Octoboo

Octoboos are enemies found in Super Mario Galaxy 2 for Wii. They resemble as a mixture between Octoombas and Boos. They are usually seen in groups with at least three Octoboos and they will simply just float around in a circle together. If they happen to run into Mario while spinning around, Mario will lose a live. There is no way to defeat them ,however when near them, the player can spin the Wii Remote, which will cause a few of them to turn invisible for less than a second and during this time, the player can walk threw them.