From the Super Mario Wiki
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Roller Guys are a variant of Shy Guy that appear in Paper Mario: Color Splash. They ride around inside of a yellow and green striped ring, and they come in red, green, and pink. Additionally, blue and yellow variants exist, but cannot be fought. When they are inside their ring, Roller Guys cannot be attacked by jumps or hammers. They attack by rolling into Mario, doing 12 HP of damage. After they are attacked a few times, their rings break. They act like normal Shy Guys once their ring is broken.
Roller Guys appear in Mossrock Theater, and some ride on top of their ring. They try to run over Mario, and cause 20 HP of damage if he is hit. When on top of their ring, they cannot be battled.