New setup as of right now:

Sabin - Genji/Master. Hits 8 times for 7000-9000+ (on normal monsters).

Shadow - Speed is at 98. Has a Genji Glove and Miracle Shoes equipped and attacks twice as fast as every other character. So he basically attacks 4 times in one round, technically.

Locke - Speed is at 115. Miracle Shoes and Thief Relic. He uses Excalibur and Paladin shield. He (technically) attacks twice per round, like Shadow.

Mog - Zephyr Cape and White Cape. Magic is at 120. Wind and Earth Dances are what I use to attack with. If its one monster I use Earth. If theres multiple targets, I use Wind. His Sun Bath heals my entire party 7500-8500 each. His Wind attack hits most monsters for 9999. The ones that have resists it hits for 5000-8000. All the Earth attacks hit for 9999 no matter what it is (even the Brachosaur in the Tyranno forest, which he soloed at lvl 81 and again multiple times).

Celes - Genji Glove with 2 Ragnoroks. Boosted her strength to 60 (before I knew about the Ragnoroks abilities) and her magic is at 130. Hits twice for 9999 and both attacks have a chance to cast Flare for an additional 9999 each.

Those are my main 5 so far. Basically, 1 round against anything is all I need...as usual.