Monk Ramza, as mentioned, is probably the fastest path to being OP. Once you get him dual wield and are done Brave boosting, there is literally no reason to be anything else, although you could easily work him up as a part time Math magic guy too for utility. Dual Weild with sword Razma cannot even come close to the damage output, HP, and movement the monk class provides. Late game, having him and Reis set up as monks will destroy the entire game no matter what the rest of your party happens to be, especially if you poach farm more barrets. Then you have Orlandu and Agrias holy swording if that is not cheesy enough.
If you want to be really grindy, go math mage and put absorb holy items on the entire party and just ignore any attempt at engaging in tactical combat by spamming Holy on as much shit as you can. The holy absorb items start becoming available for sale in chapter two, but you can grind up match magic before you even enter Rat Cellar if you really want to autismo that shit and wreck the game right out of the gate. Aside from Dual Fisting Monks, nothing puts out more damage than a Black Mage with pumped MA spamming Holy, and Math Magic lets you do it for free and faster.
