While its certainly been in several FF's, to my knowledge it has never been a playable class unless you count the dude that used to be one from FF12. I would love to see a judge class. Although, to be honest, besides murdering innocents by the busloads and wearing some sweet ass armor, I don't really know what skills they have. Still though! I am all for it.

I would also love to see the chemist from tactics become a class again if only to give a purpose behind all the potions we have in game right now that no one uses.

My apologies in advance to the Op for 2 ideas that are completely unoriginal.