"While I Live--And until I die--I am an Avenger!"
A lot of people were introduced to Scarlet Witch (aka Wanda Maximoff) in the recent Marvel movie Age of Ultron, but she's been around for much longer. From the comics to the cartoons, she's had a huge impact on the Marvel universe.
"A new world has opened for me, and I am aware of much more than your cloistered intellect could hope to know!"
Origins: Wanda was introduced in 1964, initially as a mutant and the daughter of Magneto. She and her brother Pietro had a traumatic childhood, and they were initially recruited by the Brotherhood of Evil Mutants, though they eventually changed sides and joined the Avengers instead.
Powers: Wanda is able to manipulate Chaos Magic, and her hexes are a small example of what she can do. During the House of M arc she was actually able to take away the powers of the majority of mutants on Earth. Though the extent of her abilities varies depending on the writer it's accepted that she can fly, move things with her mind, and manipulate probability.
"But everyone's story begins once upon a time...and it's up to us to cherish the time we're given to ensure we live happily ever after."
Wanda is another complex character. She's incredibly powerful, and often her story arcs involve questions about how to use that amount of power responsibly.