Info Mystique:
Mystique (Raven Darkhölme) is a fictional character associated with the Marvel Comics' franchise, X-Men. Originally created by artist David Cockrum and writer Chris Claremont, she first appeared in Ms. Marvel #16.

Throughout most of her history, Mystique has been a supervillain, founding her own Brotherhood of Evil Mutants and assassinating several important people involved in mutant affairs. Mystique herself is a mutant, a shapeshifter whose natural appearance includes her blue skin and yellow eyes. At one point, she mentioned she is over 100 years old. Mystique is the mother of the villain Graydon Creed, the X-Men hero Nightcrawler, and foster mother of the hero Rogue. She was forced to abandon Nightcrawler, but raised Rogue for a number of years and the two women have mixed feelings towards one another.

Despite Mystique's history of crime, she has worked with the X-Men's Professor X, in a short-lived series. She was later voted straight into the X-Men. Actress Rebecca Romijn portrays Mystique in the X-Men films. In 2009, Mystique was ranked as IGN's 18th Greatest Comic Book Villain of All Time.
Source: wikipedia.org