If you don't know who most of the characters in this comic are, don't feel bad. Most of them are obscure; hardly as iconic as Erik or Jareth. (I know I said Dracula was just there for the Pre-Halloween joke, but he's easy to draw, so he's cameo-ing again.) The important thing is this: Gerard Butler, Jack Davenport, and Philip Quast get around. And while Butler is probably the most well known of the three, they're all very capable and diverse actors.
"Copies" in order of appearance, by actor:
Butler: Dracula (Dracula 2000), Andre Marek (Timeline), Leonidas (300)
Davenport: Steve (Coupling, Michael Colefield (Ultraviolet)
Quast: Pearse Harman (Ultraviolet), George Seurat (Sunday in the Park with George)
Erik belongs to Leroux and Webber.
Jareth belongs to Henson, Lucas, and Bowie.
Norrington belongs to Disney and Bruckheimer
Javert belongs to Hugo, Boublil, Schonberg, and Kretzmer.
Dracula belongs to Stoker and Craven.
Andre Marek belongs to Crichton.
Leonidas belongs to Miller and Varley.
Steve belongs to Moffat.
Michael Colefield and Pearse Harman belong to Ahearne.
George Seurat belongs to himself and Sondheim.