He-Who-Must-Not-Be-Named! Voldermort himself.
And I third Umbridge-what a c*nt (hate that word, so won’t say it). Nasty bit of goods, that one.
He’s dead - his head was delivered to Dorne, and a head that size is hard to fake.
Now, as to what Qyburn (another one who needs killing, BTW) is doing with his body, that’s another story. I can see him coming up with some Frakenstein’s-monster type affair, sure, and I suppose that that’s also a way of coming back to life, but really - that’s no more “living” than what you’d call those wights beyond the Wall. It certainly isn’t the continual existance of the original donor, so to speak.
George Hearst in Deadwood. I guess I’ll just have to content myself with knowing that he is in fact now dead, though no one in Deadwood got the satisfaction of giving it to him.
Er, hum, what? I don’t recall Umbridge being killed (not that I wouldn’t cheer). And obviously Voldy is still around.
ASOIAF and no Walder Frey? That’s going to be some sweet sweet reading.
Yes, they are awful, but Mrs. Dursley managed to stand up to her husband when Dumbledore reminded her of her “promise,” and they seem to be made fools of just before Harry goes to school, so I can live with them. I know they’re going to get it, somehow.
Umbridge, however, was in a position of power and loved tormenting Harry and everyone else. For some reason, although I find Snape unpleasant, I don’t want him dead. Yes, he’s biased, but he is a good teacher and for some reason, Dumbledore trusted him. He also tried to save Harry during the Quidditch game in the first book. Umbridge, however, has absolutely no redeeming qualities.
She wasn’t killed, but wasn’t she sent into catatonic shock by the centaurs?
The marauding Union sergeant from Gone With the Wind.
I can’t believe we’ve gotten this far without someone mentioning Hans Gruber in “Die Hard”.
That’s because Alan Rickman has more charisma in his little finger than Bruce Willis has in his whole sweaty, disgusting body. 
Yippie Ky Yeah.
Have to totally disagree. The Joker is not only totally without empathy but needs to be killed. He’s outlived his usefulness.
You have got to be kidding. I was cheering for him all the way through the movie.
The sheriff he played in Unforgiven made Herod look good in comparison.
Naw, he was quite a nuanced character: he was a nasty brutal bastard, but he needed to be to keep the likes of scum like English Bob out of his town. He was probably a bad man, but he was aware of his badness and why he needed to be bad: he wasn’t wholly unsympathetic. Besides, he was building a house - it was a leaky, ill-wrought house, but he was trying, in his own shoddy way, to create something of lasting worth: it was a metaphor, you see. Hats off to Gene Hackman.
John Herod also gets a pass for gunning down that cocky little shit Leonardo DiCaprio.
these are villians who need to BE killed, not ones that were killed.
And some of the Deatheaters, as well. And Uncle Olaf, from Lemony Snicket.
I do read adult fiction, I swear.
From The Curse of Chalion, Lord Dondo. The disgusting fellow who arranged for a forced marriage to Iselle, and gloated to her face about how he was going to rape and impregnate her. Soul taken by death magic, and ( eventually ) dragged off to the Bastard’s hell ( most likely ).
Lord Ryoval from the Vorkosigan books. A torturer and psychological sadist, killed by Mark, who took the time to gloat to Ryoval’s face while he choked to death. “I am too a Vorkosigan, the one trained as a deep cover mole and assassin. I really hate it when people underestimate me, y’know ?”
Count Olaf, actually. And if you click on “More Views” it looks like you might be getting your wish.
Venandakatra the Vile, aka The Vile One from the Belisarius series. Name a moral or character flaw, he probably has it. Megalomanical, beats and rapes children, loves torture, big fan of mass impalings, treacherous, greedy, short sighted, bad tempered; he has them all. He’s sufficiently unpleasant that he’s called “vile” by his enemies, allies, and even total strangers who just met him.
Meets his satisfyingly gruesome death ( “you always did favor a short stake” ) at the hands of Raghunath Rao, India’s greatest assassin and really P.O.'d husband of the Empress of Andhra.
From The Prince of Tides
Callanwolde and the other two escaped convicts who rape Tom, Savannah, and Lilah. The only thing to be regretted about their executions is that it cost Caesar his life.
Also, Achilles really earned that arrow in his ankle.
And if we’re going to talk comic book characters (somebody mentioned The Joker upthread) I’ll have to go with Darkseid. I hate to admit it, but when I saw the JLU in which Batman tried to stop Superman from offing the Lord of Apokalips, my first thought was “What the hell is wrong with you? If ANYBODY is worth dying to off, this is the guy.”