I don't know but when shy guy falls in the tennis game I see black when he trips.A.k.a butt
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The mask is its face.
If you mean the ones...with the mask: Shy Guywith the mask, shooting cannonballs: Snifit
a great guy
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Interesting question in fact on Mario power tennis you can actually see whats behind shy guys mask all his face is is a black mass with yellow glowing eyes (creepy).