Dark Knight (BD) vs T-260G (Saga) - You don't really ever OHKO the trashcan - hell, post-V-MAX, DK may not even -2HKO-, and T-2 certainly won't miss a 2HKO herself and can circumvent Minus Strike with the combo of regen+gross speed advantage. Uphill fight.
Dark Knight vs Chelle (XF) - Predator Barrage is a nightmare.
Dark Knight vs Mewtwo (PKMN) - If you take Mewtwo post-RBY, he loses because lol black bane hitting weakness. EDIT: 2.5x PC HP? Jesus.
Dark Knight vs Zio (PS4) - Nope.
Dark Knight vs Chaos (FF1) - uh. Chaos won't try to hit Dark Knight ever, he doesn't want to trigger Minus Strike here. So, spam Crack. But... DK opens with Black Bane, probably isn't in range of getting killed turn one after the first (Chaos needs to buff to deal truly dangerous damage), then I think Dark Nebula => Minus Strike x3 does him in. Could be argued, once again. This wouldn't hold true if the damage done by the other two Black Banes didn't add up, though.
Dark Knight vs Rubicante (FF4) - No.
Dark Knight vs Renee Kearse (MK1) - Dark Knight goes first and Renee can't really do much of anything to avoid a OHKO.
Dark Knight vs Hiro (Lunar:EBO) - Dark Sword. Oh well.
Dark Knight vs Tosh (AtL2) - You don't let BD Dark Knight get a turn and live if you're below 1.9x PC HP against physicals.
Dark Knight vs Etward Dysler (MK2) - Oh dear, Dark immunity. And it... probably doesn't -matter-, Dark Knight gets pretty viciously durable as her HP goes down and Et starts having trouble avoiding a fatal Minus Strike range. Welp.
Dark Knight vs Kyra Tierney (PS4) - Minus Strike rears its ugly head again. Kyra can't really chip DK down to a range where she can safely end the fight, I think.
Dark Knight vs Eileen (S1) - copper flesh lol
5-6. Interesting performance. Minus Strike is interesting in that it makes Dark Knight dangerous at -all- HP ranges, switching offensive emphasis. Dark immunity doesn't really slow her down either, as shown by what happens to Et.
Wakka (FFX) vs T-260G (Saga) - lol
Wakka vs Chelle (XF) - lol evade & counter => lol sleep buster => lol overdrives
Wakka vs Mewtwo (PKMN) - I actually suspect this is right, even with Wakka hitting a turn one status. Mewtwo isn't really scared of Wakka's tricks outside sleep and gets a huge headstart opener. Past that, Wakka damage sucks and landing a status doesn't -really- get him out of the woods, since ANY turn Mewtwo gets past that is fatal and the speed split's humongous.
Wakka vs Zio (PS4) - No.
Wakka vs Chaos (FF1) - Nein. Even being ITD, Wakka's damage is bad enough to miss a 2HKO on Chaos - and I have no sympathy for anyone who lets Chaos get two turns in Godlike.
Wakka vs Rubicante (FF4) - I remember this match.
Wakka vs Renee Kearse (MK1) - Dude, isn't Renee vulnerable to -sleep-? That's just insulting.
Wakka vs Hiro (Lunar:EBO) - Dark Sword.
Wakka vs Tosh (AtL2) - Monj Slash and Jubakuken aren't physical and Tosh blocks both Sleep and Silence, if you see that working. WELP.
Wakka vs Etward Dysler (MK2) - EDIT: DRAIN
Wakka vs Kyra Tierney (PS4) - Sleep Buster delays Kyra enough until a nasty Overdrive lands on her head.
Wakka vs Eileen (S1) - Welp.
6-6. In Godlike, he's strictly a spoiler, but he's a nightmare in Heavy. The usual.
Rosa Farrel (FF4) vs T-260G (Saga) - I'm not sure I feel comfortable with the idea of Toad working on T-2, but that might not even be necessary.
Rosa Farrel vs Chelle (XF) - Predator Barrage is a nightmare.
Rosa Farrel vs Mewtwo (PKMN) - 3-2s, tanks a -single- turn of status and 2HKOs. Sure.
Rosa Farrel vs Zio (PS4) - If Rosa's even faster than Zio, it's not by much. She probably gets heal-locked.
Rosa Farrel vs Chaos (FF1) - Hopefully. Don't think I see Crack ramming into Reflect.
Rosa Farrel vs Rubicante (FF4) - Oh dear.
Rosa Farrel vs Renee Kearse (MK1) - Multi-hitting does horrible things to Blink and Rosa can't really stop Renee from getting three turns.
Rosa Farrel vs Hiro (Lunar:EBC) - Dark Sword.
Rosa Farrel vs Tosh (AtL2) - I'm not sure Rosa avoids a OHKO here and it's not even -necessary-, since the biggest status she has against Tosh get blocked. Her hope is OHKOing him if she lives to see a turn, but even that she misses by a hair. Berserk, as Random noted, leads to horror and suffering.
Rosa Farrel vs Etward Dysler (MK2) - Bite-sized people aren't very good at tossing hula-hoops, and neither are paralyzed people.
Rosa Farrel vs Kyra Tierney (PS4) - Berserk makes Kyra pretty unhappy.
Rosa Farrel vs Eileen (S1) - As well as Eileen.
3-9. Not even remotely Godlike. The speed's quite problematic.