The actual powers and limitations of a Nexus Being have never been fully defined in the Marvel comics. What’s known is that they have influence over probabilities and the future, and that they are strongly connected to mystical energy and the multiverse. Sound familiar? Doctor Strange isn’t a Nexus Being in the comics, but his role in the MCU could turn him into one, depending on how Marvel Studios defines them.
Doctor Strange in the Multiverse of Madness will feature Scarlet Witch and, of course, the multiverse itself. That film is being heavily set up by the events of WandaVision and it’s likely that Strange will be at the very least heavily connected to nexus points, if not a Nexus Being himself. Much of how that plays out will depend on the actual happenings of the film, of course, and similarly by the events of WandaVision’s climax.
Originally from https://screenrant.com/mcu-nexus-beings-multiverse-wandavision/