Paper Shy Guy
From the Super Mario Wiki
Paper Shy Guys are paper forms of Shy Guys that appear as enemies in Mario & Luigi: Paper Jam, encountered in Mount Brrr on the path to Neo Bowser Castle. Two of them are also fought in Neo Bowser Castle alongside two regular Shy Guys as one of Bowser's last lines of defense. A regular version may toss their Paper variant as a form of attack, which if not hammered back will cause the Paper Shy Guy to join the battle. On their own, Paper Shy Guys can line up with one bro and charge at them, if they point their arms forward before moving they must be jumped over, and if they point upwards the bro must idle. One can fold into a spike on top of a regular Shy Guy who will walk towards Paper Mario, and will shuffle between the spiked one and a non-spiked one. Paper Mario must jump on the non-spiked Shy Guy to end the attack successfully. Two of them can align with the regular Bros and charge at them, and must be hammered. The one that trips will reach the Bros last.
Rare, shiny variants can also appear in place of the regular Paper Shy Guys in the same areas. These Shy Guys have greater stats and will always drop a Shiny Battle Card and 1-Up Mushroom when defeated, though their methods of attack remain the same. Stronger versions of a shiny Paper Shy Guy can also appear alongside Shiny RoboBowser during the battle, which have even greater stats and may drop a Max Syrup Jar upon defeat.