Luca (TAY) vs Guy (Lufia 2): 3HKOs, isn't 3HKOed. IPs only tilt this more in his favour.
Luca vs Mareg (G2): As above, only Mareg is faster than Luca anyway. Luca might actually succeed in 3HKOing him but it doesn't matter.
Luca vs Bow (BoF2): Healing.
Luca vs Rafa (FFT): Luca 3HKOs, Rafa 4HKOs (takes 5 rounds to kill on average), but any time she hits herself offsets more than a hit from Luca, and she's faster. So basically she needs to heal at least once in turns 2-3, and at least once again on turns 3-4. She has a 51% chance to heal each turn. I think overall she wins this on average... around 57% of the time? I guess I could be argued that I should demand 67% odds from this but eh, holistically these numbers are an underestimate because sometimes you can reduce Sky Demon's size. So 50% threshold works.
Luca vs Sazh (FF13): Brave/Protect, then 3HKO while not being 3HKOed (or even 4HKOed).
Luca vs Ilyana (FEs): Can withstand 3 attacks and 2HKO if the second attack is Big Throw. (One Big Throw does not get her 3-2'd.) That's assuming she doesn't resist elements.
Luca vs Cotton (Saga): 2HKOs, which is all you need to beat Cotton. Hooray for slashing damage.
Luca vs Zieg (LoD): Zieg is pretty bad.
Luca vs Nina (BoF3): Nina is also pretty bad.
Luca vs Freed Y (S2): 3HKOs, isn't 3HKOed. Both are pretty average outside of Luca's HP.
Tita (Trails) vs Guy (Lufia 2): Blind then petrify eventually. Guy might be able to do this if Torrent is magical but the odds are still against him due to speed and Tita's ability to pull out an S-Craft if she regenerates the SP from the initial blind.
Tita vs Mareg (G2): Blind not being useful means beastman smash.
Tita vs Bow (BoF2): Blind can be healed away, damage can be healed away, confuse just makes Bow attack her. Nothing Tita does sticks, here.
Tita vs Rafa (FFT): Rafa is kinda fragile so Tita can win on her second turn if Rafa doesn't heal the first. Of course, on average, Rafa does heal on the first. So Tita won't win until her third turn. Unfortunately for her she's dead by then.
Tita vs Sazh (FF13): Needs to blind and then confuse, but Sazh can leave her almost dead before then, so I doubt that works.
Tita vs Ilyana (FEs): 2HKOs, this is easy.
Tita vs Cotton (Saga): Petrify.
Tita vs Zieg (LoD): Um she possibly one-rounds, certainly needs two turns at most and Zieg doesn't 2HKO anything.
Tita vs Nina (BoF3): See above, replace "Zieg" with "Nina".
Tita vs Freed Y (S2): Just faster, so this is another victory via blind.
Black Wizard (FF1) vs Guy (Lufia 2): Guy MDef is below average, it doesn't take much to make Break turn 2.
Black Wizard vs Mareg (G2): See above.
Black Wizard vs Bow (BoF2): Bow has no way to close the deal here.
Black Wizard vs Rafa (FFT): Rafa blocks stone and optimises her physical otherwise. She 3HKOs and outpaces any other status or damage.
Black Wizard vs Sazh (FF13): Does Sazh 2HKO here without buffs? Um, wow.
Black Wizard vs Ilyana (FEs): All of BW's worthwhile attacks ignore both doubles and counters. Ilyana has no trouble just outslugging though; she 2HKOs.
Black Wizard vs Cotton (Saga): Break.
Black Wizard vs Zieg (LoD): Zieg 3HKOs. Does BW 2HKO before then? Do I see Zieg below 0.74 mdur? ... yeah, I probably do.
Black Wizard vs Nina (BoF3): I assume her Int takes at least 11% off spell damage. Could be wrong of course. See Snow then, she 3HKOs first.
Black Wizard vs Freed Y (S2): Freed 2HKOs and though he goes second, his MDef is average so he doesn't succumb to BW status.
Black Wizard 5-5
Luca 5-5
Tita 5-5
All lights are equal, but some are more equal than others. They did largely beat different opponents which was at least interesting.
Rafa, Sazh 3-0
Mareg, Bow, Ilyana 2-1
Guy, Nina, Freed 1-2
Cotton, Zieg 0-3