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Emma Carstairs is known to be the next greatest Shadowhunter, or in other words "the next Jace Herondale" (so to speak). In this book she faces a lot of tough decisions about her future while fighting for information on her parents' death in addition to struggling with the question of why you can't fall in love with your parabatai. She treats the Blackthorns as her actual family and would do anything for them. She is friends with Cristina Rosales and ex-girlfriend of Cameron Ashdown.
Julian Blackthorn (first featured in City of Heavenly Fire)
Julian Blackthorn is Emma's parabatai and lives in the Los Angeles Institute with his siblings, his uncle Arthur and Emma. Due to Arthur's mental health, Julian runs the Institute and cares for his siblings.
Mark Blackthorn (first featured in City of Heavenly Fire)
Mark Blackthorn is the older half-brother of Julian, Livia, Tiberius, Drusilla and Octavian. He is half-fey. After being given to The Wild Hunt in City of Heavenly Fire, Mark is returned to his family by the Wild Hunt as a bargaining chip for Emma and the Blackthorns to solve murders happening to Mundanes and Faeries.
Cristina Mendoza Rosales
Cristina Mendoza Rosales is a Shadowhunter from the Mexico Institute, who comes to study at the Los Angeles Institute and becomes friends with Emma.
Diego Rocío Rosales
Diego is a Centurion and someone Cristina once loved. Also called "Perfect Diego." Diego was in love with Cristina Rosales, and they had plans to marry while Cristina also planned to become parabatai with his younger brother, Jaime. Cristina's mother greatly approved of their union. Diego and Cristina are distant relatives.
The Blackthorn Children (Livia, Tiberius, Drusilla, Octavian) (featured in City of Heavenly Fire)
Livia, Tiberius, Drusilla and Octavian are the younger siblings of Julian and Mark.