For me it was because she can be teeth-meltingly cute and vulnerable (catching butterflies, trying to snuggle with Alto) <i>and</i> be strong-willed and powerful (any time during the Vajra rampage later in the series), all without breaking character. To me, she seemed the more human of the two characters, and that's what drew me to her.
Plus she's hot, has a great wardrobe and her songs ROCK.
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