Shadowcat was one of those characters I didn't really have any preconceived ideas of how she should be portrayed or who she be portrayed by. She's arguably one of the most famous and popular of the X-Men yet it wasn't like Wolverine or Magneto or Storm where people feel incredibly vocal about how they should be written and portrayed. Even though I had read the comics and watched the 90s series, I had a pretty open mind about her as opposed to other characters.
Yet in the opening battle of X3, when I saw Ellen, it was like "That's her! That's Shadowcat!" I don't know whether if it's just her height but from the way she speaks to how spritely she was in X3, Ellen was just so naturally Kitty Pryde and even though she was sorta just there was a love interest in her first movie, she fit Kitty like a glove. I can't imagine anyone else playing her after DOFP and X3 and I'm so glad Ellen's career has taken off because she's a magnificent actress and just brings a lot of star power to a comic book character that deserves someone so talented playing her.