Healer: Chemist(mixes ingredients to make more potent heals or DPS) or Necromancer(I seriously don't know, but I hope they're creative with sacrificing resources for heals)
Tank: Green Mage (Uses hammer and is good at support)
DPS: Rune Fencer(opposite of Red Mage play-style; mainly melee then switches to magic combo), Viking(uses two-handed axes)
Limited Job: Puppet Master(Garlean themed, uses Vanguards and Iron Giants as automatons, farms parts within garlean territories, main job is tank)