Oh I was waiting for this one!
As I said for all the other races, NO CLASS LOCK, all races should be able to be all classes.
I'm gonna focus on giving all the understandable reasons I can to explain why "UNDEAD" can be Druids and Paladins in the next posts.
IF NOT POSSIBLE and you still decide to go full STEREOTYPE, then all classes except Priests, Paladins and Druids. If they can't be Paladins they shouldn't be Priests also.
Feel free to disagree after reading my explanations.