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Originally posted by Michael:
I keep reading and remembering things. Wasn't the "White Witch" a Marvel character in the X-Men comics? She was a telepath who was part of the Hellfire Club (a group of evil mutants) that later supposedly "reformed" and joined the X-Men where she became the love interest for Scott Summers a.k.a. Cyclops following the death of Jean Gray, The Phoenix.
No, the name is a confusion of the White Queen (Emma Frost, who you described), and the Scarlet Witch (Wanda Maximoff, daughter of Magneto)

"You need me. You wouldn't be much of a hero without a villain. And you do love being the hero, don't you. The cheering children, the swooning women, you love it so much, it's made you my most reliable accomplice." -- Lex Luthor to Superman, Question Authority, Justice League Unlimited