Raven Darkhölme, better known as Mystique, is a prominent character in the X-Men series. She is a mutant shapeshifter, able to mimic the appearance and voice of any person with exquisite precision, making her a formidable spy and assassin. Mystique is known for her blue skin and yellow eyes. Throughout the series, she plays an ambiguous role, often acting as both antagonist and anti-hero, leading the Brotherhood of Mutants and challenging the X-Men in their struggle for mutant rights.