Cartoons have always been home to supervillains whose whole lives seemed to be dedicated to committing evil acts, without any redeeming qualities to speak of other than humor. And then there are some who took it even further. Much further.
See:
Robotnik, unlike the Affably Evil version of him you'd see in other Sonic cartoons, (or the games themselves) is much less pleasant. He is willing to deprive innocent creatures of their free will to get them to work for him, he is willing to turn formerly beautiful communities into severely polluted wastelands, and he doesn't show any remorse for any of this. He doesn't just turn people into his robotic slaves if they don't obey him, he even turns the ones who DO obey him into robotic slaves.
Note also that the implications of said robotic slavery are much more serious in SatAM than they are in other Sonic cartoons and in the games Adventures of Sonic the Hedgehog and Sonic X portray Robotnik's henchrobots as feeling either genuinely loyal to him or at least inclined to try to help, while the games leave it a bit more ambiguous, but seem to treat it lightly, and almost all of the Undergroud ones are nonsentient; in this version, at least some of Robotnik's henchrobots are quite aware of what's happening to them, and morally objecting to that which their robot bodies are forcing them to do. There are episodes in which some robots are carrying on secret conversations with their loved ones, from before roboticization, only to double over in apparent pain before proceeding to attack said loved ones because of the control Robotnik has over them through said robotic slavery.
For comparison purposes, the worst thing the Robotnik from Sonic Underground did was tricking Manic with a robot made like a baby hedgehog in the hopes that he'd get attached to it — and reveal where Sanctuary, a place of refuge for children and infants was. So he could destroy it and roboticize the inhabitants. Despicable, to be sure, but just not on the level of the SatAM version.
Ixis Naugus. he didn't do anything in particular that puts him at the same level as Robotnik but if the SatAM Robotnik is AFRAID of him, he must be one sick bastard!
Avatar The Last Airbender: Fire Lord Ozai, a genocidal, child-abusing fascist dictator who has dedicated weeks at a time and large portions of his national army to hunting down and killing a twelve-year-old and his friends. Perhaps best exemplified in the first episode of the four-part finale, where his reaction to news of rebellions in the Earth Kingdom is to try to incinerate the entire continent. While the aforementioned heinous act is his crowning achievement of irredeemable abomination, he's also manipulated his wife into murdering his father to usurp the throne from his grieving older brother Iroh - and then thanked his wife with banishment from the Fire Nation - and physically abused his son Zuko, by burning his face for speaking out of turn, and shooting him with lightning when he decides to join Aang. Furthermore, he also cruelly manipulates his daughter Azula into becoming his perfect little villain, to the point where she completely wrecks her emotional and mental health from the pressure, only to reveal that he doesn't care about her at all, and will discard her as quickly and easily as everyone else. He feels no remorse for any of this.
The Spectacular Spider-Man offers us Norman Osborn. For his inclusion in this trope to be justified, you need know just one thing: he framed his own son Harry... in a way that involved him breaking Harry's ankle with his bare hands.
Oh, did we mention that unlike many versions of Osborn, the Super Serum he took didn't drive him insane? Everything he did, he did with a clear head and full comprehension of his actions. He's not crazy, just evil.
Well, actually, the only guy who says it didn't drive him insane is Osborn himself. It's perfectly reasonable to assume that it did drive him crazy, but he's just too crazy to realize that. The only way to know for sure would be to compare him with his pre-Serum self, which we can't since it's been canceled, if it would ever show us that anyway. Those many versions of Osborn have denied being crazy as well, you know, and the mainstream one once admitted that while he might have been crazy once, he was now perfectly sane....whilst he was about to blow up a building filled with Peter Parker's friends. Lampshaded by Spidey saying that's the scariest thing he'd said all night.
Word Of God is that it was intended to be ambigious whether Osborn was insane or not (and if so, what caused it), but he's definitely evil.
The Grundel from The Real Ghostbusters is a loathsome, vile and creepy creature who goes around ruining the lives of children (by turning them into Grundels by encouraging them to commit bad acts and become corrupted) for no reason besides the amusement. Considering the Grundel was supposed to be An Aesop subtly warning children about pedophiles, its not a surprise that the Grundel is so loathsome. Seriously, mash together Satan and a pedophile and you would get the Grundel.
He's even creepier in Extreme Ghostbusters where his behaviour towards Kylie is somewhere between Hannibal Lecter and a sex offender. And he turned Roland's kid brother into a Grundel too.
Dark Danny/Dan Phantom, from Danny Phantom. He is the only villain in the show who has actually been implied to kill anyone, which is saying a lot for a Nickelodeon show. His origin (and for some, his entire episode) is considered to be Nightmare Fuel. Singlehandedly handicapped multiple ghosts and ruined what is implied to be a very large portion of the Earth. The guy is so bad, that this is the only time that the Master of Time has had to interfere to keep it from happening.
The Adventures of Jimmy Neutron has several of these, but one who really stands out is evil Jimmy. His first appearance isn't that nasty (he managed to escape being frozen with the other clones Jimmy made, not much else), but in the later episode, "The Trouble with Clones", the real Jimmy brings him to his lab in an attempt to de-evilize him and make him good so he can help him try to break a record. But while Jimmy briefly leaves the lab, evil Jimmy breaks a tube, which causes the de-evilizing juice to leak out of Jimmy's machine, and Jimmy doesn't discover this until after evil Jimmy has put Retroville under his command. But then, he finds out that evil Jimmy has made a duplicate earth, where Jimmy flies to and is shocked to see that EVERYBODY there is also a Complete Monster. And then, after Jimmy has been chased home by an angry mob of school students (after he thanked Ms. Fowl for complimenting him on being bad), he discovers that Judy and Hugh have been ordered by evil Jimmy to capture Jimmy for experimentation. Once both Jimmys are in the lab, evil Jimmy sets the signal to have the real earth fade into oblivion, but good Jimmy stops it with no time to spare. As if that wasn't enough, when good Jimmy tries to escape, evil Jimmy breaks a microchip that turns into a black cloud of dust that chases good Jimmy out, which he narrowly escapes. Horrifying, indeed.
There was also Meldar, who ran an intergalactic game show where he blows up the losers' home planet! Not even Tim Allen's funny delivery in voicing the character could change the fact of how evil he was and that Jimmy and the others treated him as a very serious threat.
There was also Jimmy's Cousin Eddie from that one episode with Jimmy's great aunt Amanda's birthday. His atrocities include rigging the presents Jimmy made for the party and causing them to explode, which got Jimmy punished and sent inside, seizing Jimmy, Sheen, and Carl in shrinking rings that would completely squeeze the life out of them, and draining Goddard's battery so he couldn't save them. Even worse? He's a BABY who claims to be smarter than Jimmy. And he isn't seen until after Jimmy figures out that the presents weren't rigged by adult neutrons, which is saying something.
Verminous Skumm from Captain Planet. While the other eco-villains were certainly Card Carrying Villains bordering on Stupid Evil territory (except Corrupt Corporate Executive Looten Plunder, and Duke Nukem, whose physiology was such that he thrived on radiation), they were too muchof a caricature to be really scary. This doesn't apply to this disgusting rat-thing, whose actions are almost always portrayed in a much worse light than those of the other villains. Just an example? Peddling mind-affecting drugs to teenagers (one of which was Linka's cousin, who died as an indirect consequence of his intoxication) just for the joy of ruining their lives and those of their friends and families. Harrassing a kid who's HIV positive and spread lies about AIDS just because the kid's an easy target. Or trying to force toxic food down the captured Planeteers' mouths to kill them in a needlessly and horrifically painful way. Or provide a Nuclear Bomb to an Irish Protesant/Catholic feud. Or... well, the point has been made.
Zarm is pretty nasty himself, who as a god, likes to create wars for FUN
There was also that one time Dr. Blight and her future self went back in time to World War II and were perfectly willing to sell a nuclear bomb to Hitler (Okay, he was a Captain Ersatz, but it was blatantly obvious who he was supposed to be). They were only reluctant in the end because he wasn't willing to actually pay and was taking it by force. It's also implied that the blueprints for the bomb left behind at the end of the episode are responsible for the bombing of Hiroshima.
Mega Man: Wily would qualify, having attempted to send the moon out of its orbit to kill off most of humanity, forcing the survivors (if there were any) to consider him king, so he could prove he was better than Dr. Light. This alone doesn't qualify him, he's also tried to use earthquakes to destroy cities, threatening to destroy them if they don't obey, and he's tortured Mega Man mentally twice in the show, first by making him wonder if he's just a mistake created by Dr. Light, the second time making Proto Man be a Heel Face Mole, even Proto Man considered this act wrong during the plan. And ordered him to kill Mega Man after this.
The Queen of the Crowns from Galaxy Rangers. Her Majesty starts off by ambushing Kirwin, and putting a heavy bounty on humans to every two-bit thug in the galaxy. We find out why - she's mashing the humans down for Life Energy to power constructs through which she can see, hear, and administer her Empire. It's not only an exceedingly painful process, but the poor bastard is fully awake and aware of what's happened. We also see that she slaughtered millions on the planet of Tortuna, leaving a few, domed cities behind in a lot of wasteland. She also was hunting humans because the last race she used to power Slaverlords has been hunted to near-extinction and she needed replacements. If that wasn't bad enough, she enslaves an entire planet, making the inhabitants work in concentration camp conditions to build a massive hyperspace cannon she uses to blow a chunk out of Earth's moon, threatening to do worse to Earth unless they gave her 5000 humans in tribute. On a personal level, she uses the only psychocrystal she's made from a human (Zach'swife) to commit Mind Rape nightly on both of them. Her voice actress in the American version unfortunately sounds like a cross of Ming the Merciless and Maleneficent. The German actress comes across as far more menacing.
The Trix from Winx Club qualify. Whenever they aren't trying to fuck the universe up they're generally making other people's lives miserable for shits and giggles. They all have at least one case of Disproportionate Retribution, have maimed or screwed over at least two individuals (Mirta and Galatea), have numerous attempted homicides to their name....counting it all would make one hell of a drinking game.
The Wizards of the Black Circle in Season 4 are real pieces of work. They commit atrocity after atrocity in their quest to corner the market on Earth's magic by sealing away all of Earth's faeries. Their first meeting with the last Earth faerie Roxy, a nineteen year old girl who has no idea she's a faerie and thus is no real threat to them, is also really, really creepy. In one episode they turn the adorable magical pets the Winx have been putting up for adoption into horrible monsters as a distraction. After pulling an I Surrender, Suckers gambit, they laugh with glee at the prospect of trapping the Earth faeries in a hellish abyss. Finally, unlike the Trix, they actually succeed in killing off one of the heroes, namely Nabu. Their leader Ogron even steals the Deus ex Machina that could have saved him and wastes it on a flower, again with an Evil Laugh. These guys are the biggest reason Season 4 is considered Darker and Edgier than the rest of the series.
Chris, the Sadistic Host of Total Drama has crossed this during World Tour. He has been shown killing interns on screen now, for instance. And his challenges for the contestants get more and more brutal. And most importantly, he's the only character whose Comedic Sociopathy can sometimes cease to be played comedically, making him the only contender for this trope. Its no wonder why Word Of God says he's the series true villain, rather than Heather, Justin, Courtney, Alejandro, or Blaineley.
Batman The Brave And The Bold: Starro's faceless henchman definitely counts. At first we think he was forced into working with Starro because he threatened to destroy him and his entire race. But actually, he willingly joined Starro because he was a warmonger who hated the peacefulness of his home planet, even helping to finish the job. himself. And that's not just going into what he did to B'wana Beast
He hasn't got a patch on the Psycho Pirate, whose plot involves the Mind Rape of three innocent (if superpowered) teenagers.
Don't forget General Zahl, who murders the Doom Patrol.
Steele from Balto seems to be your average animated movie Jerkass at first - making fun of Balto, flirting with Jenna even though she's not interested, etc etc. All par for the course. But when he crosses the Moral Event Horizon and refuses to let Balto help them take the crate of medicine to Nome, thus almost condeming the children who desperately need it to certain death from diptheria, just because Balto would prove better than him...well, I'd just like to see anyone try to Draco in Leather Pants him after that. Balto was forced to beat him in combat and take the medicine just to save some children. And, once he was defeated, he deliberately tried to ensure that Balto and the whole team of dogs got lost and died, while he could return home and pretend to be a heroic survivor. Good lord, he got off WAY too easy in the end. In short, a true douchebag who was willing to let many people die (dogs and humans) just because his ego was damaged a little bit. No wonder he lost all his fans at the end.
General Draconis. From his death camps on Venus, starving the populace, to being personally responsible for Nara's parents deaths. Genocide, betrayal, nothing is too much for him. He even betrayed Phaeton when he was relatively sane, and was about to kill Thrax, an honorable Neosapien Warrior who wouldn't kill civilians.*
The incident with Thrax deserves an explanation. Thrax was a disgrace because he had spared a member of Exosquad after beating him fair and square. Draconis gave Thrax the chance to "redeem" himself by ordering him to activate a huge bomb in the heart of a city full of civilians. At the last moment Thrax destroyed the activation key and returned, claiming that the humans had disarmed it before the countdown had finished. What Draconis didn't tell Thrax was that the bomb didn't have a countdown; if Thrax had used the activation key it would have blown up immediately and killed him. That's how Draconis knew Thrax had disobeyed his orders — he came back alive.
Draconis is so bad that even Phaeton, who is based on Hitler, doesn't seem as bad at first. Of course, Phaeton eventually surpasses Draconis' evil after going insane from Automutation Syndrome.
The psychotic kid in the Lord of the Flies situation (an Exoscout Squad that lost their supervising adult) named Pirate from episode 24. Outright tries to murderRita Torres after she challenges his authority and beats him in single combat.
Dr. Albrecht Ketzer. Turned an entire village of natives in the Amazon and himself into half-plant monstrosities, turned Medusa into a half-plant/half-Neo-Sapien freak, and injected Nara Burns with the same serum. He views her only as an experiment, and wanted to kill all the humans AND Neo-Sapiens in the nearby city. Sadly, because the show ended on a Cliff Hanger, he became a Karma Houdini.
Soto from Ice Age. Let's see, he causes the death of Roshan's mother and widowed his father all for the sake of making Runar suffer his same angst over his own loss, he is heavily implied to be setting up Diego, his own second-in-command for slaughter by making him go off on a wild goose chase after a baby who rationally must be dead, and he has no real Freudian Excuse besides his unholy desire for revenge that he will stop at nothing and no one to see it finalized.
Going a bit further, when he told Cutter that a termite colony, one that was at peace with the ants for years, supposedly mobilized against their ant colony, Mandible immediately recommends sending troops, loyal to the queen, to attack the termite colony head-on; Cutter called it suicide, Mandible replied with "Exactly". Furthermore, Mandible seemed quite irritated when it turned out that there was one surviving soldier from the battle. When the Queen considered sending in an ambassador to renegotiate another treaty, Mandible claimed that "Every ant in this colony is precious to me", reminding her that they needed to attack while they still had the element of surprise, otherwise they'd face genocide by termite shock troops. When this persuaded the Queen to reluctantly approve of sending soldiers to attack, Mandible ominously replies with "You've ensured the future of this colony". Based on that whole exchange, it's implied that Mandible intended to kill off every part of the ant army that wasn't loyal to him in a suicide run, and may have even lied about the termites mobilizing against the ants to avoid suspicion.
Gallaxhar, the alien villain in Monsters vs. Aliens. Humourous sarcasm and hamminess aside, this guy lets his obsession with obtaining Quantonium drive him to unleash a huge robot on San Francisco, which probably would have endangered everyone there had they not already been evacuated. Upon learning that the Quantonium is within Susan, he has no qualms about almost killing Insectosaurus to get her and forcibly drain it out. All this to fuel a machine that creates an army of clones of himself in order to wipe out most of humanity and enslave those left as lab rats. His motive? To rebuild himself a new homeworld, because he himself destroyed his original one and everyone on it. His barely-revealed backstory hints that he has a Freudian Excuse or two, but it's strongly indicated that they are too poor to excuse his actions in any way. By the end, you can be sure he thoroughly deserves getting blown up with the rest of his ship.
Rumpelstiltskin from Shrek Forever After. Unlike the other villains, he is a stop-at-nothing psychopath who kills one of his mooks for no reason, and is implied to be responsible for hundreds of deaths. Additionally, there is his Ogre Genocide scheme
Hexxus, the Eldritch Abomination from FernGully. Most villains in kids' movies want to take over a kingdom, avenge an old slight, steal the girl, or simply enrich themselves. Hexxus wants to wipe out everything green on Earth. Just for Fun. Even the fact that he's voiced by Tim Curry doesn't stop him from being an utterly loathsome character - in fact, it probably helps, as Curry is at his evil best. Not to mention that Hexxus is quite possibly one of the biggest doses of horror ever delivered by a cartoon villain.
Animalia: TheCreeper is probably the nastiestweasel to ever exist in fiction. Trying to start a war in Animalia, attempting to kidnap Echo, tricking Alex, Zoe, Livingston and Fuschia into almost being blown away to their deaths by the wind of no return are but a few of the things he's done.
Lord Barkis Bittern in Corpse Bride. He appears to be a worst monster than Oogie Boogie. At first, he is respected by everyone, until the end has revealed his true personality: he only marries women in order to get their money for himself, killing them afterwards. If that wasn't enough, Barkis was the one who murdered the titular character, Emily (in her case, he tricked her into waiting for him with a box of jewelry that was her dowry, then murdered the girl and took said small fortune before running away), and he was also eager to do the same thing to Victoria once her Perfectly Arranged Marriage to Victor was annuled. This causes the living and the dead to "have shock on their faces". While Oogie has death as his ending, Barkis has a Fate Worse than Death, after becoming one of the dead, an angry mod descends upon him.
On the top of that, he is responsible for the Woobieness the three lead characters have.
Thrax from Osmosis Jones, considering the fact he really wants to kill Frank so that he'll be known to the medical books. Oh, and did I forgot to mention that he really did other kills before getting to him? That is one irredeemable virus. If that's not enough, at the very end, he brags to Osmosis that he's going to beat his record by killing Frank's daughter Shanie even faster.
HIM from We Are the Strange. In his very first scene, he physically assaults his girlfriend and throws her against a wall. In the same scene, he shoos her away, ordering her not to come back until she looks as beautiful as the models on his "girly posters" and tells her how ugly she looks wherever she smiles or talks. Then, later in the film, when he reappears and faces off against one of the heroes he brags about how he had just killed said hero's little boy moments ago. The fact that he might have a Freudian Excuse does nothing to diminish his CM status and the fact that some of his behavior is based off of a real person that the director had the misfortune of knowing makes his CM status that much more disturbing.
The 1971 Soviet film Pioneer's Violin features a Nazi soldier who chases and shoots at a small child around a bombed-out city in a tank while joyfully playing a German folk-song on his harmonica. Propaganda, but still quite chilling.
The Secret Of NIMH brings us Jenner, a power-hungry rat who would rather stay in the rosebush than move on to better life in Thorn Valley with the other rats of NIMH. Not only does he kill Nicodemus by cutting the ropes and seeing to it that he is crushed under the weight of a pulley and make it look like an accident just to steal the leadership of the rats away from him, he even threatens to kill Mrs. Brisby to take the amulet originally owned by Nicodemus himself from her for himself. Some cruel rat, huh?
The spider from Cobweb Hotel. His introduction says all — he runs an Hell Hotel for flies where he traps his guests for consumption. Althought seems like he does that for hunger, it's quite obvious they also does it for the fun to see their bug victims suffer (it's also implied he's tortured'em first). For more evil extra, during his opening Villain Song, where he gives a good pubblicity to his Hotel, we get an image of the poor buggies victims tied on the hotel bed made up of the spider's webbing who frantically struggle to free themselves and squeal desperatly. For the newwed Mr Fly, probably the only one who dares to fight him, the spider has a special treatment: he uses a paper clip to tie his wings and then proceed to unceasingly beat him with his other hands and feet. Luckilly at the end he got a The Dog Bites Back punishment by his would-be victims.
Lawyer Goodwill from Warner Bros. short "The Case of the Stuttering Pig. He at first presents himself gentle and kindly towards Porky Pig and his brothers. But then he reveals his true colors when he intends to kill them all in order to obtain their rich uncle's fortune. So he transforms himself with a formula into a psychotic, hideous Mr Hyde - like monster and tries to get'em all. In his monster form he evolves from a Smug Snake into a terrifying Large Ham who wants to kill all the pigs basically For the Evulz. He also frequently warns the audience in a creepy and harsh manner they can't help his victims. When he kidnaps some of Porky's bros he also sadistically explains how he intends to kill'em doing the throat-slitting gesture. Luckily he gets defeated by the guy in the third row he used to keep insulting.
South Park: Eric Cartman. In a show where both Satan and Saddam Hussein are characters and Satan is the lesser of evils, the character most likely to be a Complete Monster is Eric Cartman. Just look at the woodland critters he created; they gang rape Kurt Russell, advocate killing Strawberry Shortcake by having a guy with AIDS piss in her eye socket, worship Satan, are implied to be the most evil things ever imagined, commit a blood orgy with Rabbitie's corspe, and are so repulsive that even Jason Voorhees is terrified of them. To quote Jason, "Man I don't want to meet the kid who dreamed those things up."
He killed Scott Tennorman's parents, ground them into chili and fed it to him, all because Scott bamboozled sixteen dollars and twelve cents from him. When Scott tells Cartman that Scott's dad was Cartman's dad as well!. However, he ignores the fact that he killed his own dad and made his half-brother eat him because of the fact that his dad was a ginger.
While many of his deeds are more mildly evil, (like pretending to be retarded to get into the Special Olympics) after that point he's literally turned into the show's main antagonist, albeit one who occasionally helps the protagonists out.
He also infected Kyle with HIV because Kyle laughed at him (Kyle thought of it as karmic retribution due to Cartman's torment of him and threats to give Kyle AIDS). He's pretty much Adebisi as a fat white kid, or Porky Minch.
Although much of the fanbase sees him as more so as primarily Evilly Affable, despite his numerous atrocities such as being responsible for the deaths of many people (including his "friend" Kenny at least once) and attempting genocide twice. Whether you see him as Evilly Affable or a Complete Monster really depends on how far you think you can take Dead Baby Comedy.
Goes Beyond the Impossible in the latest Coon Trilogy. Allies himself with Cthulhu after his friends kick him out of Coon'n'Friends for being, you know, evil, goes on a massive massacre rampage with Cthulhu, destroying synagogues and killing thousands of Jews in the process, destroying San Francisco, ordering Cthulhu to send his friends to another dimension since he thinks they're 'evil', destroying Whole Foods and everyone who works there, and finally massacring everyone and everything in Burning Man. In the end, he's imprisoned and forced to eat poop, and some think that's getting off to lightly!
Lord Shen, the evil Peacock Emperor from Kung Fu Panda 2. He crosses the Moral Event Horizon in the backstory, murdering an entire village full of peaceful civilians in an attempt to eradicate the species prophesied to defeat him. He's basically Judge Claude Frollo with tail feathers, and he only gets worse from there. By the time he murders his own second-in-command for refusing to fire on his own people, he's become arguably the most monstrous villain to ever appear in a Dreamworks film. Unlike TaiLung from the first movie, he is completely devoid of any redeeming characteristics. Unless you go by the official site's All There in the Manual, in which he does have a somewhat redeeming backstory (that also explains some of his canon acts).
Red from All Dogs Go To Heaven 2. He manipulates Charlie into giving him Gabriel's Horn, he has Carface kidnap David (an eight-year-old boy!) to force Charlie to hand the horn over directly, tries to kill Charlie and all the other protagonists. And his ultimate goal? Use Gabriel's Horn to suck every dog out of Heaven and trap them in Alcatraz Island. Then drag the whole island with all the dogs in it down to Hell for all eternity! All of it just for the sake of being evil! What's worse? Remember what Carface was like in the original film? Red considers that small time compared to him!
Belladonna from the TV series counts as well. In all but one of her appearances, she tries to get Charlie to work for her through temptation and manipulation. When Itchy tried to get Charlie to turn back after he actually fell for her tricks once, she tried to send him into a meat grinder! Worse than that, she tried to force Charlie to be the one to do it! When her minions Carface and Killer were stuck in an Alternate Dimension inside a board game, she didn't give a crap, which she caused! And that one time Belladonna wasn't after Charlie? She wanted to ruin thousands of people's lives and probably indirectly send just as many dogs to the pound by sabotaging Christmas through said dogs, which she was probably counting on (the sadistic glee she displays while doing all of this makes it worse then it sounds)! And she tries to kill Carface and Killer in her One-Winged Angel form after their Heel Face Turn. And if it weren't for said Heel Face Turn, then her actions would have condeemed Carface to Hell. And like Red before her, Belladonna did all of the above mentioned things simply because she could! Well, that and get one over on her "goodie goodie cousin" Annabelle.
Belladonna's actions in the last example would have directly lead to the death of the Tiny Tim analog, something that she may have actually known, given her supernatural nature. Also the younger residents of Heaven know her as "the Boogeydog", makes you wonder what she did to earn that moniker!
The Changeling Queen, Chrysalis from My Little Pony: Friendship is Magic. She's the only antagonist who went so far as to try to kill other ponies. She disguises herself as Shining Armor's bride Cadence; just to harness his love for her as energy for her Changeling invasion of Canterlot; and imprisons the actual Cadence in the caves beneath Canterlot that most ponies had forgotten even exist. When Shining Armor's sister Twilight, having seen fake Cadence casting spells on Shining Armor, voices her own suspicions, fake Cadence plays innocent and makes it look like Twilight's only accusing her out of possessiveness of her brother. Fake Cadence then imprisons Twilight in the caves beneath Canterlot, away from the actual Cadence hoping neither will find the other. In her Villain Song's reprise, she observes her minions trashing Canterlot and hunting down all the ponies, and notes that this is sort of day which she has dreamed of since she was a child, bragging that she was an Enfante Terrible once upon a time.
