BARELY and she has been recast every time. She is the genius brunette bubbly peppy teen who grew up into a tough leader and is from the Chicago suburbs, and was introduced at 13, and I started reading her when I was 11, so I of course imprinted on her at that age. Also she has a pet dragon. And is a latent magic user. Seriously, I'm a ridiculous fan of Kitty Pryde. (Probably best not to ask the terrible things Joss Whedon has done to her during his X-Men run.)
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There are DECADES' worth of spoilers here: http://marvel.wikia.com/wiki/Katherine_Pryde_(Earth-616)