Paper Macho Boo
From the Super Mario Wiki, the Mario encyclopedia
A Paper Macho Boo is an enemy appearing in Paper Mario: The Origami King, a type of Paper Macho Soldier. They appear in Scorching Sandpaper East while the desert is dark. Like regular Boos, they will stop moving if Mario looks at them, and will chase him if he looks away. However, rather than its face changing expressions naturally, its face is actually a sphere that rotates to show different expressions, with one side having a smiling face and the other having a scared face. To defeat Paper Macho Boos, Mario must hammer a King Olly sticker on its back, and can then hammer it anywhere a few more times.
One Paper Macho Boo Is fought as the fourth Paper Macho opponent on Scuffle Island with the title "Ghostly Goliath". This one has three stickers on its back, and Mario recoils much farther than normal when hitting it.
Names in other languages
Title (Scuffle Island)