Jimmy/Kaito Kid- Rain. Dr. Agasa- Pat Morita if he were still alive. Richard- I don't know why, but J.K. Simmons. Inspector Meguire- Bob Hoskins. Sereena- Brenda Song. She can pull off the annoying spoiled rich girl well.
These are the only ones I can think off.
Rodimus Prime: The George W. Bush of Autobot Leaders
Good choices for Richard and Serena. As for the others:
Jimmy Kudo- Cole Sprouse Kaito Kuroba- Dylan Sprouse Rachel Moore- Olivia Olsen Gin- Zachary Quinto Vodka- Dwayne Johnson Shiho Miyano- Allison Mack Harley Hartwell- Zac Efron Kirsten Thomas- Michelle Trachtenberg Eva Kadan- Lisa Edelstein Dr. Agasa- Bernie Kopell
The problem with making a Case Closed movie would be that eventually, the actors will have to grow up. If it was a film series, you'd have to cut it off after two or three films so whoever's playing Conan and Vi/Anita wouldn't get too old for their role.
I'm currently watching the 2nd live actions drama, and I'd say Allison Scagliotti for Ai, the girl they have playing her in the 2nd live action movie reminds me a lot of her...