Complete Monster/American Horror Story

"Man: As long as there is a God, men like you can kill thousands. Millions. But you won't ever find peace. James Patrick March: (laughs) Well, then, I guess I'm just going to have to kill God. That is my message to the world. (smacks the man in the back of the head with his hammer, killing him) —Hotel, "Chutes and Ladders""

"Man: As long as there is a God, men like you can kill thousands. Millions. But you won't ever find peace. James Patrick March: (laughs) Well, then, I guess I'm just going to have to kill God. That is my message to the world. (smacks the man in the back of the head with his hammer, killing him) —Hotel, "Chutes and Ladders""

While American Horror Story is an incredibly dark anthology series filled with rapists, psychopaths, and murderers, there are still some characters who manage to go above and beyond the rest. These are the most vile, disgusting villains that this already twisted series has to offer.

Franchise-wide

 * Satan himself is the Greater-Scope Villain of the American Horror Story universe. As the orchestrator of several tragic events throughout the anthology, Satan directly assisted the perpetrator of the Night Stalkers murders that started in 1984, Richard Ramirez, granting him immortality and breaking him out of San Quentin State Prison to take more lives. Arriving at Briarcliff Asylum through Jed Potter, Satan possesses the young and innocent Sister Mary Eunice, driving her to lewd behavior and trapping her in perpetual agony. Inside Mary's body, Satan personally murders people; helps a Nazi war criminal with his unethical experiments on inmates; inspires a budding psychopath who proceeded to kill her entire family; and unleashes a mass murderer on Sister Jude. When Jude is stripped of her position, Satan tortures her to the point where her reflexes are severely impaired and later rapes Monsignor Timothy Howard solely to debase him and mock his vows of celibacy, intending on rising to the top of the Catholic Church and destroy it from the inside. Using the ghost of Tate Langdon as a conduit at the Murder House to give birth to The Antichrist via rape, Satan watches from behind the scenes as his son kickstarts the Apocalypse in his name with a nuclear holocaust.

Asylum

 * The friendly-seeming is the true identity of the original Bloody Face. To deal with his own Parental Abandonment, Bloody Face kidnaps women whose skin he thinks feels like his mother's, killing and skinning those whose skin fails his macabre test to make masks or furniture. As Dr. Thredson, he is tasked with evaluating a man accused of the Bloody Face murders, which he takes advantage of by convincing the man to confess. Tricking protagonist Lana Winters into trusting him, Bloody Face lures her from the insane asylum to his house, where he reveals that he has murdered her girlfriend and kept the corpse on ice. Tormenting Lana, Bloody Face tries to get her to become intimate with the corpse and then rapes her when she tries to flee. Willing to kill Lana even after she has become pregnant with his child, Bloody Face smugly states his intent to get away with his crimes using the insanity defense.

Freak Show

 * Dandy Mott is a spoiled heir who exhibited signs of sociopathy even in childhood, and is heavily implied to have caused another boy's disappearance. As an adult, he has become bored with his lavish lifestyle. This is alleviated when he meets Twisty, a Serial Killer who has kidnapped several young children, whom Dandy is shown gleefully tormenting psychologically. Dandy later becomes a killer himself, after being introduced to "the sweet language of murder". Two of his many victims are another childhood friend and his own mother, the latter of whom he turns into a giant Dead Woman Puppet after bathing in her blood. While he asserts that he identifies with the freaks, he talks down to them and uses the term "freak" to insult them, even after correcting his Dragon for doing the same thing. After they get fed up with his mistreatment, they walk out on their contracts, so Dandy calmly strolls around their campgrounds and shoots them dead as he sees them. Despite his claims of being in love with the Tattler twins, he treats them like possessions rather than human beings, and it's quite obvious that whatever "love" he feels for them is purely narcissistic. Though he presents himself as a cultured aristocrat, Dandy is ultimately just an overgrown child who never quite grew out of the mentality that everyone and everything exists solely to entertain him and bend to his will.
 * Stanley wants to kill the freaks just so he can make money off selling their bodies to a museum. Posing as a talent scout to lure Maggie into becoming his apprentice, Stanley attempts to manipulate her into killing Jimmy for him, admitting he would kill her too if her body could be sold. Constantly dreaming of killing the freaks and the money he will make off the freaks' bodies, Stanley tries to poison Bette and Dot with cupcakes, and when he sees Dell at a gay bar, blackmails Dell into killing Ma Petite for him, taunting him about the guilt he feels. When Jimmy gets arrested, Stanley convinces Jimmy to let him saw off one of his deformed hands and sell it to get Jimmy a lawyer, only for Stanley to cut off both his hands and keep all the money from selling them to himself, leaving Jimmy imprisoned. When Maggie tells the freaks of Stanley's intention, the latter, greedy and self-serving to the end, cowardly tries to save his own life, outing Elsa as Ethel's murderer to try and redirect their hatred.

Hotel

 * James Patrick March, the deceased first owner of the Hotel Cortez, is a wealthy Serial Killer who murdered countless people in life and continues to do so as a ghost. When he learned that his wife was still interested in her former lover, he had the man sealed up behind a wall in an abandoned wing of the hotel and left him there to die. He has also served as an Evil Mentor to some of history's most prolific Serial Killers, and is responsible for corrupting into becoming the Ten Commandments Killer. This is part of a project of his in order to "kill God," purely to spite a particularly defiant religious man he killed while alive. March is completely self-centered in his desire for the Countess, arranging her death so that she will be forced to spend eternity trapped in the hotel with him. Finally, March controls the equally monstrous Addiction Demon, a strange rapist creature with a drill for a penis whom March uses to threaten others into following his orders. A sadistic, brutal savage who hides his true nature beneath a veneer of class and aristocracy, March is the only member of a morally ambiguous cast without a single redeeming quality.

Roanoke

 * Scáthach is behind centuries of countless disappearances and murders in name of her Religion of Evil since before the Salem trials. A descendant of Druids from the British colonies, Scáthach is an avid worshipper of the Old Gods who pledged her alliance to them to avoid her execution at the stake, killing several soldiers and leaving the Native Americans to take the fall for the mass murder. Coming across Thomasin White after she had been exiled by insurgents of Roanoke and left to die, Scáthach saved her in exchange for her soul and corrupted Thomasin into her right-hand woman, The Butcher. After all the rebellious settlers were executed, Scáthach forced the colonists to follow in her religious ways by practicing Human Sacrifice, with not even children being safe; when a deserter stole from the colony, Scáthach scalped him and watched as Thomasin roasted him alive. Declaring the colonists to be "children in need of discipline" for wanting to stop the bloodshed, Scáthach proposed the idea to perform the ritual of the Blood Moon on the land to enslave their souls for all of eternity; after Thomasin poisoned her people, including Thomasin's own son, Scáthach slashed her throat to conclude the massacre. With the Lost Colony slaughtering anyone who comes near Roanoke in brutal ritualistic killings and adding their souls into their ranks as fresh slaves, Scáthach still oversees them to make sure that her sacrifices are carried out. During the events of My Roanoke Nightmare and Return to Roanoke, Scáthach distorts Matt Miller's mind to turn him into her Sex Slave and later influences his sister, Lee Harris, obtaining her soul to make her the new Butcher.

1984

 * Margaret Booth is a deranged camp counselor who gradually evolved into a Serial Killer. Upset over the various counselors who bullied her at Camp Redwood, Margaret tried to persuade Benjamin Richter into murdering them for her. When he refused, she killed them all herself and framed Benjamin for all the murders, which led to him being tortured inside of a mental institution for fourteen years. After Benjamin escapes and goes on a killing spree as Mr. Jingles, Margaret decides to murder the new employees at Camp Redwood so she can pin the blame on him again. When this fails, she frames Brooke Thompson instead, resulting in the latter spending five years in prison and seemingly being publicly executed. When Margaret becomes wealthy exploiting various massacre locations as tourist attractions, she decides to do the same for Camp Redwood by holding a musical festival there. After the members of Kajagoogoo are killed, and Margaret runs into Richard Ramirez and another serial killer inspired by Ramirez's murders, Margaret sanctions them to slaughter dozens of musicians and civilians at the festival just to thrive off the camp's subsequent infamy.
 * Richard Ramirez, also known as the Night Stalker, is Satan's own bloodthirsty Psycho for Hire. A violent Satanist wreaking havoc around Los Angeles, Ramirez nearly decapitated a woman and disembowelled a rude aerobics student to earn the heart of his teacher, Montana Duke, promising to kill Brooke Thompson for her. Following Brooke to Camp Redwood, Ramirez makes the sympathetic Benjamin Richter sell his soul to Satan to recruit him as an unwilling partner-in-crime, going back to Los Angeles and killing dozens of random innocents with no signs of stopping while Benjamin had to watch everything. After Benjamin finally exposes Ramirez and gets him arrested, Ramirez tries to corrupt Brooke in prison before escaping to get his revenge. Finding Benjamin's family in Alaska, Ramirez murders his wife and challenges Benjamin to return to Camp Redwood once more for the safety of his baby son, Bobby; at Camp Redwood, Ramirez slaughters the members of Kajagoogoo shortly after his arrival. Happy to assist Margaret Booth in her plans and serving as a "major inspiration" to another serial killer, Ramirez teams up with him to participate in a massacre, and when that fails, Ramirez tries to return to Alaska just to kill Bobby as his own twisted idea of a "final revenge".