Emma Frost (Earth-497)

"So, I'm stuck in my weakest form now? I can't access my telepathy? I'm just a diamond now? Great. This diamond is bound to shatter again."

-Emma Frost

Earth-497
The continuity of Earth-497 follows that of Earth-616 up until Emma Frost's diamond form was shattered. When she was reassembled by Jean Grey, Beast did an analysis on her, and found that she would now be stuck in this form. This meant that she had no access to her telepathy, and she would likely never shift into her normal form again. In desparation, she quit the X-Men, but soon rejoined, as the world proved to be very unfriendly to her now. She was made leader of the X-Men, due to her lack of emotion and ruthlessness, but this actually made her the worst leader possible for the team.