I love all the acting choices David and Micheal made for their characters but one I’m especially obsessed with (and frankly I don’t see it being talked about enough) is the body language/posture.
David took one look at Crowley and decided this boy is Bouncy™. He has cooked spaghetti for bones. Ninety percent of his walking is done by his shoulders actually. He might be man-shaped but he’s actually a liquid constantly changing form to fully fill the container (chair) he’s in.
Meanwhile Michael went - We’ll he’s an angel, of course he’s prim and proper and carefully put-together. He has the posture and grace of a classically trained dancer. There is also One Million Bees under his skin at any given moment.
And they were so right.
And on top of this, how their bodies react to each other - Aziraphale becomes silly and free, letting go of the forced-stiffness he’s had to impose upon himself to survive Heaven all these years.
And Crowley became more still, more calm, less reactive/jumpy, because being around the angel (especially in the bookshop) is the only place he feels he can truly relax.
