Originally from California, Rosa was in a car accident when she was 8 years old and vanished through a door of light leading to Gilverado. In critical condition and near death, she was found by Dior and nursed back to health becoming the first of his adopted daughters.
Rosa is the leader of the Angels and uses her experience to protect her adoptive sisters. She has an odd brand of humour that often serves to smooth over differences between her team members but unsettles others. She regularly seems to playfully flirt with Sakura.