Technically, Zelda would be the Krystal clone, since no one uses Zelda. >_>
I'm saying, take all the moves that are wasted on a character everyone transforms to Sheik anyway, and give them to a more agile character. Make Krystal a staff-wielding magic-user that moves quickly. The main problem would be keeping her from becoming OP.
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Captain Tracy Mombaro and Agent Mirasuke Inhara: Two of the toughest, hottest furrs you'll ever meet.