The one possessed with Gork should be Massive and really muscly, he should also have a big, spiky club and long sharp teeth.
The one possessed with Mork should look really 'kunnin' and it would be good if he was skulking about as if he was about to pounce.
"Playing Warhammer is just like making love. It's usually done on a table and afterwards you always feel great shame. Plus like most fun things the older you get the less fun it becomes. So remember, always wear a condom while playing Warhammer - I've got mine on now."