Originally Posted by DrCosmic
As said before, it's not really based on who appeared where, it's based on the contracts signed back in the 90s when Marvel was in money trouble. There were lists of characters, generally ones we'd expect to go together. Spider-Man came with all his villains and supporting cast. FF with theirs. X-Men with pretty much all the mutants except, so far as we know, three: Dazzler, Quicksilver, and Scarlet Witch, those last two were on a very short list of 'either can use them.' We don't know who else was on that list, but it can't be many. I suspect we'd see mutants like Justice and Firestar and Squirrel Girl on there, and not much more.
Can anyone explain why Dazzler is in a joint rights, shes not an Avenger and was always strictly an X-men character? I mean it would make more sense for Beast to be shared due to the fact that he has a lot of history with the Avengers.