A princess and sister to Queen Medusa of the Inhumans, Crystal is a noble and compassionate member of the royal family; while she controls elemental substances, she only does so to protect her family and others from harm. When she’s not fighting alongside Earth’s heroes, like the Fantastic Four and the Avengers, she takes her role as a royal seriously and works for the betterment of her people.
Crystal was born as Crystalia Amaquelin into the Royal Family of the Inhumans, a sub-species of humanity from the city Attilan who were diverged through Kree experiments. The Inhumans are a hidden race preoccupied with genetics; they developed the Terrigen Mists, a mutagenic compound routinely exposed to many Inhuman children to unlock their potential for superhuman abilities—Crystal among them. Her parents are Quelin and Ambur, and she is sister to Medusa, Queen of the Inhumans.
While others in the Royal Family eagerly embraced a warrior heritage, Crystal preferred more peaceful pursuits and never took to her battle training. Though when Crystal and her family were exiled to Earth and Medusa went missing, Crystal helped find her sister and later became a close ally of the Fantastic Four and the Avengers.