- "Even heroes need a hand sometimes! If you have one more Wii remote, a friend can help you. Your friend can stop enemies with the A button and then shake the Wii remote to spin them into the air!"
- ― Co-Star Luma on Starship Mario explaining to Mario/Luigi about how co-op mode works.
The Co-Star Luma can do what the P2 could do back in Super Mario Galaxy except even more. It can stop and squish small enemies (such as Goombas, Koopa Troopas, and more enemies) and objects like rolling rocks. A new feature lets P2 make the Luma pass objects to Mario, like 1-Up Mushrooms, coins, and power-ups.