Right, a few points on this one.

Zombies and ghouls are fine.

I presume by warriors you mean skeletons with spears, and normal ones with swords/axes/whatever. Also good. I’d advise you include archers as well. Although they aren’t in the main army list, they are included in the army book, as a specific blood dragon army unit. I’m sure, for sake of balance and variation if nothing else, you could include them. They would have to be rubbish though. I mean, really poor quality troops, barely able to hit at ten foot, let alone normal shooting range.

Wrights and Grave Guard… well Grave Guard are wrights. They’re simply one type of unit of them. You could also split Grave Guard into two types if you wish; sword and shield (basic), or a halberd (elite?), as they use both. Black Knights, the other non-character variety of wright, are obviously the heavy cavalry here. Only the one type of them possible I think, though there are slight grounds in which you could split them into 'heavy cavalry' and 'very heavy cavalry' branches.

For ethereal units… not sure how you could do them. Very high defence could work, I guess, but it doesn’t really do them justice. Either way, is there a method of creating morale damage from a unit’s presence? I think there was in RTW, but not sure about this one. Either way, they should, as in the TT version they cause terror.

My Blood Dragons, do you mean the type of vampire? Surely units of vampires, considering even a weak vampire is a powerful hero, are a bit much? If this isn’t what you mean, please explain, because I’m not on the right page.