Shape shifting
The shape-shifting blue woman who frequently appears in X-men comics, cartoons, and movies is Mystique.
No.
Mystique from X-men: her real name is Raven
Yes, she does talk occasionally
There are several shapeshifters in X-Men, but perhaps the best known is Mystique.
you can't
Mystiqe was already in the comics
Because if you watched the movies then you would see that First Class was set before the X-trilogy, when Professor X, Magneto and Mystique were friends. At the end of First Class, Magneto splits from Professor X and Mystique joins him. Magneto and Professor X are enemies, so Mystique would be an enemy of Professor X since she is in alliance with Magneto.
Rebecca Romijn didn't reprise her role as Mystique in the last two X-Men movies because she was too old to play the teenaged Mystique. That's why it went to Jennifer Lawrence.
Because in X-Men first class she is on Professor X's side but in the X-Men movies she is with Magneto and has to do whatever he tells her to do
Yes, she plays Mystique / Raven Darkholme.
X-men