He looked pretty human or as human as people can look in a cave full of necromancers.
Necromancers, in fact most mages, seem to have a chance of a random ingredient in their inventories. Occasionally I've seen human hearts and human skin too, but usually it's a more normal ingredient.
Anyway, as far as Daedra go, I've only met one so far. But it was a big one. Happily he had the same voice actor he did in Shivering Isles!