As we discussed in Discord I think all races should be able to be all classes.
BUT IF NOT
Then everything but Paladins and Priests, and maybe, just maybe not Druids.
I'm not sure about Druids because I would like to see an ORC DRUID, nature is dangerous, Orcs still have that primal sense of measuring strength through fights, and Orcs have learned to survive dangerous places.
If you want sell a DLC that allow us to play all classes with all races, but I would really like to play any class with any race, TAKE ALL MY MONEY,