- Jace Morgenstern/Herondale/Lightwood/Wayland: A Shadowhunter that is in conflict after finding out that Valentine Morgenstern is his father and Clary Fairchild is his sister. In this book, Jace is in a battle with himself, the certain choice and finding the truth.
- Clary Morgenstern/Fairchild: A gifted Shadowhunter, that is in a mission to cure her mother from her coma, and discovers many secrets on the way. Through the book it is displayed her gift works to save Alicante from Valentine's attack.
- Isabelle Lightwood: Alec Lightwood's sister, and rebellious girl and a strong Shadowhunter. In this book, after losing Max Lightwood (the youngest sibling), she goes through a self-conflict on her true potential as a Shadowhunter.
- Alec Lightwood: Jace’s parabatai and Isabelle Lightwood's brother, works to reveal his true self and sexuality as it goes against the Shadowhunter society and his family.
- Magnus Bane: A high warlock in New York that helps the Lightwoods and Clave. In this book, Magnus works in a way to aid Alec's true self to the Clave and family.
- Simon Lewis: Clary's best friend that is a Daylighter vampire (a vampire that is not burned by the sun), and becomes part of the Shadowhunter world.
- Luke Garroway/Graymark: A friend of Jocelyn (Clary's mother), that aids to raise Clary, as a werewolf, was a former Shadowhunter. In the book, he aids to protect Clary and aid her in her certain goals.
- Amatis Graymark: Luke's sister that lives in Alicante. In this book she aids to protect Clary and aids to save her life when she fell into Lake Lyn and started to hallucinate.
- Sebastian Morgenstern: A mysterious Shadowhunter that comes into the Penhallow house, pretending to be Aline Penhallow's cousin. It is revealed in the book that he is Clary's actual brother and the true plan that he has with Valentine.
- Jocelyn Fray /Fairchild/Morgenstern: Clary's mom who was awakened from a spell by the warlock Magnus Bane at the end of the book.
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