If you're wanting a lore-accurate job, then I should point out that the raen don't really fight. Most of them live in hidden, hard to access settlements. The only notable raen I can think of who does fight is a ninja.

However, Au Ra in general do fit many jobs. Your dark knight job trainer for higher levels is an Au Ra, and there are major story characters who are warriors, black mages, and bards, and we see minor characters fighting with swords and with katanas.