FF X mixed a lot of the classes together
Rikku is a thief/alchemist
Wakka is a mix between what is part of a green mage and gambler
Khimari a mix of Dragoon/Blue Mage

I liked the Mystic Knight and Oracle from FFV. Oracle is a new job from the GBA port. Giving attacks magic properties is cool, and affecting the future of the battle is a great idea that can be expanded on to a great system.