I personally think that Lady Gaga is more famous because i've
never heard of "Shadow" and i'm twelve.
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Shadow the hedgehog may not be as famous but if you play the
sonic the hedgehog games, you will know that shadow is amazing. For
more info look up shadow the hedgehog and click his wikia page
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You have to complte the quest from the the king of SwordHaven
and Shadowfall lady.