Warning: SPOILERS for Doctor Strange in the Multiverse of Madness.
Doctor Strange in the Multiverse of Madness saw Wanda Maximoff (Elizabeth Olsen) become a full-fledged villain, but her turn to darkness might have been avoided had a certain Avenger intervened. Wanda suffered some of the most traumatic and heartbreaking losses in the MCU. Because of that, and the corrupting influence of the Darkhold, she was pushed to the brink and unreceptive to reason until Doctor Strange in the Multiverse of Madness' ending. However, she might have been preemptively saved from that darkness had one of her mentors been around.
Wanda and her brother, Pietro, were fully introduced in Avengers: Age of Ultron. Throughout the film, Wanda and Pietro antagonized the Avengers, first under the orders of Hydra and then under the orders of Ultron. Eventually, they saw the error of their ways and joined the Avengers, where they fought side by side in the country of Sokovia. Pietro even died saving Hawkeye’s life. Hawkeye reunited with Wanda in Captain America: Civil War, where he broke her out of the Avengers compound to join Captain America's team. Since this moment, Hawkeye and Wanda have not had any one-on-one contact. They were both in Avengers: Endgame fighting against Thanos’ army, and Wanda briefly reassured Hawkeye that Black Widow knew her sacrifice wasn't for nothing. But that's it, as Hawkeye wasn't included in the Doctor Strange in the Multiverse of Madness cast.
Related: Did Marvel Really Just Kill Off That Important Doctor Strange Character?
If he had been, Hawkeye might have been the perfect person to help Scarlet Witch see reason in Doctor Strange in the Multiverse of Madness due to their shared history and similar tragedies.
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