Marvel Studios own the rights to every character that has not been sold to a different sudio. Marvel Studios & 20th Centuey Fox share the rights to Quick Silver & Scarlett Witch, but do to the fact that 20th Centuey Fox owns the rights to the term "Mutaints" & the X-Men Characters Quick Silver & Scarlett Witch cannot be refered as Mutaints or have any relation to Magneto



