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The Co-Star Luma is an orange Luma that appears in Super Mario Galaxy 2 as a playable character and in the game's logo. The Co-Star Luma appears alongside Mario in the cooperative two-player mode known as Co-Star Mode, in which the second player is able to control it using the Wii Remote. Once it appears, it will follow behind Mario in the same manner as one of the mini-clouds that appear when the Cloud Flower is in use. If the Cloud Flower is actually in use, the Co-Star Luma will always follow Mario behind the last mini-cloud that trails Mario's head, as opposed to directly behind him like it normally would.
The Co-Star Luma can perform moves such as spinning, in addition to collecting and shooting Star Bits just like the first player can. The Co-Star Luma can also perform other actions that a single player cannot, such as temporarily immobilizing certain enemies or barriers and picking up far-away objects, including 1-Up Mushrooms, air bubbles (when underwater), and coins, which the Co-Star Luma will then bring back to Mario. The Co-Star Luma can also perform a variety of other actions: this includes activating switches or other objects; touching thorny flowers and causing them to retract their spikes; and spinning most Lumas (excluding Lubba and the Hungry Lumas) or Luigi to receive Star Bits. A larger Co-Star Luma also appears on Starship Mario and tells Mario about Co-Star Mode.
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