Would like to see two new limited jobs.

Morpher: Based on the FFXI monstrosity system, it's build you own monster with form, abilities and traits. Could use Halatali as a monster arena for PVP and PVE fights.
Onion Knight: Is able to equip all gear, and all abilities, weaponskills, spells and traits from all your unlocked jobs. Build you own class and go nuts. Ofcourse it won't be balanced.