Aubrey Plaza's character in Agatha All Along has caught the attention of Marvel fans due to several intriguing scenes that suggest she could be tied to one of the MCU's most powerful villains. Plaza, who plays Rio Vidal, has sparked speculation that her character is linked to the demonic entity Mephisto, a notorious figure in the Marvel universe.
A Mysterious Debut
In Agatha All Along, Plaza portrays Green Witch Rio Vidal, a character whose connection to Agatha Harkness (Kathryn Hahn) is shrouded in mystery. While Plaza has confirmed that more details about her character will be revealed later in the series, fans are already making strong assumptions after watching the first two episodes of the WandaVision spinoff.
During the premiere episode, Rio confronts Agatha in a tense exchange, where she ominously threatens, "After all these centuries, Agatha Harkness will finally meet her end." Agatha responds, unfazed, to which Rio delivers a chilling reply: "Yes, I do. It’s black, and it beats for you." This dark and enigmatic interaction, combined with another scene involving a mysterious black heart, has led many viewers to speculate that Plaza's character could be none other than Blackheart, the son of Mephisto.
Clues Pointing to Blackheart
In a key scene from the second episode, Agatha and Teen (Joe Locke) visit a seer named Lilia Calderu, who predicts the members of Agatha’s future coven. Lilia identifies Agatha, Jennifer Kale (Sasheer Zamata), and Alice Wu (Ali Ahn), but when attempting to reveal the name of the fourth coven member, she instead draws a black heart. Agatha’s reaction suggests she knows exactly who this mysterious individual is.
Fans believe this black heart symbol is a major clue, linking Rio to Blackheart. Blackheart is known in the Marvel comics as the son of Mephisto, and speculation is growing that the MCU may have gender-swapped the character for the show. This wouldn’t be the first time such a creative decision has been made, as gender-swapping characters has become more common in modern adaptations. Notably, the animated series Batman: Caped Crusader also made The Penguin female.