Originally Posted by Mrs Vimes
I don't think that Mystique is ready to be the assassin or Magneto's right hand; and while I expect her to become more hardened, I don't see the need to shoehorn her into her original trilogy persona just yet. These prequels after all are an opportunity to explore the characters before they become what we see in X1-X3.
Maybe they could use Emma Frost to work Brotherhood's way to the U.S. government or to the President. She has more experience than Mystique when it comes to playing dirty and scheming, so I think she should be the right choice to be Magneto's right hand and at the end of First Class, it looked like Magneto recruited her to be his right hand.