Vision (and White Vision) don't appear in Doctor Strange in the Multiverse of Madness despite the movie focusing so heavily on Scarlet Witch's story - but why is this the case?. Doctor Strange in the Multiverse of Madness once again stars Benedict Cumberbatch as the titular sorcerer, while Elizabeth Olsen's Wanda Maximoff/Scarlet Witch portrays the film's villain, who is attempting to gain the multiverse-jumping powers of Xochitl Gomez's America Chavez to travel to a reality where her children are alive so that she can be with them. While her intentions come from a place of familial longing, Wanda's means to get there are deadly and devastating, punctuated by the loss of her better half, Vision, and her created children, Billy and Tommy.
Paul Bettany's Vision is the synthetic android created by Ultron, who gained sentience early on, eventually falling in love with Wanda. The couple went into hiding after the events of Captain America: Civil War where their love blossomed, but this romance was cut short by the events of Avengers: Infinity War when Thanos came for the Mind Stone that resided in Vision's head. This forced Wanda to have to kill Vision, only to see Thanos rewind the moment with the Time Stone and take it anyway, leaving Vision dead in the process. The devastation of Vision's death sent Wanda into an emotional spiral, where she went on to take over an entire town, Westview (as seen in WandaVision), turning it into a sitcom-style world where she controlled everything - even projecting a version of Vision while creating children for them as well. She is eventually forced to shut it all down, retreating to a remote locale, where she continues to search for a way to bring her loved ones back with the help of the Darkhold book of magic.
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During Wanda's time in Westview, SWORD sent in a newly-manufactured Vision, aka White Vision, who confronts the projected version created by Wanda. During that interaction, the projected Vision gives White Vision his memories, effectively making him the new Vision, who escapes the town and has not been seen in the MCU since. In Doctor Strange in the Multiverse of Madness Vision is mentioned a handful of times but is never seen. Instead, Wanda appears to be solely focused on being reunited with her kids in an alternate reality but makes no mention of wanting to bring Vision back as well, let alone what she would do if his appearance in that new reality questioned or challenged her being there. Olsen later explained that the decision (via Collider) for her to find a reality where it was just Wanda and the kids, rather than one with Vision and the kids, was born of maternal instinct, saying: "The kids are part of [Wanda's] myth as well. I think that's also part of it. I do think that once you're a mother, the loss of your child is more painful than any other loss you could ever experience. That's really why."
Why Isn't Vision With Wanda's Kids In Other Universes? While there are undoubtedly multiple Visions in other universes, in Doctor Strange in the Multiverse of Madness, Scarlet Witch is simply looking for one where he isn't there. As Olsen explained, the decision was made early on to have Wanda in search of a reality where it was just Wanda, Billy, and Tommy. "They got divorced. They're separated. She's not wearing a wedding band for a reason," Olsen said. So, it's possible that Vision exists in that world, but he simply isn't with the family for many reasons. The catch to Wanda finding a reality where it was just Wanda and the kids is that she would have to dispose of the other Wanda to take her place, which shows her obsessive and villainous intentions to do whatever she has to in order to get what she wants. It also ignores the potential problem with killing off a Wanda in another universe, as that could have serious side effects on that universe. It's ultimately an act of grief-fueled desperation.
Where's White Vision During Doctor Strange 2? The last time White Vision was seen was when he (re)gained his memories from the projected Vision and flew out the Westview Library window after saying, "I am Vision." The events of Doctor Strange 2 take place after WandaVision, while she is in hiding with the Darkhold book, but White Vision is nowhere to be seen. It's unclear where White Vision may be or what he may be up to, but as has gained sentience from the control of SWORD, he's likely formulating his reappearance significantly, especially given his overall intelligence and power, as well as deep-seated love for Wanda.
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