Luna is of Mexican descent on her mother's side and Indian descent on her father's side. Luna's mother died giving birth to her and she was raised by her father and grandparents in a Navajo reservation. As Luna's mother died giving birth to her, Luna is responsible for indirectly ending her mother's life. A shapeshifter who kills another shapeshifting member of their family becomes a skinwalker, someone capable of turning into any animal (including humans) on Earth. The Navajo believed skinwalkers to be evil witches so Luna most likely had a difficult time growing up. At some stage, she shapeshifted into her dead mother. Luna deemed the experience "crazy" and "scary" but she was also happy to assume the form her own mother who she never remembered.