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As far as I know, there isn't much of a notable difference between Koopas with blue shells and those of other coloration. In Super Mario World, blue Koopas move faster than normal and will also turn around as opposed to walking off of a ledge. Also, in Paper Mario, Merlon predicts that Mario will be aided in his quest by a blue-shelled Koopa, who ends up being Kooper. MistressFisig 19:26, February 14, 2016 (UTC)

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