From the Super Mario Wiki
Paint Guys are a type of Shy Guy that appears in the game Paper Mario: Sticker Star. Paint Guys are Shy Guys that carry a can of yellow paint into battle and are usually accompanied by Snifits, Clip Guys, and Ninjis. If the Paint Guy still has a paint can over their head, they will attempt to cover the screen with yellow paint. If successful, the paint will cover up important things like the health bar and Mario. If they fail to do so, the Paint Guy will go back to its position with its can of paint above its head. Once a Paint Guy loses its paint can, it will attack like a normal Shy Guy.
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