Mystique

Mystique is an amoral mutant shapeshifter and an enemy of the X-Men who appears in Marvel Disk Wars: The Avengers.

Ultimate Spider-Man
Mystique's name can be seen on one of the news tickets, noted being questioned in a string of bank robberies. Spider-Man imagines the musical "Mutant and the Beast" starring Mystique and Beast.

Marvel Disk Wars: The Avengers
Mystique was hired by Red Skull to steal the DISKs and give them to Crossbones. She disguised as Pepper Potts and got the DISKS containing Baron Zemo, Abomination, Graviton, M.O.D.O.K. and Tiger Shark, but after she handed them to Crossbones, he betrayed her and knocked her out to be found by the authorities.