Bakuryuu Sentai Abaranger: A borderline case is Dr. Mikoto Nakadai, the man is a super smart surgeon who was so bored with his life, that when he became Abare Killer he joined the Evolians and use his powers to what he consider as good use. In which case he formulate his own evil plans that are close to working and make the old villains look comical. It doesn't help the fact that he had a shard of the Evolian god Dezumozorlya.
Jack Welker is an almost perfectly textbook example of antisocial personality disorder. He is ruthless, brutal, cruel and never shows remorse for his actions.
Subverted with Todd. While the creators of the series have called him a sociopath, the issue is that he is too emotionally crippled, quiet, calm, easygoing, relaxed, friendly and self-controlled to even qualify as one. On the other hand, having a sociopathic monster as an uncle and father figure (Jack), it is almost inevitable that he was going to develop a ruthless side anyway.
The Cousins are emotionless hitmen who kill everyone in their way, including innocents who didn't need to die, without flinching.
In Warren's Season 5 appearance he does not exhibit such sociopathic traits. He was more of an Anti-Villain who had created a robot girlfriend and was genuinely bothered when she posed a threat to others and tried to help Buffy contain the threat. However, Word of God is that the writers only made him the worst of the Geek Trio in Season 6 because Tucker Wells' actor (the character had tried to kill the Sunnydale High students with hellhounds in Season 3) was unavailable. Warren would have had Andrew's Anti-Villain conscience and likely a similar eventual redemption arc. It was out of necessity that the writers decided he would have to become a far worse person, wanting the Geek Trio's evil leader to be familiar from a previous episode.
Vampires as a whole are this. Due to their status as The Soulless, vampires are Always Chaotic Evil, and has no moral conscience or ability to feel remorse. Angelus, the Hyde part of Angel's Jekyll & Hyde personality, is the most notable example: he's brutally sadistic, violent, highly intelligent, manipulative, ruthless, and only cares about making people suffer. In the very episode where he first returns, "Innocence," the Judge, a demon with the power to incinerate any being who has humanity (more specifically human emotions) tried to fry him, only for Angelus to No-Sell it; as stated by Giles, only "true creatures of evil" could survive the Judge's Touch of Death.
Cast a Deadly Spell: Amos Hackshaw, a sorcerer who is willing to sacrifice his own daughter and summon the Old Gods to destroy the world so long as he can rule over the ashes.
Citizen X: Andrei Chikatilo, who vents his feelings of inadequacy by raping and murdering children.
Encounters a "pure psychopath" about once a season. Interestingly, despite the hundreds of cases the BAU have investigated, only 9 characters have been listed as genuinely sociopathic/psychopathic. They are Adrian Bale, Nathan Harris (who was not actually a criminal), Frank Breitkopf, The Boston Reaper, Ray Campion, Raymond Donovan and Sydney Manning, Danny Murphy, and Greg Phinney. Of these, The Reaper is probably the worst, being an utterly amoral psycho who killed people for no better reason than a desire for fame, and went after the police when they dared to try and stop him.
Jeremy from the Season 6 episode, Safe Haven is a 13-year old "budding psychopath", with severe attention deficit problems and antisocial tendencies. He can't pay attention to anything for more than a few minutes, has a serious lack of impulse control, lies complusively and convincingly, killed his neighbour's dog, regularly tortures his little sister, and tried to poison his entire family with rat poison in the Thanksgiving turkey. After being abandoned by his mom he goes on a cross country killing spree as he attempts to return home and murder her, killing entire families and torturing the mothers. He has no real emotions (as is repeatedly demonstrated), but fakes them incredibly well, and at one point expresses a very creepy sexual interest in a girl who can't be much more than ten. Rossi suggests that they should keep him on file for a reason.
CSI: Had a few of these as killers of the week. One possibility is the teenage killer in "Unsual Suspect" and "Goodbye and Good Luck". Another appeared on an earlier episode, and it was even lampshaded how she could switch personalities on a whim.
CSI: NY: Had one, possibly two of these. In one episode, a young woman manipulated an older guy into killing a woman at a French Revolution themed party. Stella is annoyed that they can't prosecute the girl, because she didn't commit any actual crime, she just pulled the strings to get the other guy to act.
Torrence, the Big Bad of The Day of the Triffids. Superficially charming, he's introduced calmly stealing lifejackets (including one from a child) while everyone else panics so as to cushion himself in a crashing airliner. His lies are never quite convincing due to their grandious nature, and he's often shown admiring statues or paintings of Winston Churchill, and clearly sees himself in the role, but the government Torrence sets up to exploit the blinded population quickly collapses under assault from the triffids, along with his Faux Affably Evil facade.
The Master is a classic example, although he will generally stop bothering with the suave act and just enjoy himself once he no longer needs to. He fits all traits, and as such, makes an interesting Foil to the show's Bunny-Ears Lawyer protagonist - Both of them are eccentric geniuses with a childish streak and a love for intellectual challenge, but there is one thing that sets them appart: While the Master can be very charming and suave, he has a complete Lack of Empathy. The Doctor, by contrast, has No Social Skills but is generally well-intentioned.
It ends up being subverted with Missy. She starts out like any incarnation of the Master, but throughout her life, shows signs of wanting to be friends again with the Doctor. By the time Series 10 rolls around, she's imprisoned in a Vault as a punishment for her crimes, with the Doctor watching over her in an attempt to cause her to make a HeelFace Turn. Slowly, she starts feeling remorse for those whom she has killed. It culminates in her deciding to stand with the Doctor in his Final Battle, after swinging back and forth between wanting to help him and wanting to oppose him, but her previous incarnation is having none of it and kills her.
Rassilon, the founder of Time Lord society, is most definitely this. He averts the Well-Intentioned Extremist trope by wanting to initiate the Final Sanction not to save the Time Lords, but to save himself. And while trying to save Gallifrey from destruction, he placed a signal in the Master's brain as a child, thus sending the Master insane. By the time "Hell Bent" comes around, he's had the Doctor tortured for 4.5 billion years, still orders the Time Lords (Who decide by then that they've had enough of his shit) to kill him once he escapes, despite the fact that the Doctor is the very reason Rassilon is still alive, and has taken to referring himself as "Rassilon the Redeemer" and "Rassilon the Resurrected".
And let's not forget Davros, the creator of the Daleks. With delusions of grandeur and uncaring of others, Davros is as nasty of a piece of work as his creations, best exemplified when he was willing to destroy all of reality and have the Daleks become the sole remaining lifeforms.
Dark Oracle: Omen appears to be one of these initially, but his genuine liking of Cally and slow development of human emotion keeps him from falling fully into the trope. Villain of the Week Claudia, who believes "if it feels good, do it," might well be a low-functioning sociopath. And then there's the comic book characters, Blaze (a hot-temperedJerkass who has no qualms about breaking a fellow student's arm), Violet (a Manipulative Bitch who enjoys scaring the crap out of her victims), and comic!Sage (who plays mindgames with Lance, screws around, and tries to off several girls with a poisonous snake).
Dexter: Averted with the eponymous Dexter Morgan, the most famous Sociopathic Hero and Serial-Killer Killer on TV, is an example of a sociopath with a 'moral code his father instilled to direct his murderous urges at other killers. As such, he self-identifies as a sociopath but he usually only lies & manipulates his targets or people who are trying to hunt him down or to maintain a facade of normalcy (he initially gets into a relationship with Rita entirely as a disguise). With his Character Development, he's a hybrid of schizoid and sociopath who displays enough guilt, love and empathy to qualify as a reformed sociopath, though it's dubious whether such development is realistic.
The earliest available radio episode involves a gang of holdup men who shared a brace of guns between them on jobs. One of them, Alonso Jackson, is best known for bursting into a liquor store, saying "This is a stickup!" and then letting the clerk have it immediately (shooting him again in the spine later to make sure he's dead).
The final case of the Sixties Dragnet finale, DHQ: The Victims, is the holdup of a mom-and-pop grocery store. When Julio, the husband, implores robber Carl Brooks to leave some dough behind to pay the bills with, Brooks punctuates a taunt with three bullets to Julio's stomach. He is completely unmoved later, in the hospital, when Julio's corpse is being wheeled out while his widow is being consoled by the priest who gave Julio his last rites. Both Jackson and Brooks' lives were forfeit, presumably because of the extra meanness of spirit behind the murders.
The Big Holdup features the "Rattlesnake Bandit", who goes From Nobody to Nightmare in a week or so pulls heists for petty sums simply for the thrill he gets out of injuring people—one victim, a grade school teacher, ends up blinded for life. When the cops show up he comes out guns blazing and is killed in self-defense.
The Big Rod and The Big Accident both feature remorseless hit-and run drivers. In the former episode, when the grieving widower tells the culprit to be glad the Police got him [the hit-and-run driver] first, because "I would have killed you," and all the culprit can say is "Pretty upset, isn't he?" In the latter episode, the hit-and-run driver tries to take solace in the fact that they elderly couple probably wouldn't have lived much longer anyway. In both cases, a disgusted Friday reads them the riot act.
Mister Daniel Lumis is not a killer, but easily the biggest asshole in the entire franchise. He leaves a trail of kicked dogs everywhere he goes, and then expects the cops to respect his my-wants-trump-all attitude, and to excuse without punishment his wronging of everyone around him.
Elementary has Jamie Moriarty. This version of Moriarty personifies every single aspect of this trope with a more personal and realistic approach. Moriarty blackmails and kills her/his own employees, manipulates people just for fun, doesn't even think twice before ruining anyone's life and uses outright violence without the slightest hesitation, disgust or remorse. In "The Diabolical Kind", she even asks Sherlock, the only one she can relate to, how he manages to empathize with other people and be "one of them".
The Flash (2014): The season 2 big bad Zoom has been called as such by his actor in an interview, and his Lack of Empathy and murderous tendencies more than back up that claim. He is also able to lie very well and has a certain jovial charm to him, as well as an overly inflated sense of self-worth to the point that the suggestion of someone being superior to him is a Berserk Button. After his initial scheme to save his own life succeeds, he demonstrates the characteristic poor impulse control of a low-functioning sociopath, moving from one plan to another whenever a new one comes to mind as being amusing (kidnapping Caitlin, taking over Earth-2, then destroying the multiverse). He outright admits that stealing Jay Garrick's identity was more or less solely done to sate his boredom, and even using a time remnant as part of posing as Jay for Team Flash seemed more about the inevitable payoff of killing the remnant in front of them, thus leaving them all devastated, rather than any practical reason.
Galavant has Madelena, the innocent peasant girl forced to marry the evil king, who upon being granted a position of power immediately abused everyone she could and schemed for more. When she and Galavant have a long song together she says that she loves him "as much as someone like me can love anyone", only mentioning sex and how well they look together as why.
Quite a number of these characters crop up, including (but not limited to) King Joffrey Baratheon who stands out in a show full of bad people doing bad things.
Roose Bolton is a high-functioning example. While initially appearing to be a faithful (albeit extremely ruthless) lord in Robb Stark's service, he is ultimately revealed to be a depraved tyrant who delights in all forms of cruelty and harbors no loyalties to anyone but himself. While savvy enough to act polite and modest when it serves his own interests, Roose never passes up an opportunity to torment others for his own amusement when he can get away with it. Moreover, he shows no attachment toward those around him including his own son, Ramsay, whom canon confirms he all but completely ignored until the death of his firstborn son left him without an heir. Ultimately, any doubt as to Roose's lack of empathy or semblance of conscience is put to rest when he smugly recounts to a stunned Ramsay how he brutally raped his mother when he was conceived.
Ramsay has no empathy for any living thing. He is also a consummate liar, a thrill-seeker who tortures or hunts people for fun, he has an inflated opinion of his own abilities and he's bad at long term planning.
Harald Karstark doesn't seem to be bothered in the least by Ramsay murdering his father right in front of him (nevermind the fact that Roose avenged Harald's father, which is the entire reason why he sided with the Boltons), and immediately begins telling others to address Ramsay as Lord Bolton. Lord Umber also implies that he's a pedophile.
Gregor Clegane is the most clear-cut example in the entire series (which is saying something in a story overflowing with vile and loathsome characters like Joffrey and Ramsay). While his appearances are few and far between, the few scenes in which he does appear along with the sheer magnitude of his crimes make it glaringly apparent that he lives only for wanton carnage and brutality. Likewise, he is consistently portrayed as almost entirely lacking in impulse control except at the basest levels of Pragmatic Villainy. Furthermore, he is COMPLETELY devoid of empathy or principles given that he permanently maimed his brother for playing with one of his toys and is all but explicitly stated to have murdered his father simply to expedite his own inheritance (while being the object of Parental Favoritism no less).
Euron shows characteristics of a classic sociopath, even moreso than the likes of Ramsay and Joffrey. Superficial charisma, lack of conscience, willingness to manipulate others to achieve his own ends...
Has a few among its villains, like Arthur and Sylar.
Sylar's own father is a case. When asked why he murdered Sylar's mother and sold him to another family, he replies that he doesn't even remember because "it didn't matter to me."
House: A memorable patient in one episode is identified as a sociopath, by both the short hand and proper medical categorization. Notably 13 only recognizes her as such because she's terrified of her, with House saying it's a survival tactic, implying a common association with sociopaths to predator animals. Ultimately it turns out her apparent sociopathic behavior was actually a side effect of some other unrelated medical problem, and she "reforms" by the end of the episode.
The Sinners from House of Anubis, as a result of being The Soulless and having no conscience. They are manipulative, chaotic, completely uncaring of who they hurt (and do it often just For the Evulz) and determined to get their way. They even seem to have no emotion beyond amusement and anger.
House of Cards (US): Frank Underwood is this long before the show even starts. While the audience may at first be able to sympathize with his desire to screw over the people who wronged him, he progresses into using things like bribery, blackmail, manipulation, threats, and even outright murder with worryingly little restraint. He sees everyone around him as objects to be utilized for his own agenda, his relationship with his wife Claire is strangely loving but incredibly twisted, he has a massively overblown ego that repeatedly causes him to shoot himself in the foot, (namely by needlessly antagonizing people he still actually needs) is a pathological liar, only really seems to care about his own lust for power, and feels no sympathy or remorse for the lives he's ruined to get to where he is. On top of all that, he really only seems genuinely capable of feeling sorry for himself.
iCarly: Nora Dershlit. The only thing she cares about is to make friends, but her perception of what counts as "friends" is so horrifically skewed that she believes locking the iCarly gang in her basement against their will qualifies, ignoring their repeated expressions of the fact they don't even like her, believing she can force people to be her friends. She has absolutely no remorse for holding people against their will and outright tries to murder Gibby when he comes to save the iCarly gang. In her second appearence, she once more holds them against their will by holding Spenser hostage and torturing him on a giant wheel to keep the iCarly gang under control, even implying she can and will kill him if it comes to it. She also shows the Manipulative Bitch qualities of the trope, feigning remorse for her actions to trick the iCarly gang into agreeing to release her from prison and luring them into her trap again. She's also confirmed to be a sociopath In-Universe, even referring to herself as one:
Carly: Nora... You're a nutcase!
Nora: The correct term is disturbed, lonely sociopath.
Every character is a sociopath. They're frequently doing things that are unethical if not illegal, stabbing each other in the back, and no one in the gang is able to stick to a plan.
Dennis deserves a special mention. Some of his actions even leave the rest of the depraved gang disgusted. In one episode, Dennis accidentally admitted that he has no feelings.
He also shows more of the symptoms then the rest of gang. For example; Dennis has the superficial charm, fans sometimes comment on how he seems the most normal yet turns to be the most depraved of them all, plus he's good at getting chicks sometimes. He also seems a very cold calculated yet shallow understanding of human emotion. For example, Dennis' technique to get women (the D.E.N.N.I.S. system) is very cold and calculated but also very unsympathetic and fails to work at the end of the episode. Dennis also has the grandiose sense of self-worth that is a symptom of sociopathy.
In the episode "Psycho Pete Returns", a psychiatrist diagnoses Dennis with Borderline Personality Disorder, a serious mental illness marked by unstable relationships, inability to regulate emotions, and impulsive behavior.
Dennis & Dee's mother Barbara was worse than the two put together. She married Frank for his money while lying to him and her children about their parentage for 30 years (and acted as though she was discussing the weather during her confession), emotionally abused Dee throughout her childhood and left her nothing in her will while calling her a mistake, and one of her final acts on Earth was stealing medicine from sick children.
For a franchise aimed at children and teenagers, Kamen Rider has had many examples, ranging from low-functioning brutes to high-functioning egotists. The franchise's most iconic villain, The Great Leader of Shocker, is a classic example. Suffering from an intense A God Am I, the Great Leader is responsible for founding terrorist organizations and trying to exterminate the population of Japan on numerous occasions. His ego is so fragile that he even attempted to kill his own son for defying him.
Kamen Rider 555 introduces us to another iconic example from Kamen Rider, Masato Kusaka. Kusaka is driven by two things, a desire to kill all Orphnochs and to have Mari all to himself. Despite this, Kusaka is also exceptionally charismatic and manages to keep his true nature hidden from nearly everyone (except Takumi), and a skilled manipulator who effortlessly sabotages Takumi and Kiba's friendship for his own goals. There's also Kitazaki on the Orphnochs' side, a remorseless assassin who massacres people for fun and is incredibly self-absorbed, believing himself to be the strongest Orphnoch to the point where he's willing to murder a child in order to keep it that way.
Kamen Rider Ex-Aid introduces Kuroto Dan, who might be a more extreme example than either Ryoma or Banno. Kuroto is the egomaniacalCEO of Genm Corp., who views his talent at designing video games as being godly and displays a complete Lack of Empathy to both other humans and his Bugster allies, viewing them all as simply pawns for him to manipulate. He is prone to intense rages whenever someone has an idea as good as his, infecting Emu with the Bugster virus while he was still a child out of spite after seeing his game ideas and permanently deleting the Burgermon Bugster for being from a game not designed by him. Despite his malignant impulses, Kuroto effortlessly keeps his insanity and narcissism hidden behind a Mask of Sanity, even managing to feign remorse for his actions at one point to infiltrate CR and get the last of the data he needed. Subverted after Kuroto comes Back from the Dead. psychotic and possibly even more insane than he was before, but it's also revealed Kuroto genuinely loved his mother at one point and he's even shown to care for Poppy. He's willing to assist CR in stopping the Bugsters too ( thoughmostly to get back at them for betraying him).
Kuroto's father Masamune Dan is another straight example. He's very charismatic, able to put up the facade of being a Benevolent Boss all while being a remorseless manipulator. Valuing no one but himself, Masamune sees the Riders and Bugsters as nothing more than products of the Genm Corp and the rest of humanity as simply lives for him to manipulate and control. He kills Hiiro's girlfriend to punish him after he refuses to murder one of his friends and later attempts to instigate a global Bugster virus pandemic to digitize everyone so he can become the controller of all life. As his plans get derailed, Masamune becomes more unhinged, culminating in him committing suicide after he's defeated out of spite to prevent any victims of the Bugster virus from being saved.
Killing Eve: Villanelle displays most of the symptoms, however she still seems to have genuine feelings for Eve, Konstantin and of course Anna.
The Kill Point: Mr. Rabbit, who manages to be the Token Evil Teammate of a bank robbing crew. He beats the hostages unprovoked, psychologically tortures one of them for no particular reason, carries around the severed ear of an Iraqi soldier he previously tortured to death, and tells Captain Cali that he considers the hostages "cattle" and "sheep being led to the slaughter." He ends up getting beaten to death by the leader of the team, because Even Evil Has Standards.
Kings has Andrew Cross, who makes for an ugly contrast with the narcissists who compose the rest of his family. A bored, listless young man who admits to viewing other people as things (and doesn't seem to understand that this is wrong), Andrew displays a very limited emotional affect, moves impulsively from idea to idea, and has some very troubling sexual urges, as evidenced by his stalking of his aunt, and his leaking of his cousin's nude photos to the press. In the end, Andrew sides with his father's coup, only to betray him to his uncle Silas when it fails, and then, in the closing scenes of the show release Vesper Abaddon from prison with no prior explanation, all with the same perpetual bored look on his face. Whether Andrew has any genuine goals, motives, or loyalty in him, is left in serious doubt as of the end of the show.
Had a serial-killer prostitute (based on Aileen Wuornos) who displayed the "cocktail personality" where she'd become a troubled mentally-frail patient for the psychiatrist or a seductress for Detective Stabler. Her son was the only thing she cared about and it turns out she killed his mother and kidnapped him as an infant.
One doctor did point out that not all sociopaths are evil unrepentant killers, most of them live normal lives like everyone else in their own way.
The wiki has an enitre page for listing all the sociopaths that have shown up in this show.
Lost: Anthony Cooper, Locke's father, is one of the most chillingly accurate depictions of a sociopath on television. He's a very successful con man who has made an entire career out of manipulating people and then dumping them once he's got what he wants. Sawyer's parents are just two of his victims, and he's not remorseful about that in the slightest. He abandoned Locke at birth, reconnecting with him only to steal his kidney. He has no qualms about murdering anyone who might expose him and even throws Locke out a windowfor trying to reason with him. He's entirely concerned with himself and shows no regret for any of the many lives he has destroyed.
This seems to be how people end up after losing their "shade", to go by Martin Chatwin and Julia. The shade is the part of a human soul that governs pain and fear—but also guilt and love. People without shades have all the classical sociopath traits of being friendly, sociable, happy, but always just a little bit off. They have absolutely no empathy whatsoever, and will often sing while performing the most horrific crimes for even short-term gains. At one point, Julia burns down a forest of sentient trees, rendering the entire species extinct, for no reason than because she thought it might get her home a little faster. When it is brought up later, she jokes about it and has to stifle a giggle. This is eventually deconstructed when Julia decides she wants to be a good person again, but has no idea how. She ends up sitting in her apartment, paralyzed with indecision, as she can't figure out if even the tiniest things are evil or not.
Julia: I never once stopped to ask if I was doing the right thing, and now it's all I ask — "If I did this, would Q look at me like I'm evil?" I can't really feel any of it anymore. I'm doing it from memory.
Niffins also behave in this manner, calmly killing even the people they once loved. It turns out Niffins lose their shade when transforming.
Red John in The Mentalist is a ruthless manipulative narcissistic serial killer, capable of killing anyone —including an innocent woman and a child just because he felt insulted— and controlling a large criminal network.
In the Merlin (1998) mini-series, Mordred is blatantly a sociopath. Outwardly a handsome, charming, charismatic young man, Mordred is actually a callous, manipulative, sadistic hothead who wants to conquer Britain and kill his father. He practices archery on his castle's servants, kills several soldiers while laughing and jesting with them, and laughs when his own mother is murdered in front of him. And he's a Super Soldier with the backing of an evil goddess. Yikes.
Million Yen Women: The person who invited the women to live in Shin's house and eventually ends up killing a couple of characters before getting put out of commission, turns out to have done it all for no other reason than their own amusement.
In the first season, Erich Blunt shows every sign of being one, expressing no empathy or remorse for anything, and with an interest in other people only so far as they please him or he can manipulate them to do what he wants. His PA/girlfriend Ivana shows much the same traits as well.
The second season has Alfred "Alfie" Rentman, leader in a mass murder on a school bus, whose own father (a neurologist) had diagnosed him. There was nothing he could really do about it though, since it's an incurable and untreatable condition.
Mother Gothel/ Eloise Gardener is no exception. No qualms with hurting anyone nor with using them to further her agenda only to discard them afterwards. Nor does she have any feelings toward her own child other than an accessory to her plan to wipe out humanity.
Perfect Assassins: Dr. Samuel Greely, who experiments on psychologically torturing children into becoming assassins, frames his assistants to prevent him from being caught, and laughs at his victims being beaten.
Power Rangers Wild Force had Master Org/Dr Viktor Adler. He killed his former best friend for "stealing his love" and said love for not knowing his feelings. He then set out to destroy mankind for his perceived suffering.
Power Rangers Megaforce had Vrak. He cares nothing for anyone except his one plans, manipulates anyone and everyone around him, crushes Metal Alice's spirit upon her death (in spite of the fact that she saved his life) and mocks his own dead brother.
The Villain Protagonist Jim Profit of Profit is the high-functioning type. He's an amoral and remorseless schemer who manipulates people around him to his own ends (including blackmail and murder) while presenting himself as a charming, likeable guy.
Red Dwarf: The episode "Cured" reveals the Cat to be a psychopath, but a relatively harmless (if incredibly self-absorbed) one. Unfortunately for the Boys, Professor Telford is the violent type of psychopath. Un-unfortunately, the Cat exploits Telford's own psychopathy to get him to hand him a gun, which he then shoots Telford with to save his crewmates.
Red: Werewolf Hunter: Gabriel, a werewolf who believes he should be able to kill humans for fun, and decides to turn the opposition's boyfriend into one of him just to spite her. In fact, he's so inhuman that he's the first werewolf to be able to turn at will.
Reign of the Gargoyles: Lieutenant Mueller, a coldhearted Nazi who doesn't even blink at the thought of killing children as an interrogation tactic.
Sergeant Will Strausser, at least as of "Sex and Drugs" is being deliberately set up as one. "Ties That Bind" has Miles Matheson and Strausser discussing the fact that Strausser is one, with Miles pointing out that Strausser was going to be put in a padded room before the blackout happened. "Nobody's Fault But Mine" has Strausser threatening to rape Charlie Matheson to Rachel Matheson's face, and he actually tries to rape Rachel when it's just the two of them alone. Fortunately, Rachel manages to kill him off.
Sharpe has Obadiah Hakeswill, the Arch-Enemy of Sharpe and the reason why he was condemned to 2,000 lashes (of which only 200 were given). Lack of Empathy? Check, just ask Sally Clayton's children, after he raped and murdered their mother, as well as any unfortunate soldier he bullies into staying quiet about his abusive conduct. Consummate Liar and Manipulative Bastard? Double check, as he makes himself appear disciplined in front of superior officers and rapes the wives and girlfriends of the rank-and-file, while getting those who are wise to him in trouble, like Harper, who he framed for the theft of an aristocrat's wife's portrait, condemning him to 100 lashes. Need for stimulation? If there's a pretty woman in the episode, he'll try to rape her and if she has a husband, he'll threaten him too. Narcissist? He believes himself invincible right up to his death. He's even worse in the novels, where his crimes include raping a young girl... when he was 12.
Sherlock: The eponymous character's Arch-Enemy, James Moriarty, is this trope played very straight: he has no empathy whatsoever, is a liar, charmer, and manipulator who easily surpasses Sherlock in all three departments, is a criminal mastermind who has orchestrated scores of crimes—up to and including murder—throughout Europe merely because he was bored, and by the end of season 2 has single-handedly wrecked Sherlock's credibility, career and relationships. The difference between the two is probably best underlined when they first meet face to face.
Sherlock: People have died. Moriarty: That's what people DO!
Subverted by Sherlock himself. While he identifies himself as a "high-functioning sociopath" and is shown to usually have a lack of sympathy for those around him, he is shown to care for various characters (his concern when Mrs. Hudson and John are in danger, his sadness over Irene's alleged death, and his reaction to humiliating Molly at the Christmas party). Word of God is that Sherlock wants to be a sociopath (because caring about people gets in the way) but isn't.
Lx-3, Lex's clone and Shadow Archetype from Season 10's "Lazarus" is a solid example. He spends all his time on-screen committing mass murder, has a Hair-Trigger Temper and a sadistic streak, seems to actively enjoy murder for its own sake, and hates everyone. He tries to kill every person he meets.
Bob Rickman, corrupt salesman with Mind Control powers who has no qualms making his enemies kill themselves or brainwashing innocent people to kill for him. His pesticide plants were massively toxic, spreading cancer and environmental damage, which he took delight in being able to get away with thanks to his powers.
SS Doomtrooper: Dr. Ullman, a coldhearted Mad Scientist doing experiments to make Nazi super soldiers. He does not care about his bosses' cause, only that he can win the war and revolutionize genetics at the same time.
The Goa'uld are this as a matter of course. It's indicated to be, at least in part, to do with their use of the sarcophagus, which has this effect even on humans who use it regularly.
Linea is a textbook example, coming off as a perfectly charming and kindly old woman. However, she's a frighteningly brilliant Mad Scientist who can MacGyver fusion power from plants, and successfully creates a Fountain of Youth (with the side-effect of Easy Amnesia, though that can also be cured, while retaining the youth). She's also got a stunning degree of Lack of Empathy, earned her nickname 'The Destroyer of Worlds' (an engineered plague was involved), only spared the SGC because they helped her and it Makes Us Even, and when she reappears, her good personality, Ke'ra, makes it plain that while she personally cares deeply for Daniel, Linea would happily kill him without batting an eye.
Kivas Fajo from "The Most Toys" is, to those who meet him briefly, simply an eccentric collector of rare artifacts from the Local Bubble. However, he is utterly without pity, and kidnaps Data—already legally established as a person—as the centerpiece of his collection. Another of his prize items is the dreaded Varon-T disruptor, illegal in the Federation because of how horribly it kills the target. He actually uses it on a broken employee simply because it amuses him to pose Data with a moral dilemma.
Sam Winchester exhibits classic sociopathic behavior when he loses his soul in season six. Though he becomes an example of a pro-social version, as his interest in hunting remains constant, but his Lack of Empathy becomes his defining character trait. He sees nothing wrong with purposefully letting his own brother get turned into a vampire, letting 150 people get turned into monsters because there's a chance it could lead him and Dean to an Alpha, using a baby as bait, working with Crowley or with killing Bobby Singer in order to avoid getting his soul back among other things. It is implied and later shown that he killed innocents and did some things that arguably would make him cross the Moral Event Horizon and even hardened hunters like Samuel Campbell and Dean are horrified by his behavior.
While introduced with having humanizing characteristics and redeeming traits, and being played as Tragic Villain, this is ultimately Lucifer's true nature. He claims that the reason he fell from Heaven was because he, in his own words, "loved God too much", but it's revealed by Archangel Gabriel that the real reason he fell was because, when God made the humans and declared them his greatest creation, Lucifer, God's favorite angel, couldn't handle the fact he wasn't the favorite anymore, and in a act of defiance, tortured the human women Lilith into becoming the first demon. Lucifer has many characteristics of sociopath including: Inability to empathize, manipulative and charismatic, monstrously high opinion of himself, throwing childish temper tantrums when things don't go his way, and absolute refusal to admit any wrong doing. Gabriel even says to him that he is incapable of feeling love and empathy and only cares about being feared, being worshiped, or both. In season 12 he fathers a Nephilim son named Jack, and spends the majority of season 13 looking for him. When he finally meets him, it appears he wants to form a father-son bond with him, but it's hinted at that he is more interested in harnessing Jack's powers for his own use than any genuine desire to connect with son, not unlike how most sociopaths pretend to form bonds with others for their own self interest in Real Life. What truly cements his status as this trope however, are his actions in the season 13 finale. He makes a deal with a alternate version of Archangel Michael to invade the main universe's earth: Lucifer gets his son Jack, Michael gets earth. When he's scout the Winchester bunker, a refugee named Maggie spots him, and he bashes her head against a rock until it splits open. When Jack finds out about this, he rightfully calls him a monster. Lucifer goes completely Ax-Crazy in response and steals Jack's grace for himself and forces a Sadistic Choice upon him and Sam by trying to have one kill one another, even coldly remarking to Jack how he can always have another child, and proclaiming his new goal of destroying the universe and remaking it so he can be the new God.
Chad Morgan, a misogynist who fixates on his English professor, drugging her so he can take compromising photos and blackmail her into a relationship. He flat-out admits that he does not care what she feels about anything, only his own needs.
Julie Eldridge, who pretends to be mild-mannered English teacher and perfect victim for predatory men, only to manipulate them until she gets bored and kills them. She does not do this out of any moral standard against sexual predation, but solely for her own amusement.
Dan Egan from Veep. The show is giving less-subtle hints that Dan seems to be of the high-functioning variety. The fact that he reveals that he killed a stray dog as a child to win a dare leaves little room for doubt. He later claims that he once "broke off an engagement at an Applebee's and then ordered dessert."
The Walking Dead: Simon is a perfect textbook example of antisocial personality disorder. He's cruel, sadistic, unpredictable, and has murdered countless innocent people with children included.
Rake: Cleaver defends two teenage girls charged with manslaughter who he eventually realizes both have this disorder, and actually committed premeditated cold-blooded murder. They're explicitly compared to Leopold and Loeb, two similar (though male) "thrill killers" in Chicago during the 1920s.
Vampirella: Vlad Dracula, who kills the king of his planet because he believes drinking artificial blood has made vampires soft, and then goes to Earth with his army to prey on humanity.
Joe Caswell in "Execution" has lost track of how many people he's murdered, and when they string him up to be hanged tells the father of one of his victims that he'd do it all over again if he had the chance.
Paul Johnson from the same episode is a petty crook who kills Caswell simply because he's in the way, and then tries to ransack the place—in the process inadvertently beaming himself into his comeuppance at the hanging eighty years earlier.
"A Nice Place to Visit" gives us petty crook Henry Francis ("Rocky") Valentine, who's gone from head of a juvenile street gang while still in grade school to a petty thief who's shot resisting arrest. He does get what's coming to him: an eternity of frustrating boredom.
In "Death's-Head Revisited", former concentration camp commandant Gunter Lütze had tortured helpless captives during the Holocaust, and called it "the good old days", but when it dawns on him merely that he might be imprisoned, he cries inhumanity. He gets what's coming to him (after a trial that looks like a rejected last chance to repent): to hallucinate being put through everything he put captives through.
Peter Craig in "The Little People" wants to lord it over others, and finds a planet populated with microscopic people. He lords it over them until he is accidentally crushed himself by a giant alien explorer.
In "The Jeopardy Room", Commissar Vassiloff prides himself on being an artist in killing and cruelty. He, too, gets what's coming to him: thanks to the stupidity of his right-hand man Boris, his own cruelty literally blows up in his face.
Vincent Swan of the BBC comedy White Gold ticks a lot of the boxes - superficially charming, but he will sell out anyone if he thinks he'll profit from it, including his own sales team, he lies to customers, friends and his family alike, cheats on his wife twice (once with his son's teacher, no less!) with no remorse and only fakes contrition when he gets caught, is a distant father to his children and prefers buying their affection with expensive presents than spend any actual time with them and he's convinced he's a Magnificent Bastard, when in reality he's nowhere near as smart as he thinks he is and gets by merely because he's Surrounded by Idiots - the moment Ronnie Farrell, an actual gangster, shows up, he starts to realise he's quite out of his depth, but that still doesn't convince him to change his ways because he gets off on the adrenalin too much.