Forgetting for a moment that a "live-action" OotS is a stupid idea since a lot of the charm is in the art, who to cast?
Off the top of my head, I've picked:
Idris Elba as
Roy
Jessica Chastain as
Haley
Owen Wilson as
Elan
Tilda Swinton as
Vaarsuvius
Brian Blessed as
Durkon
And the hardest for me to "cast" Tom Cruise as
Belkar
What are your picks?