From the Super Mario Wiki
Shady Paratroopa (or S. Paratroopa) is a Koopa Paratroopa with a blue shell and slightly darker skin pigment. It appears during the events of Paper Mario: The Thousand-Year Door. Only one appears in the game as one of Mario's opponents in the Glitz Pit, along with two Shady Koopas. When they are stomped back to Shady Koopas, they can even attack on an upturned shell.
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