I've seen some people suggest Dark Knights, which is something I also wouldn't mind seeing, but the one thing I would love to see is Judges.
I realize right now we are fighting the "Empire" and those judges in armor just screw "Judge!" when I see them in screenshots and so on. I have always wanted to play a Judge since they were in FF12 and such, but neither FF11 and so far FF14 has introduced them as a playable class.
Having classes to me that people recognize are good and all, but having some new classes would also be actually rather nice. However the question would be, what combination of jobs would you do to unlock the Judge class?
Maybe Judge could be a class of a higher tier, where you need to unlike say like Paladin, then also raise up Warrior?
So here is some combination ideas:
Marauder & Gladiator
Marauder & Thaumaturge
Gladiator & Thaumaturge
For Higher Tier type of thing:
Paladin & Thaumaturge
Warrior & Thaumaturge
Paladin & Warrior
As weapon of choices, maybe they can be one of the few classes that can operate different types of weapons. Such as swords and lances. If it is swords, perhaps they can dual wield, or carry one massive two handed sword.
They type of combat would be primary Damage Dealing and Afflicting Status Debuffs on their targets, and sometimes also tanking when needing too.
Most of their attacks will have debuffing abilities and stuns, so they can keep their target from outputting a great deal of damage, maybe even a TP attack interruption.
This is an idea and I hope others may like this or have some suggestions to add to this!