Belial (Wild ARMs 4) vs Yuna (Final Fantasy X) - 4D Pocket. Alternatively, Agony Effect+Tank Drop should drop Yuna on average (since Belial's quite accurate).
Katrina Liane Elesius (Wild ARMs XF) vs Rika (Phantasy Star IV) - This is a very strong kneejerk. Katrina -barely- lands a 2HKO on Rika and eventually she surpasses her speed even post-Saner, and by a significant margin, which means she'll start eating into Rika's resources pretty fast eventually and land a double well before death (especially with the ST spoiling). Rika has a shot (and a pretty good one at that!) if you see Katrina as vulnerable to Illusion, but even though she's vulnerable to stat downs in her own game, I have problems swallowing Rika doing that to a boss given what happens if you try that in PS4. I'm just not sure.
Levin Brenton (Wild ARMs XF) vs Velna (Legaia 2: Duel Saga) - Uh I don't think trying to cancelspam two targets is going to work out too swell here, Levin.
Emelia (SaGa Frontier) vs Mesarthim (SaGa Frontier) - Well, Emelia 2HKOs Mes with Trick Shot (or crit BoundShot+non-crit BoundShot) and is significantly faster to begin with. Mes can try to HideRune, but that meets whatever the name of that awful MT gun skill is (YES). Mes also could go for GlassShield, but Emelia just equips one of those guns with like 30 bullets to prevent untimely low-speed recharges and troll the hell out of it. VitalityRune is pretty damn risky as a bet to avoid a 2HKO due to Emelia's spiky damage (giving her two turns out in the open on average means death for Mes)... so, her best shot is landing Cockatrice. Which probably already isn't turn one on average. Against Emelia's above average status resist. Iunno, guys. I'm not going to be -too- inclined to make judgment calls for the mermaid this week, considering how her win against Cthulhu was already pretty uncertain (even though I -voted- for her and the way I take a few systemic calls gives her an advantage in that particular fight).
Mystic Knight (Final Fantasy V) vs Flay Gunnar (Mana Khemia: Alchemists of Al-Revis) - Lives to see a second turn. Blocker is a nice thought, but it ain't enough.
Bronzong (Pokémon) vs Anastasia Romanov (Shadow Hearts: Covenant) - Uh, HP-1 means Bronzong can't really let Ana see a second turn ever. I think this is kinda sketchy a proposition.
Ilyana (Fire Emblem Series) vs Irenes (Chrono Cross) - Probably Irénes. Ilyana getting doubled off that pdur is baaaaaaaaaaaaaad.
Draggy (Chrono Cross) vs Melody Vilente (Wild ARMs 3) - eeeeeeeeeeeeeeeew Draggy offense and poison vulnerability against Melody.
For data mining: Pokémon XY, even if just for number checking (we don't even have a stat topic, so...).