OK this is my first fan fic cast so bare with me. I think Milo Ventimiglia from Heroes could pull off this character very well, Moon Knight is a very deep character and a little twisted. Milo has the acting skills and I believe he could be one of the dedicated actors to make this character come alive.
And for the villain,I wasn't really sure, but I think The Taskmaster would be an awesome fight to see.This actor could definitely pull off the fight scenes as well. So I chose Jason Statham as Taskmaster