Since I realise I haven't posted a comprehensive castlist, I'll post the actors I have decided on. All images are spoilertagged.
Harry: Many have been mentioned. Blackthorne is a strong contender, and while Fillion could definitely pull off the attitude, he just doesn't *look* like Harry. As of yet, I've not found an actor I'm completely stisfied with for Dresden.
EDIT: Just thought of an actor who, while not exactly how I picture Harry, is a lot closer than any of the others: Enver Gjokaj. He's close physically, and, while I haven't seen him in a role that really resembles Harry, I have no doubt he could act the hell out of the part. He's an
amazing actor. In Dollhouse, he plays twelve different characters.
Twelve (technically one, with repeated mind-and-memory wipes/swaps).
Perfectly. Including a
woman. If anyone has acting chops, it's him.
Murphy: Sarah Michelle Gellar. I mean, COME ON.
Marcone: As with Harry, I've not come across an actor who just jumped out and said 'I'M MARCONE', but Marsters could certainly do it. (I prefer him as the voice of Bob, though)
Molly: Leven Rambin (she was Glimmer in The Hunger Games and an angel in Wizards of Waverly place, but I came across her Terminator: the Sarah Connor Chronicles). Molly C Quinn has been suggested, but she's just not how I picture Molly.
Thomas: There have been a lot of good ones, but, depending on his American accent, I'd contend Richard Armitage (BBC's Robin Hood, Spooks, The Hobbit) would be an AMAZING Thomas (or, failing that, a good Lord Raith). He's
good at darkness.
Susan: A lot have been mentioned. For me though, Valerie Cruz all the way (it was the DF part she auditioned for, and she's read the books!).
Failing that, Eliza Dushku could definitely do it:
Morgan: As has been said, Liam Neeson.
Michael: Again, I haven't found an actor that just clicks for Michael, but Alexis Denisoff would be good. (not the best picture, but I couldn't find many)
Charity: Miranda Otto. I realised when rereading PG that she was EXACTLY how I pictured Charity. And we know she can do the action, becouse, hey, EOWYN. (She's smiling more than Charity in the pictures)
Butters: David Krumholtz. He's just so... Butters. Go watch his part in
Serenity and tell me that's not Butters.
Speaking of
Serenity,
Luccio 2.0: Summer Glau. Action, crazy (necessary for Corpsetaker), tearjerking and looks in one neat package. Alternatively, she could do Murphy, with blonde hair.
Lara Raith: Eva Green. Another Case where, when it was suggested, I realised the actress was how I pictured the character.
Lea: Christina Hendricks (Mad Men). Yet another instance when the actress was exactly as I pictured the character.
Lash/Lasciel: (Because they should really have the same actress) Amy Acker. Mentioned before, and doesn't fit the description, but my god can that woman act. Go watch Dollhouse s1 e11. Seriously. If not Lash, then I could see her as either of the Faerie Ladies.
Alternatively, Dichen Lachman would make a really good Lash.
Nicodemus: Benedict Cumberbatch. He looks roughly like the description in DM, and he's got Nic's ice-coldness down pat. Put a grey streak in his hair, and he's Nic.
Bianca: It was said in another thread, I think, but Morena Baccarin.
Lloyd Slate: Sean Maher, purely for the Nerd reaction: hey, it's Simon Tam, that's coo-WAIT WHAT'S HE DOING!? ( I reckon he could pull Thomas off, too).
That's all I got for now. I'll post more when they come to me.