In Neil Gaiman and Terry Pratchett’s original novel, the fast-living demon — originally the snake who tempted Eve in the Garden of Eden — has “dark hair” (in addition to snakeskin shoes and a pristine 1926 Bentley).
Revealing how the make-up and costume department originally conceived his Good Omens look, Tennant said: “It wasn’t in the book, but red seemed quite appealing as he’s from the flames. There’s also a part of me as an actor who likes to transform.”
In the present day, Crowley has a short hairstyle, but during flashbacks we see Crowley sport various haircuts, which Tennant admits was helpful during filming, both in terms of characterisation and figuring out the show’s time-jumping plot.
“Eventually we settled on a nice, short funky red cut. Then we see him moving through time with different lengths and styles. When I was reading through the script, just plotting through what happens when was quite tricky, and so it works as a marker.
“And I felt that Crowley would do that in a way that perhaps Aziraphale [played by Michael Sheen] wouldn’t as he’s more steady through the centuries. So that shows how a conversation about appearance sparks a few ideas that feed back into the character, and you end up dyeing your hair red for five months! Still, it meant I wasn’t wearing a wig every day, and all credit to Neil [Gaiman] who has lived with this but was still able to say, “Yeah, long red! That’s a great idea!””