Kyogre (PKMN) vs Diekbeck (AtLs) - Diekbeck can waste a lot of time with his whoring. But I don't really think he can eke past the combo of Calm Mind+Rest spamming - even assuming Rob Mind works, it's going to -utterly fail at life- against Kyogre MDef, particularly once it gets buffed, and Diek is going to put up Invincible stat unless he wants to get blown up by Waterspout. Equipping an elemental magic circuit for hitting the lightning weakness is going to both smack his stats into the gutter and accomplish nothing about Kyogre getting his buffing up. At that point, he's just running himself out after ten million years and a Hydro Pump makes him explode. And I don't think I see Rob Mind really hitting Pokémon attack charges, but this can be argued until the end of the world.
Ryu (BoF2) vs Royce (Lunar:SSSC) - No lol ohko for Ryu. Birdie, however...
Genevieve (VP1) vs Mewtwo (PKMN) - His preferred type of fight.
Miguel (CC) vs False Althena (Lunar:EBC) - Outslugs... I think.
Kanon (WA2) vs Kevin (SD3) - Boss Kanon is pretty well-suited for this fight. Her vs. Tosh should be more interesting.
Mirage Koas (SO3) vs Tosh (AtLC) - ahahahahaha mirage in heavy
Cloud Strife (FF7) vs Gau (FF6) - Gaus it up.
Alys Brangwin (PS4) vs Wakka (FFX) - Wakka is 101% average speed on his first turn. No matter how you scale Alys as a temp unless you do something really funky, she's bound to be faster than him and hit the match-winning button first - she manages to remain close to Rika at speed consistently throughout the game.
Lyon (FE8) vs Natalia Luzu Kimlasca-Lanvaldear (TotA) - Natalia is very ill-suited to avoid the 2HKO. She needs to cast the expensive full-healing spell to hold up to Lyon's damage, and she eats a counter and explodes if she goes on the offense.
Margarete Zelle (SH1) vs Lance (Brig) - God. Margarete goes first, though, and if I see her ID hitting turn three on average, she has the fight. I have no idea how much resistance Lance has to status, though, and I sorta feel tempted to kneejerk against him here, since it'd take pretty badass resistance to get him to outrace the effective 3HKO.
Mara/Manya (DQ4) vs Robo (CT) - EDIT: Sure thing, saving me from thinking. I know random variance exists, but blargh.
Black Wizard (FF1) vs Solt (CC) - Just say no.
Tim Rhymeless (WA2) vs Llewelyn (VP1) - Llew is just so bad.
Chiepoo (S4) vs Gwyn (Lunar:EBC) - ... jesus christ this fails.