Red XIII (FF7) vs. Byleth Eisner (FE3H)
Normally, FE characters are good vs. Limits because they can chip around them, and normally FE characters are good at slugfests because they get free counterattacks, but... these two aspects work against each other here? I'm pretty sure counterattacks in FF7 still fill the Limit Gauge. So a vanilla strategy is:
R13: Attack, Byleth counterattacks with SotC
B: Brave Sword attack
R13: Attack, Byleth counterattacks with BS (1x hit)
Red has taken 30+50+25 = 105 FE3H damage, which still isn't a KO to average. But that last counterattack probably sets up a Red Limit, so even if Red is just running the vanilla L1 Sled Fang, this should still 3HKO Byleth, assuming Byleth didn't evade or get multiple healing procs or the like. But given that Limited Moon is listed at 114% base accuracy, I think Red actually takes this. Byleth can equip an Iron Sword or something to reduce the damage of the first counterattack, which if this is seen as preventing an L1 Limit might be the right call, but then Byleth risks not KO'ing on their second turn and needs to gamble on getting Crest of Flames (but only in their second attack, not too early and thus handing the Limit over anyway!). Seems Red-favored.
Virginia Maxwell (WA3) vs. Heather (FE10)