The Lagerkvist family has been a major part of Sweden's Spirit Sector and has many members serving in high ranking positions. Petra comes from a long line of holy maidens from the Lagerkvist family, and is the most powerful yet. Like her predecessors, she works for Sweden's Spirit Sector and is the youngest member to be selected to join their group. Her spirit power is excellent, and it is said that her powers could rival Mildred Avallone from the Spirit Sector in England.