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Kiriyama from Battle Royale has no qualms about letting a simple coin toss decide whether he'll play the game to win or try to fight it, killing multiple classmates of his in very painful ways and even seems impervious to a lot of pain that would cripple other people. He even cut his own arm open and taped a tendon differently so he'd regain usage of his index finger. It's revealed that his behavior likely came from a birth defect.
Kevin Khatchadourian, the eponymous character of We Need to Talk About Kevin. A teenage school shooter and torturer, he has been a monster ever since he was a young child. Kevin has a severe case of APD/sociopathy; his disorder results in him never relating to other people and finding everything to be dreary, pointless and uninteresting. Every day of his life. By the time he is a teenager, he exists in a constant state of And I Must Scream.
Discworld has Jonathan Teatime in Hogfather. According to the book, he "sees things differently from other people, in that he sees other people as things." He even spent a significant amount of his time theorizing how to kill the various holiday entities of the Disc, like the Hogfather, the Soul Cake Duck, and DEATH himself.
Lady Lillith has shades of this as well, what with being a high-caliber Tautological Templar. While not quite as Ax-Crazy as Teatime, she's likely done at least as much harm in the long run, most of it presumably more long-lasting. Never once does she stop to think if her idea of "good" has anything in common with other people's.
Roose Bolton. Capable of extreme cruelty and betrayal, while never wavering from his Dissonant Serenity. Although his lack of emotions and total detachment from other humans is actually more indicative of a psychotic/schizoid mental disorder.
Gregor Clegane. Case-in-point: he burned and scarred his little brother's face over a toy. A toy that he had thrown away. Murdered his little sister. Is strongly implied to have killed his father, and his two wives. Killed a baby and raped then killed the baby's mother and has raped, murdered, and tortured hundreds For the Evulz.
If you look closely, you'll realize the Sociopaths there needn't be on the Evils' side. Bronn, the sellsword who becomes Tyrion's champion and bodyguard seems to apply rather well. Stabs his dying comrade only because he felt it met social norms and expectations? Check. Volunteers to kill a knight, simply because he thinks it might be fun fighting one? Check. After a long time together suddenly betrays Tyrion for a noble title — granted, not without any warning, nor without giving Tyrion a chance to make a counter-offer to buy him back (he outlined that this was possible from the start)? Check! When it was pointed out that his wife has an older sister who will inherit before her (and thus, him), he just laughs and insinuates that his new sister-in-law might be having a Hunting Accident soon. The reason why he named his son after Tyrion was more likely because he respected the guy on an intellectual basis, not because he conceived of him being a friend, as such. In fact, once he points out that he has no friends at all and isn't the slightest bothered by it. He has a code, and there's a specific subtrope that applies to him entirely: Moral Sociopathy. However, "moral" may not mean what you'd expect...
Oh, Roose Bolton is certainly somewhere on the antisocial graph: he's just reallyhigh-functioning and maintaining a death-grip on hissocial mask. He's onto wife number three and we have no idea what, exactly, led to the deaths of the first two (his first hasn't even been named, yet)... He's that much unlike his son who indulges his impulses at the drop of a hat and doesn't seem to care who knows. He tips more to the sociopathic end of the scale than the psychotic, though. The only time he's been visibly disturbed has been when cracks start showing in those around him and things get heated between the Freys, Karstarks and the Manderlys during the siege. That's a direct threat to his personal safety, that is: no wonder he got outright angry and tried to order them to stop being stupid with not just a raised voice, but a knee-jerk reaction to get the dangerous and/or less dependable people out the place to freeze in snow drifts/ get killed by Stannis in what could be his most badly thought-out move, yet. It's been his only real display of emotion in the entire series — and, schizoid it was not.
Euron Greyjoy can function in society well-enough to be elected King of the Iron Islands via a Kingsmoot, but it's made abundantly clear that he is very, very deeply mentally disturbed from being implied to kill his brother to become king, to sexually molesting another of his brothers in his youth, to wanting to kill his niece, and sending off his third brother off to die in a Uriah Gambit and so much more.
Qyburn anyone? Seriously, the guy was stripped of his Maester's chain for performing inhumane experiments on the living to understand death and doesn't seem to understand why the Citadel did so. He uses his position to make special "requests" (Read: people) to work on. His method of interrogation is nothing short of cruel and unusual torture, made all the more disturbing by the casual manner he performs and speaks about such atrocities. He's also a necromancer with the appearance of "a little girl's favorite grandfather." Despite being the least physically imposing, he's possibly the most menacing of all.
Lord Voldemort is a textbook sociopath. In his younger days before he became Obviously Evil, he was a canny manipulator brimming with superficial charm. He does not understand love, viewing other people - including his own followers - as merely tools to serve his ends. Also, the "persistent killing" part fits him pretty well.Though the book posits a reason for his sociopathy. His mother seduced a Muggle with a love potion, and it was a completely loveless union. Riddle Sr. did not truly love Merope back, displaying affection only under the influence of the potion. This absence of love in Voldemort's conception was the reason for his complete inability to love. Dumbledore also believes that had his mother not lost the will to live and died in childbirth, but instead raised Voldemort and loved him, his sociopathic tendencies might have been avoided.
It is questionable whether Dolores Umbridge is also a sociopath (albeit to a slightly lesser extent), but since she completely lacks a conscience and only displays kindness to people to win them over so that she can use them for her cause, she probably is.
Bellatrix Lestrange and Barty Crouch Jr aren't far behind Voldemort. Both are unrepentant serial killers and torture tacticians, fanatical racists, mentally unhinged, both having murdered family members of their own (Bella killed her cousin Sirius, while Barty killed his father Barty Crouch Sr) utterly devoted to Voldemort who they seem to revere as a deity and may be their only true "attachment." Case in point, Bellatrix is married but does EVERYTHING she does for Voldemort, whom she is said to "love." Barty on the other hand, is not stated to have loved either of his parents, completely disregards the fact that his mother sacrificed herself to get him out of prison and immediately sought to rejoin Voldemort. Upon re-entering the services of Voldemort, he begins torturing, manipulating and killing again. It can even be construed that his tears during his trial were a farce in an attempt to manipulate his dad to not throw him in jail.
Though many of the supernatural creatures in The Dresden Files exhibit elements of sociopathy (notably vampires who fully embrace their predatory nature and many of the nastier Winter Court sidhe), the most obvious example is the all-too-human Nicodemus, a man so thoroughly and unapologetically (and yet often politely) evil that a Fallen Angel works with him as a genuine partner. In Skin Game he even refers to himself as a sociopath (correcting Dresden, who called him a psychopath). Nick's wife Tessa and daughter Deirdre are also candidates.
Henry Bowers in IT by Stephen King is a prime example of a sociopath, as he matures from a schoolyard bully to a murderer. Had he not been institutionalized, he likely would have ended up eventually going on a shooting spree.
In the same book, Patrick Hockstetter is explicitly described as a sociopath, with no grasp of the fact that others are, in fact, real, and at five years old killed his baby brother for disrupting household routine. IT even has trouble finding a humanoid form that Patrick will comprehend and become frightened of, briefly turning into a writhing, amorphous blob.
In the gruesome flashback scenes in the Inspector Lynley novel This Body of Death, one of the three boys shows most of the listed traits. As an adult and one of the murder suspects, he turns out to be innocent and eventually dies redeeming himself. Since the author has a degree in psychology, this may well be intentional.
Count Olaf of A Series of Unfortunate Events. He burns down a hospital to cover his tracks, kills at least one person per book to further his agenda, seems to view violence as rather entertaining, is extremely narcissistic, has a sense of entitlement to a fortune that isn't his and is able to manipulate and charm anyone but the children. Oh, and he's perfectly willing to kill children.
Subverted in book 13 when we find out he loved Kit Snicket and he saves her life and is shocked that the Baudelaires would even think that he would hurt their parents. Also, he has a Freudian excuse - it's implied that the Baudelaire parents killed his parents with poison darts.
IvarRagnarson of The Last Light of the Sun. He doesn't see people as people, murdered his sister for laughing at him, sheds no tears over his dead brother, has to keep reminding himself to speak to people as though they were equals, and loses his temper when irritated. At one point he murders a captured earl just to make sure the mercenaries he's hired won't think of just ransoming him and going home; Ivar has lots more For the Evulz murder and mayhem planned for them. He's the bad guy.
Caine from Gone is confirmed by Word of God to be a sociopath. His Lack of Empathy becomes clear early on, but his status as this is confirmed when he tells a pack of mutated coyotes that they can feed on young (some daycare-age) children because . . . there was no reason not to. He actually manages to be a nuanced character, though; the real monster is The Dragon, Drake.
The movie's central plot essentially is the interplay of two sociopaths. Dickie Greenleaf (Jude Law) is a rich kid who's bumming around Europe on his plutocrat father's dime. Tom Ripley is a young blue collar musician willing to impersonate a fellow Princeton grad, defraud Dickie's father of a rather nice expense account to "convince" Dickie to come back, then play Dickie off his father to bum around Europe. Both display a great deal of superficial charm, little remorse about lying and manipulating others, quick tempers, a willingness to lash out violently when it suits them, and no qualms with defrauding the old man. Dickie has no problem blowing off a young Italian girl he impregnated, and when she is Driven to Suicide, he seems more upset at how this affects him. Tom lies his way into high society and is willing to lie, steal, and murder to stay there. Marge, Dickie's girlfriend, describes how when Dickie takes note of you it's like being in the sun. This is a common trait among sociopaths. Tom has a similar trait and facility for lying. The few moments where either shows an emotion similar to remorse may seem to break the mold, but even real sociopaths are not completely inhuman. Sociopathy exists on a sliding scale.
In the RCN series, Adele Mundy's assistant/bodyguard Tovera is a complete sociopathic monster who knows she needs Adele to act as her conscience to keep her functioning in society, and enjoys, as much as she can be said to, serving Adele (and by extension, Daniel Leary) because it gives her plenty of opportunity for authorized mayhem. For her part, Adele is very scrupulous in not asking Tovera what she does in her free time for amusement when she disappears into the city's slums.
JohnWayneCleaver is a deconstruction of a sociopath: he's completely aware that he is nothing less than a nascent serial killer who has yet to kill anyone, but is also every bit as aware that acting out his fantasies of killing would ultimately lead to his arrest and execution. Having to kill someone to save his mother's life at the end of the first book seriously fucks him up, and leads into the plots of the other two.
In the Red Dwarf novel "Last Human", the alternate Lister is a full-fledged sociopath, nicely outlined in his psych profile.
RichardLopez of Ship Breaker is a drug-addicted, Axe Crazy, Archnemesis Dad who suffers from massive mood swings and a severe inability to connect to other people. He has no qualms about threatening to maim his son, or cut out a girl's eyes, and eventually tries to sell Nita's organs on the black market. His attitude towards his son, Nailer, is especially volatile, shifting from almost fatherly affection to an attempt at Offing the Offspring at the drop of a pin. He kills without remorse, and no one, not even Nailer, is sad when he dies.
In the Privilege series, Kaitlynn Nottingham is this. She kills her best friend's dad, who happens to be her lover, and has no qualms with killing one of her classmates so she can get into a secret society.
John Dread of Otherland is explicitly described as a sociopath, complete with a psychologist telling the police how he was the scariest person he'd ever attempted to treat, because he could tell that Dread did not see him as a person, but merely an object, to be evaluated on his usefulness and killed without a second thought if he became too inconvenient. Dread is given the Freudian Excuse of a drug-addled prostitute mother who brutally abused him in order to turn him into a weapon against the world she hated. It worked.
Francis Begbie from Trainspotting is a violent psychopath who has so many berserk buttons that a regular conversation with him is akin to walking through a minefield. He shows a disturbing lack of empathy for anyone and exudes charm around people, namely Renton's parents, who may be otherwise oblivious to his violent side.
Jadis the White Witch from The Chronicles of Narnia is up there with Iago. Superficial charm? Check. Above average intelligence? Check. Pathological egocentricity? You betcha! Incapacity for empathy or remorse? "So much for love."
In the Young Adult novel Rosebush, it turns out that Langley Winterman is this, as she's the mastermind behind the hit-and-run and she casaully uses and manipulates people to get what she wants.
The eponymous character from the novel Elmer Gantry. Elmer is a charming, jocular preacher who is motivated entired by self-interests and appetites. He has no moral qualms about lying, marital rape, or moral hypocrisy. The film version depicted Elmer more as a loveable scamp than an outright sociopath.
In Across the Universe, Luther is shown to be completely without remorse in any of the stuff he pulls, from trying to rape Amy to raping Vittoria in "revenge" after Amy escapes to trying to incite riots after the population is taken off their mass-spread sedatives to continuing to stalk and harass Amy, wanting to finish what he started. The only reason he seems to have for any of the things he does is that he enjoys having power over others. The only reason he changes his behavior at all is because Amy fights back and makes it clear she'll shoot him if he continues. Even then, he still enjoys scaring her.
While Patch is intended to be heroic, he also shows quite a few signs of being sociopathic, particularly in the first book. He frequently engages in dangerous fights and such just to amuse himself and shows little to no remorse over the fact that he stalked Nora and made several attempts on her life. By Nora's own admission, he's disturbingly good at hiding how he feels and manipulating her. He also shows no remorse or regret over enslaving a Nephil for several centuries, essentially condemning the poor guy to an eternity of having his body stolen by Patch for two weeks out of every year, usually for the purpose of sex with unsuspecting women.
Simona Ahrnstedt has Edvard Löwenström in her debut novel Överenskommelser. He was a sadist, who enjoyed hurting women for pleasure. He made a deal with a fellow sadist that he would get his cousin, even though he knew that she would suffer. He made a 14-year-old girl pregnant, but still abandoned her. When she died after an abortion, he felt no remorse. And when his sister was seriously ill, he felt no sadness about it. He practically wished that she would die, so his parents would think about something else other than his atrocities. He made sure that his cousin was separated from her love interest, which gave her no other choice but to get married to the disgusting man, to whom he and his father had promised her. When his cousin was raped and almost killed on her wedding night, his response was that she only had herself to blame! And he also raped at least one woman, even if that was off screen. Edvard never felt any remorse for anything he did, and he was unable to feel love even for his family. Neither could he feel gratitude. He was too easily bored, which actually is another sign of sociopathy.
Roland Birgersson in "Betvingade" seems to fit into this trope as well. He has already murdered a woman and now plans to murder her son (who happens to be Markus Järv, the story's male protagonist) as well. And he's prepared to also murder Markus's wife and/or let Markus's six-year-old daughter drown to get his way. And to make things worse, it also turns out that Roland is Markus's father.
Shelly Longpeire in The Troop displays the classic signs; Lack of Empathy, manipulative streak, tortures small animals to death for fun, etc. He even tricks Ephraim into skinning himself alive.
Nick Dunne in Gone Girl has shades of this, and even admits to some of the traits. His wife Amy, however, wins the Olympic gold medal in sociopathy. She faked her death and framed her husband for murder as revenge for his infidelity and their crumbling marriage, going to absolutely astonishing lengths to pull off the "perfect crime", and it's hardly the first time she's carried out Disproportionate Retribution against somebody who wronged her (or who she merely thought had wronged her), nor is it the last. She checks off nearly every one of the traits: she's a Consummate Liar and a Manipulative Bitch with a distinct Lack of Empathy and an inability to forge personal connections. And she's damn goodat hiding it.