There’s a subgenre of horror/fantasy films that revolve around the Devil, and there have been some pretty good/amusing characterizations of the cloven hooved fallen angel on film, here’s a list of my personal favorites.

1. Al Pacino in Devil’s Advocate.  (1997) A subtle, charming, somewhat grizzled Satan with the ideal job (for a really manipulative evil bastard that is): running a legal firm specializing in getting off the really guilty and skeezy.  He sings Sinatra and wants to breed the anti-Christ.  Best line:”Free will, it is a bitch”.
2. Tim Curry in Legend (1986). Really spectacular make up and sets creates a surprisingly hot 12 foot, red, rip-chested Prince of Darkness who wants to kill the last living unicorns so the sun will never rise again.  Best line: “We are all animals my lady”.
3.Linda Blair. The Exorcist. (1973).  I have a kid, and sometimes they do act like Satan and vomit an amount that seems to have been improbably contained inside their little bodies, but Damn, at least her head never spun around and she didn’t exit the stairs like an inside-out crab. I don’t remember if the main character here was said to be possessed by the Devil himself, or just a demon, but either way, creeeeeepy. Best line: I can’t bring myself to type it, but my brother does the FUNNIEST impression of it while making motions towards his crotch.
4. The Swirling Can of Satan in Prince of Darkness (1987).  Mix the cock-eyed Asian dude from Big Trouble in Little China, some silly metaphysics, a dude with a cheesy 80s mustache, and can of liquid Satan in the basement of an abandoned church and you get this movie. It’s silly, but oddly disturbing, especially the scenes of the future trying to contact the main protagonist in (apparently) what is the easiest method of time travel: an in-dream preview of life on Earth if they don’t put some Drain-O into Can O Liquid Satan in the here and now.
5. Harvey Stephens [AKA that creepy British kid in The Omen]. The Omen (1976).  Now, Damien (forever now in the vernacular as a synonym for “nasty little brat”) is technically not the Devil, he is the anti-Christ, which I thought I understood as being different from the Devil, so to make sure I Googled the term “Satan antichrist what is the difference”.  Let me tell you, you get some really fucking weird results with those terms together.