Conquest of the Horde

So what I want to do is to Role-play a ghost that would be unable to be seen in normal conditions. But not only that: this ghost would be able to enter dead bodies and animate them to it's will.

Now I will consider it can be only Forsaken, due to no other race actually allowing zombies to walk through their cities (maybe except some Horde ones)

I don't even think that, if approved as a custom model, would be allowed to enter dead bodies.

Ugh, why not ? :[

I'unno, it could clash if someone was dead and you wanted to use their body and so but I don't know. Plus, the only lore of some dead person using a body is Sylvanas using her own.

Wait, what? Sylvanas, as a Banshee which she was, now possesses her own body ?
I just thought that they changed her model and gave her abilities in TFT...

Attempts to roleplay ghosts have been denied in the past.

What can I say? Great way to shut one's mouth.