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In the very beginning Crowley appears as a snake, but he uses his "favorite shape" for the majority of the book, described thus: "Crowley had dark hair and good cheekbones and he was wearing snakeskin shoes, or at least presumably he was wearing shoes, and he could do really weird things with his tongue. And, whenever he forgot himself, he had a tendency to hiss. He also didn't blink much."
He always wears sunglasses, with good reason; his eyes are yellow, "with slitted vertical pupils". Like [[Aziraphale]], his "true shape" has wings, which are usually held in.
The book states, "Contrary to popular belief, the wings of demons are the same as the wings of angels, although they're often better groomed." Nevertheless, Crowley has been drawn with stereotypical bat wings (as well as horns and a tail) in official art. Other interpretations sometimes give him angel-style white feathered wings, as the book states that, due to the fact that they are both of "angel stock," there is no apparent difference between the wings of angels and demons.
He owns a stylish flat, although he doesn't really 'live' there in any sense. He does, however, pay attention to the houseplants, which are glorious and lush - largely because he terrifies them into keeping up their size, or else. Crowley owns the original sketch of the Mona Lisa, which apparently Leonardo infinitely preferred to the painting, claiming he could never quite get the smile right. He also inspired Leonardo to design helicopters.
For the most part, Crowley appears to be simply a laid-back, rather tragically cool young man, but he is prone to serious philosophizing over the nature of the Universe. His friendship with [[Magda von Waldemann]] began largely based on their shared unhappiness with their lot in life- or unlife, as the case may be.