"I'll tell you what's that place if you catch all of us!"
― Star Bunny, getting ready to be caught, Gateway Galaxy

Star Bunnies are a species of rabbit who live in galaxies around outer space. Many, but not all Star Bunnies are actually Lumas who transform into Star Bunnies. Mario first runs into them when he lands in Gateway Galaxy in Super Mario Galaxy. They turn into Lumas after they ask Mario to chase them and he catches them.

Some of them are also a subject of catching, and they will give up a Power Star when caught. This happens twice in both Gusty Garden Galaxy and Gold Leaf Galaxy. They also are in Super Mario Galaxy 2. Once you find them in space, they come onto Mario's ship, Starship Mario.