Well I didn't know who you meant, I've remained blisfully unaware of her, but now I can see the similarities between the two. Meh.
I was thinking, there are some particular types of bad guys in LotR (and lots of them), and for fun I've had a go at some categories, feel free to move things around:
Simple Bad Guys (we don't see their potential for good)
Morgoth
Sauron
Witch King
The Ones Who Stray From the Path (in varying degrees)
Saruman
Denethor
Grima
Boromir
Dead Men of Dunharrow (I know, they come good)
The Exploited (used by the powers that be)
Gollum
Ungoliant
Orcs (bit controversial this one
)
Dunlendings
Natural Terrors (unpredicatable, linked to nature)
Old Man Willow
Shelob
Barrow Wights
Have some fun arguing with that lot.