Basically none of the people in the actual trailer. I can sorta see Roberts as Marcone, but Elba as Morgan makes almost no sense to me at all.

Honestly, I never really did put any celebrity faces to characters, I always constructed my own view of what the characters looked like based on how they are described in the books. The RPG images are pretty decent in that regard, as you see here.

If I had to pick, I'd probably have James Franco as Thomas, maybe Chris Hemsworth as Michael Carpenter or Kincaid, Robert Patrick as Parker, etc. Harry is really hard to place, maybe a Billy Burke early series & Jeremy Irons (when he still looked like this) late series, but neither quite fit. Maybe you could get Megan Fox to play Lara (if she wasn't such an airhead actress), or perhaps Taylor Cole instead, & maybe you could get Vanessa Ray, Elsa Pataky, or Lele Pons to play Murphy. Christopher Lee would be a great Merlin if he was still alive. And finally, dare I say it, Mary Elizabeth Winstead as Molly.

Dude you got some really good ones in there. For me Morgan was always Idris in my head because his role of Heimdall in Thor seemed to sync really well with Morgan. Plus I’m a huge fan of the audiobooks for the Dresden Files so the voice James Marsters uses for Morgan fits Idris really well. James Marsters absolutely slays (pun intended) in giving the books life. Maybe that’s why I have such a hard time picturing someone as Dresden. It’d be cool to have him come in a play a role if a big production movie were ever made, when he was younger he maybe coulda pulled off Thomas - now maybe John Marcone?

Keanu Reeves as Harry all the way

Please god no

Clancy Brown for Morgan! I keep trying to convince myself that Joel McHale can play late 20s, if I ever win that argument he becomes Harry hands down. As for celebrities, I really want Nic Cage as Hades. I've put a lot of time into casting the books lol

Top of my head the only actor I can think of who is tall enough to fit Dresden (and dark-haired, as Dresden is supposed to be) is Jared Padalecki...

I disagree Zuzu. They should all be non famous (fresh faces) If the screenplay is done right they will be the names and faces tied to the Dresdenverse. Jared will always be a Winchester (Supernatural) it's hard to imagine him as anything else. In my minds eye I can't see any well known actors playing those parts. I'm picky that way. Even though I liked the TV show the actors they hired didn't do the characters justice. Paul Blackthorne was too old to play Harry. The actress that played Karen wasn't a good fit either. I wish they would try to find actors that fit these parts closer to Jim's description of them. However, it's always hard to recreate one's imagination in real life.