Complete Monster/Arrowverse

Of the many characters populating the DC Arrowverse, here are the worst of the worst.

Arrow

 * Cecil Adams a.k.a The Count/Count Vertigo I debuting in season 1's "Vertigo" is a sadistic, sociopathic drug peddler who seeks to push on the streets a new drug known as Vertigo. To perfect Vertigo, the Count kidnaps people to be his test subjects and injects them with the drug to cause them excruciating agony. The Count then offers them a gun with one bullet: they can either shoot themselves to spare themselves the pain, or shoot him for revenge. The suicide rate, after nearly thirty victims, is one hundred percent. The Count views this as making Vertigo even better, comparing it to a wine ripened with age, and plans to flood the streets with Vertigo as a whole while using it as a weapon against both Oliver Queen and a minion of his who failed him. His next appearance, upon breaking out of prison in season 2's "State v. Queen," has him poisoning vaccines with Vertigo and having them distributed all throughout Starling City in order to blackmail its populace into buying more Vertigo to save themselves from dying due to withdrawal. And when he finds out that Oliver Queen is The Arrow, he kidnaps his close friend Felicity Smoak and attempts to murder her with an injection of Vertigo for the sake of hurting him. A deranged, hammy lunatic who revels in the suffering he spreads, The Count proved to be the first of many truly monstrous villains in the Arrowverse.
 * From season 2's "Broken Dolls," Barton Mathis, best known as The Dollmaker, is an Ax Crazy Serial Killer who preys on young, beautiful women. After kidnapping them, the Dollmaker kills the girls by suffocating them to death with a liquid polymer and preserves the corpses by injecting them with chemicals before dressing them up like giant dolls in a deranged bid to preserve their beauty. The Dollmaker has a particular grudge against Quentin Lance, the cop who put him away the first time, and after his escape from prison Mathis calls up Lance and forces him to listen as he kills another girl. Later, he kidnaps the man and takes sadistic glee in forcing Quentin to watch him try to kill his daughter Laurel purely out of spite towards him.
 * Khem-Adam from the official tie-in comic book series Arrow Season 2.5 is the leader of Onslaught, a group of fanatical, religious terrorists, who took advantage of the power vacuum in Kahndaq after the previous dictatorship was overthrown. His main goal is to force his country back into the old, barbaric ways, with women in particular being reduced to nothing more than serving the needs of the men. He crosses the Moral Event Horizon right in the very beginning, when he has a group of young women forcefully abducted for nothing more than undergoing school education (and after murdering their teacher right in front of their eyes). He is later shown to orchestrate mass executions on any one who dares to oppose his godly quest, and assigning the girls to his men as personal slaves to be beaten and raped. When one of the girls kills her abuser in self-defense and manages to escape, he immediately orders the rest of the group to be executed as an example. Misogynistic, cruel, and with a delusional fantasy of carrying out the will of the Old Gods, Khem-Adam earns the disgust of even the hardened criminal members of the Suicide Squad (one member in particular being a former military leader of the aforementioned overthrown dictatorship).
 * Werner Zytle proves to be a worthy successor after following the death of the original Count Vertigo, taking control of the drug and modifying it to make the user hallucinate their worst fears. He is introduced in season 3's premier "The Calm," forcing a fellow gang leader to take it before killing him and taking control of the other gangs in Starling City. He decides a reasonable way to attempt an assassination on Oliver Queen is by firing a rocket launcher into a restaurant full of people. He later tries to kill the remaining gang leaders of Starling City by blowing up the entire stadium they were in; the stadium contained around 20,000 people. In his next appearance in the same season's "Canaries," he escapes police custody with the help of a reporter whose family he threatened. He then forces said reporter to try to kill the Arrow via suicide bomb. He then takes several hostages in a drug lab, forces them to make more of the Vertigo drug, and when Team Arrow comes to the rescue, he attempts to burn his hostages alive.
 * General Matthew Shrieve, the main villain for the flashback sequences of season 3, initially appears as a reasonable and helpful military officer before being revealed as a callous extremist. Regarding China as an economic threat to the United States, Shrieve intends to use the Omega virus to destabilize the country, caring nothing for the lives that would be destroyed by his actions. After usurping Amanda Waller as the head of A.R.G.U.S., Shrieve sends a squad of soldiers after Oliver and the Yamashiros, including young Akio, to eliminate potential witnesses to his impending crimes. Unleashing the Omega virus on Hong Kong, causing thousands of infections and deaths, Shrieve causes the virus to spread even further by disguising injections of it as a vaccine. When Akio is infected, Oliver and Maseo confront Shrieve for a possible cure. After handing them a supposed cure, Shrieve reveals that it was only insulin for his diabetes, using this as a distraction in an attempt to kill them both. After Akio succumbs to the virus, Shrieve taunts his parents, cruelly laughing in their faces. Although the virus is ultimately prevented from spreading beyond Hong Kong, hundreds, if not thousands suffered its effects, something Shrieve shows no remorse for. Militant and xenophobic, Shrieve, despite his delusions of righteousness, is ultimately nothing more than a smug mass murderer devoid of conscience.
 * Lonnie "Anarky" Machin from season 4 is far worse than his comics counterpart. Once a mob enforcer, fired because his methods were too extreme, he is introduced to the audience as trying to ingratiate himself into H.I.V.E. by forcing Jessica Danforth to drop her candidancy for mayor. When his first attempt fails, he kills several policemen and kidnaps her daughter, to whom he gives a false sense of security before sadistically breaking her finger and promising to do much worse to her, before being intercepted by Team Arrow. During the ensuing confrontation, his face gets burned by Thea, which causes him to develope a creepy obsession towards her. After escaping imprisonment, Machin attempts to settle old scores, first killing his foster parents and then targeting H.I.V.E., in particular Damien Darhk, for not letting him join them. To get his revenge, he seizes Darhk's wife and daughter, again being stopped by Oliver and his friends narrowly before committing Cold-Blooded Torture. Finally, shortly before H.I.V.E.'s plan of global nuclear devastation comes to fruition, Machin invades Tevat Noah, where H.I.V.E. harbours several hundred people to survive the crisis, and promptly plans on destroying it. After getting confronted by Thea yet again, Machin kills her boyfriend Alex Davis right in front of her, dismissing him as a hindrance. Kidnapping Darhk's family a second time, Machin continues with his plan, causing Ruvé Darhk to try to appeal to him that he is essentially destroying the last safe place on earth, which just causes him to sarcastically ask her if he strikes her as a rational person and later murder her. Anarky has no greater goal or vision, he just kills because it amuses him and gives him a sick sense of satisfaction.
 * General Konstantin Kovar, the main villain of the flashback storyline of Season 5, is a member of the Russian government who rules over the village of Krasnoyarsk, and leader of a criminal organization. Planning to rule over the country, he attempts to stage a Coup by gassing the Russia's entire political and military leaderships to death. As Oliver Queen foiled his attempt and nearly killed him, Kovar returns to take vengeance on him. After capturing Oliver, he tortures him by injecting him a drug that causes him to relieve all of the physical, psychological and emotional pain he lived in the past five years. Kovar then offers him a gun, expecting him to be Driven to Suicide. When Oliver escapes his cell instead, Kovar tries to kill him. Ultimately defeated, he gloats that the island will forever remain his prison. Kovar's sophisticated and polite façade only serves to hide the ruthless, power hungry and sadistic monster he truly is.

The Flash

 * Zoom, real name Hunter Zolomon, is a sociopathic speedster from Earth-2 and the Big Bad of Season 2. Originally a Serial Killer with 23 victims to his name, after getting Super Speed, Zoom reveled in terrorizing Central City alongside a gang of dangerous metahumans. Left dying from abusing the Velocity drug, Zoom kidnaps Jay Garrick, the Flash of Earth-3, hoping to steal his speed to save his own life. When this fails, Zoom steals Jay's identity, acting as the Flash to create hope for the sake of destroying it as Zoom, imprisoning the real Jay as a trophy. When the breaches to Earth-1 opened, Zoom plotted to force Barry Allen to become faster in order to steal his speed. Sending metahumans with orders to kill the Flash, Zoom also posed as Jay to earn Barry's trust. Over the course of the season, Zoom murders dozens of people, innocents, police, and his own minions alike while. Confronting the Flash for the first time as Zoom, he brutally beats Barry, fractures his spine, and displays his broken body to all of Central City. Zoom also holds Harry Wells' daughter Jesse hostage, using her to try and coerce Harry into stealing the Flash's speed for him. After being cured of his condition, Zoom decides to terrorize Earth-1, unleashing an army of metahumans on Central City. When his army is defeated by the Flash, Zoom kidnaps Barry's father Henry, then forces Barry to watch as he murders him. As his endgame, Zoom intends to use a doomsday device to destroy the entire multiverse, sparing only Earth-1 to keep as his personal domain. And in order to power it, he forces Barry to race him and generate the energy needed in the process on threat of murdering his adopted father Joe West as well as the rest of Team Flash. A brutal, sadistic maniac devoid of remorse, Zoom is a terrifying monster that darkens every scene in which he appears.
 * The Trickster, real name James Jesse (and played by Mark Hamill), is a bloodthirsty terrorist with a flair for the dramatic and the personality of a deranged child. After a killing spree that landed him in prison, the Trickster is introduced by breaking free from prison with the help of his son Axel, who he manipulated and groomed into becoming as dangerous a psychopath as him. With his help, the Trickster takes Henry Allen hostage and tries to have him impaled with knives while also poisoning the guests at a party so he can blackmail them into giving him money, with one guest dying as a demonstration. During his second appearance, the Trickster uncaringly abandons Axel and teams up with Mark Mardon/Weather Wizard for a chance to kill the Flash. And to do so, he disguises himself as a mall Santa and distributes over a hundred gift-disguised bombs to children, and forces the Flash to let Mardon torture him to death on threat of detonating the bombs and killing the children and their families.

Legends of Tomorrow

 * Vandal Savage, originally known as Hath-Set, is an immortal tyrant bent on world domination and the Big Bad for Season 1. Starting out as an obsessive Stalker with a Crush to Chay-ara, the future Hawkgirl, Hath-Set murdered her and her lover Prince Khufu, the future Hawkman, when he discovered their relationship. After becoming immortal, he repeated this crime in each of their reincarnations, often resorting to extreme methods to do so, such as triggering a destructive flood, killing millions, and threatening to lay waste to Central City. Over the millennia, Savage has manipulated and worked with a number of historical figures, including Adolf Hitler and Josef Stalin, to help further his goals. In his campaign for world domination, Savage commits a number of terrible crimes, including horrifying human experimentation in attempts to replicate Hawkman and Firestorm's powers, selling a nuclear warhead to terrorist groups, and leading a cult that worships him as a god. Acting as an Evil Mentor to Per Degaton in the 22nd century, Savage manipulates him into murdering his own father, then releases a biological weapon to decimate the world's population. Savage later betrays and murders Degaton, using his resources to Take Over the World. Conquering Earth by 2166, Savage causes billions of deaths, uses a giant robot as a Weapon of Mass Destruction and personally murders Rip Hunter's wife and son, endlessly taunting Rip over this as they encounter each other throughout history. In the end, Savage attempts to cause a temporal paradox that will reset history back to Ancient Egypt, where he plans to start his war of conquest all over again.
 * Oddly enough, Vandal actually loses his Complete Monstrosity after his own death, once his soul has been damned to Hell for eternity. Throughout his years in Hell, he mellows out, ceases to desire revenge or power, and even begins to forget what his reasons for fighting the Legends even were to begin. He befriends the soul of Roy Harper when charged with tormenting him, leading to him officially ending his rivalry with the Legends. Though incapable of changing or finding any redemption in life, it takes being dead for many years for Vandal's soul to evolve and effectively change him into a much different man than he'd been when he left the world of the living.

Supergirl

 * Brainiac 8, known better as Indigo, is a Coluan imprisoned on Krypton for attempting to destroy the Kryptonian people. When she introduces herself on earth, she turns every light in National City green, causing accidents and endangering hundreds of lives. Soon revealing her darker side, Indigo tries to launch nuclear missiles to destroy National City, planning to Kill All Humans. When defeated, she later teams up with Kara's Evil Uncle Non and activates Project Myriad to put humanity into a trance-like state. Indigo then puts her plan a step further into motion: to enhance the power to kill everyone else on earth and then leave the planet, leaving Kara stranded as "queen of a dead world." Even in her last moments, Indigo gloats that she had left Project Myriad impossible to stop, taking comfort that humanity will follow her to the grave.
 * Roulette, real name Veronica Sinclair, is a ringmaster who organized an underground Fight Club in National City, commanding aliens to death for money to entertain rich people, including herself. When J'onn and M'gann refuse to fight, Roulette releases Draaga to try to kill them both, but gets arrested. Upon being freed due to her connections, Roulette, with the help of an alien doctor, plans to sell humans in a slave market on Maaldoria in exchange for a large amount of diamonds. Utterly apathetic to aliens and human beings alike, Roulette is a Rich Bitch who has no qualms against making quick money at the expense of others.
 * Rhea is the queen of Daxam, wife of Lar Gand and mother of Mon-El. After escaping Daxam's disaster, Rhea and Lar Gand find Mon-El on Earth and try to get him to join them. When he refused, Rhea blames Kara for it and tries to get her killed by issuing a bounty against her, then tries to kill her herself. Once Lar Gand decides to let Mon-El stay on Earth, Rhea accuses him of "betraying" her and murders him. Returning on Earth, Rhea manipulates Lena Luthor into creating a transmatter portal for her forces to come, and starts an invasion to take over the planet and reduce humanity into slavery. To forge a connection with humans, Rhea forces Mon-El and Lena to get married by threatening to destroy a hospital full of children, stating they could rot in a cell for all she cares afterwards. Challenged by Kara in a trial of fight, Rhea doesn't honor their agreement when she loses and orders her forces to destroy National City, then tells Kara that she will destroy city after city until her whole world is gone. A petty, self-centered individual as well as a horrible mother, Rhea's inability to accept any responsibility for her actions is what makes her a monster.

Vixen

 * Benatu Eshu is a ruthless Zambesi warlord and season 2's Big Bad. Desiring the Totems of Zambesi, Eshu led a raid on Mari's village when she was an infant, massacring scores of innocents, upon learning that the village possessed the Anansi Amulet; among those killed was Mari's father, who Eshu callously executed when he attempted to stand against the madman. In the present, Eshu arrives in Detroit under the guise of an ambassador and continues his quests to find the totems. To achieve his goals, Eshu bribes a thief into stealing the Fire Totem for him, then promptly kills the man once he's no longer of any use. With the Fire Totem in his possession, Eshu attempts to kill Mari to steal the Anansi Amulet. Failing in this, Eshu goes on a city-wide rampage in a fit of homicidal rage, burning down a massive portion of Detroit in an effort to draw Mari out. When Mari and her allies attempt to stop him, Eshu incinerates Mari's sister Kuasa right before her eyes before trying to kill Mari herself. Even when he is stripped of the power of the Fire Totem, Eshu continues his attempt to murder Mari in order to steal her amulet and harness its powers for his own purposes.

Constantine

 * Jacob Shaw, from "A Whole World Out There", is a demented Serial Killer who evaded punishment after getting caught by transferring his mind from his body to a Pocket Dimension found during his occult studies, where he essentially became a god-like Reality Warper, able to live out his sick fantasies as much as he wanted. When a group of teenagers accidentally trespasses into his realm, he takes this as an opportunity to live out his sadistic pleasure even more. He starts hunting the teenagers in the real world by appearing on reflective surfaces, driving them nearly insane, and then brutally killing 3 out of 4 via impaling, dismembering with a knife and suffocation. Afterwards, he keeps the souls of the deceased in his realm, where he keeps on torturing them and tells them that they will experience a never-ending circle of getting hunted down and killed by him, all just because he enjoys it.
 * "The Man", from "Waiting for the Man", is introduced as a Satanic redneck who abducted three little girls. Said girls are almost mindlessly devoted to him; how that happened is not made clear, but it involves getting married to him, with a collar and bruise marks around each girl's necks. He sends them off to find another bride for him, and while waiting for them to return he brutally tortures and murders a bypassing, helpful man in a ritualistic way, for seemingly no other reason than being near him at the wrong time. Later, it is revealed that "The Man" murdered his real wife six years ago as a sacrifice for Satan and when John gets to his lair, he finds the aforementioned three girls murdered in bed, with the fourth girl only surviving because she ran away and was saved by John's crew in the nick of time. "The Man" is such a despicable individual that John and Jim Corrigan decide to outright murder him instead of just having him face the law. What worse is that, unlike magic-empowered villains like Jacob Shaw, "The Man" is, aside from being a Satanist, completely normal.