Oh yeah, Au Ra with a greatsword would be fine I imagine, although specifically a Dark Knight...we don't know yet. Certainly, I'll have Kale being a DRK only for the weapon. For liteRPing dungeons though, the class seems too magical rather than just swinging a greatsword around (i.e. even though Kale is not a PLD, the PLD actions are generic enough in animation to be able to fit being a normal swordfighter).
I also bet you could play a Lominsan pistoleer or Garlond engineer as MCH as well.
I also bet you could play a Lominsan pistoleer or Garlond engineer as MCH as well.