Agatha Harkness has been mainly shown by her alias, Agnes. Her quirkiness and humor granted her the main comedic role in the sitcom reality. She is often seen making jokes and comments for comedic relief. Once she is revealed as the witch Agatha Harkness, her demeanor becomes more sinister, though her personality for the most part seems to be similar to Agnes'. She is shown to be envious of Wanda Maximoff's raw magical potential and views Maximoff with contempt for squandering her magic on maintaining the fantasy within the Hex, believing that she is undeserving of her abilities.
Throughout their confrontation, Harkness criticizes Maximoff's less than heroic actions, such as her time in HYDRA and her imprisonment and torment of the citizens of Westview, further attempts to plant more seeds of doubt in her. Harkness is also arrogant, mocking Maximoff throughout their battle in Westview when she believes she has the upper hand; this turns out to be her undoing, as she unwittingly gives Maximoff the idea to use her original protection spell against her.
Despite her negative persona and hunger for power, Harkness possesses a sense of justice within herself, as shown when she was able to tell Maximoff's deeds weren't great for the state of reality across the universe. Despite her sense of justice, Harkness had no problem with deceiving people to achieve her goals, lying to Wanda that she would correct the flaws of the Westview anomaly in exchange for Wanda's magic. Nevertheless, Harkness was heavily obsessed with power, and would not hesitate to become the most powerful sorceress, resorting to dark magic to achieve it. Harkness values her magical knowledge and prowess greatly, being upset when Maximoff drained her of her magic and horrified when she learns Maxiooff intends to punish her by condemning her to an ordinary life in Westview as Agnes.
After being freed from Maximoff's spell, Harkness became frustrated after figuring out that she had spent three years trapped in Westview. She became even more infuriated after discovering that the magic she had spent centuries harnessing had been taken from her. When the teen attempted to convince her to walk the Witches' Road, she initially brushed it off but soon warmed up to the idea, knowing it would bring her magic back. Despite initially pushing him away and maintaining her usual demeanor, Harkness grew to care greatly for the teen. Upon discovering that the wine was laced with Alewife's Revenge, Harkness immediately stopped the teen when he proposed to drink the wine instead, and once he nearly died, Harkness began to cry and seemed visibly afraid of losing him. Rio implied that Harkness viewed the teen as something akin to a son.
About me: Agatha Harkness was a witch from Salem, Massachusetts, who was accused of practicing dark magic by her own coven during the Salem witch trials. She later gave birth to her son Nicholas Scratch, who was born sick and frail, and initially lived a quiet life with him, killing witches every once in a while to steal their powers, until he died from his illnesses. Having created the tale of the Witches' Road with Nicholas prior to his death, Harkness was approached by numerous witches who sought the Road and tricked them into joining her in a coven only to later provoke them into attacking her to steal their powers, repeating this for many centuries.
Over three hundred years later, she sensed the presence of chaos magic radiating from the Westview Anomaly created by Wanda Maximoff. Unfazed by her thrall over the population of Westview, Harkness became obsessed with harnessing Wanda's magic. Living under the pretense of the WandaVision sitcom, she stole Ralph Bohner's house and undertook the guise of Agnes, Wanda's "nosy neighbor," all the while interfering with Wanda's idyllic paradise to her own benefit. Upon discovering that Wanda was the Scarlet Witch, Harkness was defeated and stripped of her magical abilities, indefinitely condemned to live out her life as Agnes O'Connor in Westview.
However, in 2026, two years after the death of the Scarlet Witch, the spell that had enthralled Harkness failed and was broken by a reincarnated Billy Maximoff who sought Harkness. Pursued by the Salem Seven, the vengeful children of the Salemites, Harkness assembled a coven with Billy, intending to trick them too, but was surprised when the door to the Road actually appeared. Harkness walked the Road with her coven in an attempt to regain her lost powers, coming into confrontation with the sins of her past and her former lover Rio Vidal. In reality, Vidal was the embodiment of Death and had joined the coven to claim Billy due to him upsetting the cosmic balance by reincarnating into a dead body. Realizing the error of her ways, she sacrificed herself to save Billy from Death but soon returned as a ghost and joined him in searching for his brother Tommy Maximoff.
Who I'd like to meet: Being a witch and a member of the Salemites, Agatha Harkness stole forbidden knowledge and secretly practiced dark magic, until she was caught by her coven. During the height of the Salem witch trials in 1693, Harkness was captured and dragged through the woods for a trial and bound to a wooden post. After Harkness reaffirmed that she was a witch, her mother, Evanora Harkness, stated that she had betrayed her coven, stolen knowledge above her place, and practiced the darkest of magic, which Harkness denied.
The witches tried to kill Harkness with energy beams as Harkness pleaded with Evanora. Harkness continued to cry until her powers took over and she reversed the effect of the beams onto the witches, killing them. Harkness broke free of the post and killed Evanora before taking the brooch off her mother's corpse and flying away.[
