Michael Langdon

 Michael Langdon  is the sinister offspring of a human and a ghost (Vivien Harmon and Tate Langdon), considered to be the bringer of the End of Days. He is a character in American Horror Story portrayed by Cody Fern.

Background
Michael was first conceived when Tate, dressed as the Rubber Man, raped Vivien Harmon, who she believed to be her husband, Ben. Psychic-medium Billie Dean Howard believed that a child born under these circumstances would be the Anti-Christ, and would be destined to bring about the End of Days. [2]

During Vivien's first ultrasound, the attending nurse fainted in horror at the sight of the then-unborn Michael in-utero, and quit her job immediately afterword; the ultrasound machine, mysteriously, broke moments after this. Later, Vivien had a nightmare of a tiny clawed hand attempting to rip through her pregnant stomach, and soon after began to develop a taste for raw organs, consuming the liver and uncooked brain of a cow. Vivien was eventually able to contact the nurse from her failed ultrasound, who hesitantly agreed to meet her in a church, telling in her it was the only place where she "[felt] safe". She confided in Vivien that what she witnessed in her womb plagued her with nightmares and turned her into a believer in God, and, recalling what she witnessed during the ultrasound, whispered quietly to herself "...the hoofed feet". Vivien, thinking the woman to be mad, headed out the cathedral doors in frustration, while the nurse began to fervently recite quotes from the Bible, her face plastered with a look of dread.

Appearance
Long before his preternatural birth, Michael gave every indication that he would be the personification of the most unimaginable evil to walk the Earth, prophesied by the Book of Revelations to conquer human life and unavoidably bring about the destruction of all of which does, and could, exist. From the moment of his conception - though only a rudiment in his mother's womb - he was a devourer of innocence: he fed off the nutrients of his twin brotherto deprive him of a chance at life, and consumed the raw flesh of cattle to sustain himself in his mother's body before trading her life away, stealing her last breath during a violent and agonizing nativity that would only ensure his own successful emergence upon the world. [5] Even as a child, his very existence was a disturbing subversion of innocence, and he proved this at just six years of age, when he sliced open his nanny's neck to create frivolous handprints with her blood, giggling in the presence of his grandmother when she discovered the body.

Story
Vivien gives birth to him and his twin brother Jeffrey, who is stillborn. Michael is quickly snagged by Constance, and she and Moira admire him while washing off the placenta. This is interrupted by the ghost of Hayden who, angered by the loss of her own child due to being murdered, states that Michael will be her own baby and steals him. Hayden enlists the help of the ghosts of Dallas and Fiona to kill Ben before he can leave the Murder House for good, thereby preventing him from leaving with the baby; with all of the Harmon family now dead, she takes Michael for herself. Thanks to Travis incapacitating Hayden, Constance takes her grandson back and "adopts" him, moving to New York not long afterward.

Sometime later, Constance comes home to find Michael sitting on a rocking chair in his room. The child, impressively already a toddler, smiles at his grandmother with blood on his face; he has murdered his nanny.