True enough. Actually, Martin's not my first choice. I'd like Sam West, or a couple of years ago I was kind of enamored of Kenneth Branagh for the role. But I think Aziraphale does try to present an appearance that's overtly ordinary. I don't think he wants to stand out in a crowd at all if he can help it. Of course, under the surface he's not ordinary, and probably not as good at hiding that as he thinks he is...

I think that, uglied up some, BC could make a dynamic, sexy, and terrifying Hastur.