[Bob Gray]

Uh... Pennywise anybody? Cthuhlu? LOL.

Some of my favorite villains/monsters/baddies:
Cthulhu- H.P. Lovecraft
Pennywise the Dancing Clown a.k.a Bob Gray- IT by Stephen King
The Overlook Hotel- The Shining by Stephen King
George Stark- The Dark Half by Stephen King
Randall Flagg- The Stand by Stephen King
Raymond Andrew Joubert a.k.a. The Space Cowboy- Gerald's Game by Stephen King
The Crimson King- Insomnia & The Dark Tower by Stephen King
Tak- Desperation by Stephen King
Barlow- Salem's Lot by Stephen King
God of the Razor- The Nightrunners by Joe R. Lansdale
Decker- Cabal by Clive Barker
Mr. Dark- Something Wicked This Way Comes by Ray Bradbury
Gideon Winter a.k.a The Dragon- Floating Dragon by Peter Straub
Spenser Mallon- A Dark Matter by Peter Straub
Ob- The Rising & City of the Dead by Brian Keene
Mr. Rosebottom- The Ceremonies by T.E.D. Klein
Mogollon Monster- The Return by Bentley Little
M. Das- Song of Kali by Dan Simmons
Rudy Pasko- The Light At the End by John Skipp & Craig Spector
The Scream- The Scream by John Skipp & Craig Spector

As I'm reading Under the Dome, I have to add Big Jim Rennie to the list.