Also beat the 10-2 quest. Might as well post my set up from memory:
Auron: Riot Blade, Fire Armlet (X), Vossler's Gaunlets, R3 Fire Blossom, R4 Lifesiphon, Dragoon's Determination
Lifesiphon to build up gauge, Fireblossom for instant AoE, he uses Dragon Fang if Leblanc is still alive, Banishing Blade otherwise.
Tyro: Lightning Steel*, Edin's Coat, FF10 +20 Atk Accessory, R3 Blind Shell, R3 Banishing Strike, Mako's Might
It's Tyro; has Wall, can fill any niche needed outside of damage. Exists for Dispel and Blind here.
*...should have given him Rikku's claw on hindsight, since I think that's stronger, oh well
Terra: Maduin's Horn, Lulu's Hairpin, Terra's Pendant, R2 Meteor, R4 Ruinga, Devotion
AoE Nukes. Open with Meteor, continue with Ruinga, ignores Draw Attacks entirely, saves Magitek Missile for Ormi when he's solo for quick ST nukes
Rinoa: Lullaby Rod, Minerva Bustier, Silver Wing (or whatever the FF9 +30 Mag accessory is called), R3 Quake, R2 Bahamut, Ace Striker
Also exists for AoE nukes, with Bahamut being a quick 55k~ net damage over 2 turns. More to the point, she exists to use Angel Wing Quake and hit everyone with slow. On hindsight, probably should have given her Dr. Mog's Teachings but whatever. Winning run, she ended up dying from No Lost Love + Logos combo, but had already used Angel Wing Quake, so I just went with it, as she was already out of her good stuff, and had played her part.
Yuna: Wizard Rod (VII), Priest's Miter, some Mind accessory, Curaja, Protectga, Dr. Mog's Teachings
Healer; went with Protectga since the physical damage was clearly the bigger deal here, with 2 characters who have physicals, and one who has magic, and the one with magic spends a lot of time buffing and was the one who was going to die first to boot.
RW: Fenrir Overdrive. Nothing big came up, didn't care to reset, figured this would be good for Auron at least...and it was. In fact, Riot Blade seems to add Blind naturally (too lazy to look it up), so sometimes Whirlwind Slash would cover that!
Winning Run ended with only 2 medals lost on damage, meaning I could have in theory lost 2 characters and still mastered it. I had a scare moment when Ormi near the end did MT 3k to everyone, though no one died, and quickly got everything back together. Hymn of the Fayth > stuff.