Mystique

A mutant with the ability to morph into any other humanoid form, Mystique is one of the X-Men's greatet foes. In her civilian identity as Raven Darkhölm, deputy director for the Defense Advanced Research Planning Agency, this shape-shifter is able to gain access to military secrets and weaponry. Once the leader of the Brotherhood of Evil Mutants, Mystique became the surrogate mother to the wayward young mutant who would eventually become the X-Man known as Rogue.