Fresh classes.

[Enkidoh]

Keeping away from Jobs and just focusing on classes for now, some ideas I've come up with:

Ronin (role: tank. Weapon: Ronin's arms and Ronin's two-handed arms (ala, katana and great katana) - legendary warriors from the Far East, driven westwards to Eorzea by Garlean purges, they employ quick attacks and martial arts to strike their target's weak spots. Masters to no one save themselves, the lone-wolf nature of the class is right at home as an adventurer class.
Job upgrades: Ninja (DD/debuff hybrid) and Samurai (tank/DD/healer hybrid)
Acrobat (role: healer. Weapon: Acrobat's arms and Acrobat's two-handed arm (ala: chakram and 'silks') - street entertainers that delight audiences with their dexterous moves and extraordinary fluidity, these mummers have crossed into the arts of war by fusing their traditions into a unique form of fighting to befuddle their opponents while granting succor to their allies. Job upgrades: Dancer (healer)
Mystic (role: healer. Weapon: Mystic's arms and light shields (ala: fencing swords and rapiers) - a discipline long thought lost due to the collapse of Sharalyan, these legendary swordsmen and women found ways to enchant their blades with aetheric energies, infusing their attacks with added power while granting them warding effects to protect them and their allies from harm. They are also well versed in arcane healing magics unheard of in Eorzea. Job upgrades: Rune Fencer (DD) and Red Mage (healer).

That's a few I've come up with so far. Feel free to criticize my ideas.