Agatha All Along Just Gave The Biggest Hint To Rio’s Identity Yet

By Lewis Glazebrook

Published Oct 18, 2024

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Warning! This article contains spoilers for Agatha All Along episode 6.

WandaVision. The soul of Billy Maximoff then inhabited William's body, revealing how the character is now part of the journey down The Witches' Road.

Naturally, this episode featured many reveals about Billy and was mostly devoid of Agatha All Along episode 6 Easter egg offering the biggest clue to this mystery yet.

Agatha All Along Hints Billy Maximoff Was The Coven’s Green Witch

Billy Maximoff Was The Black Heart, Not Rio

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When Agatha All Along's witch coven was formed, Lilia Calderu wrote down three names and a symbol for the four other witches who were destined to Agatha and Billy Maximoff down The Witches' Road. This list included Lilia's own name, Jennifer Kale, and Alice Wu-Gulliver, with the symbol being a black heart. In the show, the characters first assumed the black heart symbolized the coven's green witch, referencing Mrs. Hart/Sharon Davis and then Rio Vidal after the former's death.

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It was a common theory from viewers that the black heart symbolized Rio based on her comment about having a black heart that beats for Agatha in episode 1. However, Agatha All Along episode 6 may have revealed that it was Billy who is the coven's green witch. In a text from his boyfriend, Billy is told "You're my heart," only with the word heart showing as a black heart emoji. This implies that Billy, originally thought of as a familiar and not an official member of the coven, is actually the green witch.

Agatha All Along episode 6 also revealed that Lilia was the one who placed the sigil on William Kaplan to hide the fact that he will eventually become Billy Maximoff from other witches. The show already confirmed that the sigil works on the witch who cast it, explaining why Lilia - an expert in divination and future sight - wrote a black heart for Billy rather than his name, which she was bewitched not to know by the sigil. If Billy is the black heart, this could confirm a Rio Vidal theory.

If Rio Vidal Isn’t The Green Witch, Who Is She?

The most common theory about Rio Vidal is that she is the MCU's version of Marvel Comics' Lady Death. This was hinted at several times in Agatha All Along's first six episodes. In Agatha All Along episode 4, Rio mentions that once Agatha kills the other witches, she gets their bodies. This coincided with Rio telling the coven that she once had to do her job which caused the pain of someone she loved. This was clearly in reference to her and Agatha, with the theory being that Nicholas Scratch's death saw Rio take him as Lady Death, upsetting Agatha.

In the same episode, Agatha begs Rio "Don't take him" when Teen is injured before stating to Agatha "That boy isn't yours," something she would only know for certain as Nicholas is dead. Rio's absence in Agatha All Along episode 6 also came after Alice's death, another hint that Rio is Lady Death. Finally, in Agatha All Along's midseason trailer, Rio can be heard stating "All roads lead to me." This could reference the fact that everyone dies eventually, leading them to Rio and reinforcing that - alongside Billy being the green witch - Agatha All Along includes the manifestation of Death itself.