Fans are already trying to piece together the mystery behind Dr. Strange and his connection to Spiderman's fate, in "Homecoming" and if you stayed long enough at the end of the movie, Marvel regulars are keenly aware of the treasure that is usually planted there, you would have seen this was coming! "Multiverse of Madness" seems also to bring back the Scarlet Witch and maybe even a flash to a return The Maximoff Twins as well. There have also been rumors that we may actually see Loki, though there does not seem to be a hit of his presence in the trailer.
And, for a little mindless fun, Buzzfeed did a quiz not too long ago, to find out "Which Marvel Character Are You?"