Luma are star shaped, sapient beings from the Comet Observatory. They are able to transform. Known Forms are Star Bunnies, Power Stars, Little Planets or Galaxies etc.
All Luma think that Rosalina is their Mother, but nobody knows if it's true because Rosalina is a human. According to Rosalina, Luma are young stars:
“Do you hear the baby stars? These newborns will grow up to become galaxies someday. When stars die, they turn to stardust and scatter across the cosmos. Eventually, that stardust reforms to create a new star... And so the cycle of life continues. But the cycle never repeats itself in quite the same way. So you'll see...” —Rosalina, Super Mario Galaxy
Gallery
Co-Star Luma, an orange-skinned Luma
Lubba, a purple-skinned Luma
Baby Luma, a cream-skinned Luma
Polari, a black-skinned Luma
Blue-skinned Luma
Red-skinned Luma
Green-skinned Luma
Yellow-skinned Luma