them. Although apparently Aeris loses less damage from going staffless than I thought... she might well beatdown faster even post-theft! and at least threaten a Healing Wind. Goddamn it, switching the vote to naked Aeris.
Thief vs Brey (DQ4)
Thief vs Arietta (TotA) - Bad Thief. She's too young and also a boss.
Thief vs Mogu (BoF1) - Wins the slugfest. alternatively dude where's my claws
1-7. Equally as bad as Saced Slayer. Thief-F... isn't much better off, Allen/Noel/BW all block the status and she probably loses to Aeris, but maybe beats Brey. Same result in the end.