do not know much about cinema..
- I would say Jim Carrey form Hermann.. he played a magnificent role of Count Olaff in the Lemony Snicket's film, and could give some comedy touch to the villain.
- Tom Welling (Smallville) in the Role of Francis/Kerith ... only you would need to turn him blonde.
- and one of the Olsen Twins in the role of Rosemary ,
i don't see any TV girl to interpretate Nadja, perhaps a new Casting would make her 'appear'