Co-Star Luma

Co-Star Luma is an orange Luma that appears in Super Mario Galaxy 2 as a playable character. Co-Star Luma appears alongside Mario in the cooperative two-player mode (Co-Star Mode), in which the second player is able to control it using only with the Wii Remote. Co-Star Luma can perform moves such as the spin, and also perform other actions that a single player cannot do, such as immobilize enemies, and picking up far-away objects like 1-Up Mushrooms and bringing them back to Mario. If there isn't a second player, then Co-Star Luma will appear on Starship Mario... Interesting enough, if there is a 2nd player on the Starship Mario, then there will be 2 Co-Star Lumas.

Trivia

 * The player controlling Co-Star Luma can make sounds on his/her and player one's Wii Remote by pressing buttons on the remote.
 * The Co-Star Luma can "dance" with allies, and can even receive Star Bits from other Lumas (excluding Lubba) by pressing A when they're selected and spinning.