Alan Rickman; Sheriff of Nottingham; Robin Hood, Prince of Thieves.
Easily Heath Ledger as The Joker in The Dark Knight.
He’s not even the best villian played by Rickman, which would be Hans Gruber from Die Hard 1.
Hannibal Lecter ranks high in villainy. But so well-read, a gourmet and with a witty remark even in tense situations.
“Love your suit.”
Favorite team: Auric Goldfinger and Oddjob.
Ming the Merciless from Flash Gordon.
“Pathetic Earthlings, who can save you now?”
Oh, yeah? Well, Christmas is canceled!
Spike from Buffy was the first to come to mind. Or maybe Cathy Ames from East of Eden, tho she was described as a monster rather than a villain.
Toss-up between Hannibal Lecter and Tommy Lee Royce (Happy Valley), although Game of Thrones had its share.
I’m surprised Darth Vader hasn’t been mentioned yet.
Wang the Perverted from Flesh Gordon.
“See how you like my Royal Flush, Earthling!”
Favorite trio: Kor, Koloth, and Kang.
Mrs. Umbridge is such a good one because she’s a villain that you probably know in real life.
Not much of a gourmet, really. If you’re going to have liver, you really want it to come from someone with a sedentary lifestyle, like a history teacher or patent clerk.
I was thinking a Mormon. Someone who has avoided alcohol and caffeine and drugs; ensuring it hasn’t been damaged through a party lifestyle.
Disclaimer: I do not in any way advocate the harming, murder, and cannibalism of members of the Church of Latter-Day Saints. Always abide by your local, state, and Federal laws regarding consumption of human flesh.
We have had this problem under study for many years and are pleased to announce it is relatively under control. 
Nazis.
My 40-year old daughter says hers is Freddy Krueger, followed by Pennywise from It.
Anton Chigurh.
Honorable Mention: Professor Fate.
Ba’al from Stargate SG-1.