[@Cu Chulainn] A lot of the different classes in Fire Emblem are basically the same. I didn't sort them out to keep the ones that didn't repeat because, in the end, it falls down to how you want your character to look and feel I think. 

To answer I'd say...Yes, probably. 
In that case. If you want to play a Ninja, it's not [i]exactly[/i] like a Thief or Assassin, so it can be adapted I guess. Same thing for a Oni Warrior. It's basically a fighter or a Barbarian...just with a eastern look.