Kristen Bell is just about getting to the perfect age to play Murphy. Oh damn, now I'll never picture anyone other than Kristen Bell as Murphy. This could do some serious damage to my future reading that results in endless giggle fits.
And just because I'm in a Buffy mood...
I think Alexis Denisof, using his "faint British accent", could be a really creepy Nicodemus:
And if not Nic, maybe Kincaid. Or somebody. Because Alexis Denisof is awesome.
Anthony Stewart Head would make an awesome, well, anybody really, but I think he'd be quite good for Vadderung or Langtry.