They're not Koopas, obviously. In SMB2 Shy Guys were made by Wart with the Dream Machine. And guess what else? They ARE wearing masks because they're shy! It says so in the SMB2 manual, and I think it's kind of obvious! Honestly, some of these dumber posts hurt my head...
Must...not...harbor...perverse...sexual...lust...for...the...SMRPG...fan...girl...