While I know many are turned off by the idea of Limited Jobs, I think a Mimic/Morpher job that can turn into various NPCs, humanoid enemies, Primals and monsters has a lot of potential.

Imagine a job where you could heal as Lakshmi or Kan-E-Senna, tank as Forgiven Hypocrisy or Raubahan and dps as Zenos or a Diresaur (to dps) along with dozens of other forms each with their own role and abilities.