I'd like to see a rapier-wielding Red Mage as a DPS Job that has cross-class access to Fire 1&2, Blizzard 1&2, Cure 1&2, Thunder 1, Medica, and Esuna.

It would have a very limited MP pool, so while it does have access to strong spells like Cure 2 it cant use them too often and has to decide what spells its going to use its precious MP on.
It would have a Red Mage passive buff that granted MIND and INT equal to the amount of STR it had.

Beyond that, it would be a primarily melee Job with the typical melee play style plus a weaker 1-2-3 combo that replenished a very small amount of MP over time.

The idea is to have a melee class that has DRG-level dps while using all its MP to attack, and Bard-level dps when helping with extra heals/esunas.