NCIS Spin-Off News: Roles Announced!

According to Michael Ausiello of Entertainment Weekly, the much-anticipated spin-off of NCIS will begin shooting its pilot in February.A

Here's a look at two of the proposed series' main characters:

• Callen: A average Joe in his 30s... or so he'd have you believe. In reality, he's a human Transformer who can change change personas as easily as most people change clothes.
• Clara Macy: Former MP in her early 40s whose tender side shows in the way she plays mother hen to her colleagues.

Ausiello has a list of more characters on the show. But you tell us:

What actors/actresses should portray the roles detailed above?