When in need of an evil Egyptian god for fiction, while Set certainly has a worse reputation, most authors go for Anubis. It makes sense: the Jackal God is popular, got a super-cool look, and I can find tons of visual references.
And then, hey, he’s the God of Death, right?
I can quote a lot of resources in that sense, from Roger Zelazny to Johnny Quest by way of Young Sherlock Holmes, Bram Stoker and Valerie Leon.
Fact is, it doesn’t work that way. Anubis, aka Anpu, aka Inpu, sometimes also known as Hermanubis, is the protector of the souls of the dead. He’s not the bad guy, he’s with the good guys! Let that sink in, and then tell me again why fanatics with daggers should serve him.
And really, apart from the philological elements, Anubis as the dark god of Egypt’s been done to death. Which is, I realize, somewhat ironic.
So, when outlining AMARNA, I looked up a few other Usual (Egyptian) Suspects.
And for my money, you want a bad guy in Egyptian myth? Go for Apophis. The Stargate SG1 guys got the snake right.