For Cathedral vs. Vitali: No SN, but seeing all the Vitali votes... Usual reminder that the way to cheese Cathedral's ID is via party-switching, and that is an option that explicitly doesn't exist in the DL (unless you're Tal?!). I'm still fine with holistic disrespect, of course, and even endorse it, but that applies to a LOT of boss moves - Cathedral's ID is still better in-game than, say, Cloud of Darkness's Bad Breath, where you are basically guaranteed to have 4 Ribbons and for it to do absolutely nothing rather than even force a switch, and most people let CoD spam BB, for example. (Or how 4D Pocket is powerful in-game and good, but not instant win-the-fight.)
Okay, so fine, no ID interp. Even if Cathedral is bad at slugging down Vitali, everyone seems to be going with Snow's antihyping of Poizn. Remember that if you inflict the same L-status effect twice, it goes to an H level effect (at a percentage rate? I forget, but if so, the "upgrade" rate was good I want to say, like 60%+.) H-Poison is BRUTAL. It is 25% HP loss per turn and shouldn't be affected by match-ups or anything. So even if POIZN is literally Cathedral's only damage source, he merely has to stick H-Poison and then win in 4 turns, maybe less. This means that Vitali needs to at least 8HKO the insanely tanky Cathedral, and possibly more like 7HKO or 6HKO if there are speed issues. Since Snow seemed to hype the relevance of Cathedral's claimed 30+HKO, that seems unlikely.
For turtle-summon: If Vanille is seen as getting away with this, then she probably just OHKOs a scaled Lenus. She doesn't screw around with doing damage with the summon out, she just goes straight for the ult, which should be considerably more than an attack chain.
Shania (Shadow Hearts: From the New World) vs Ashera (Fire Emblem: Radiant Dawn)
I'll buy the hype, sure.
Heavy
Lenus (Legend of Dragoon) vs Oerba dia Vanille (Final Fantasy XIII)
I'll be honest: This is a pretty holistic vote myself. I think the turtle-summon strategy DOES take it on a stricter view, but I'm pretty happy to take any excuse to vote against it, and lots of actual FF13 bosses have time-based AI that can screw over such a turtley strategy (see Elf's Bart 2 notes), so I'm willing to squint a bit and assume that Lenus-the-FF13-boss would have "changes AI if Staggered or if 3 minutes pass" as the equivalent to "changes AI if someone dragoon transforms." It's not THAT different from figuring out what's a transform anyway in the DL.
Cait Sith (Final Fantasy VII) vs Nel Zelpher (Star Ocean: Till the End of Time)
Freeze. (I believe FF7 Freeze inflicted Stop, and checking, FF7 apparently doesn't block that.) Also I thought Ice Needles was turn 1? Cetainly if you use comboy averages where Nel gets to do the move repeatedly.
Vyse (Skies of Arcadia) vs Hiro (Lunar: Eternal Blue)
That physical spoiling.
Middle
Natalia Luzu Kimlasca-Lanvaldear (Tales of the Abyss) vs Zegai (Suikoden V)
Stocke (Radiant Historia) vs Raine Sage (Tales of Symphonia)
Historica Power Waves.
Dekar (Lufia II: Rise of the Sinistrals) vs Guy (Fire Emblem: The Blazing Sword)
Light
Viki (Suikoden Series) vs Nanami (Suikoden II)
What exactly is Nanami's damage? I can't tell from the stat topic, which doens't seem to list a physical damage for Nanami. Maybe I'm just blind.
EDIT: Sure, faster 3HKO wins this.