Mr Darbido

in s2ep4 when aziraphale is looking for a magic trick to do, he first says that he can't go to the magic shop because he's not a professional conjuror. crowley disagrees, convincing him that he's a professional as he is "about to perform on the West End Stage"

afterwards when the shopkeeper calls aziraphale a "talented amateur", it's aziraphale himself who makes a point in proving that he's no such thing as he's "booked to appear in the West End"

and then when they're backstage talking to furfur aziraphale clearly calls himself a "working professional magician". over a few hours, crowley makes aziraphale confident in his own identity

ah, poor demon he is not responsible for his actions