These two are something like brother and sister type duo. Baby Shimmer is Bonded with Mosalina and Baby Boo is like Mosalina's best friend and pet. Baby Shimmer is like the mini princess of the Moon and Baby Boo is like the mini prince of the Moon.

Note that
The Goddess of Light- AzulTheRaichu
The Goddess of the Sun- NintendoNatalie
And Ms. Violet_Mario will also get a bonding Luma as well. (And that's because the 2 goddess volunteered to be in Book 2✳Entries are still open I believe✳ and Violet is also part of the Mario Brother family. Those will be updated pretty soon.

Luma will be based of your favorite color and what the name the you want it to be