Originally Posted by blalex620
FOX holds the rights to Viper sadly (she's appearing in The Wolverine) and I think they hold the rights to the Shi'ar too since if I'm not mistaken they deal a lot with the X-Men mostly.
The funny thing is, if you look at Ms. Marvel's history she's more tied to the X-Men than to the Avengers. Her biggest enemies were Mystique, Deathbird and Rogue. After Rogue stole her powers she lived with the X-Men. When she became Binary she joined the Starjammers. She fits in better with the X-Men, imo.