Tessa Gray

Theresa is called Tessa by most and is referred to as Tessa throughout this study guide, except in direct quotes. Tessa is a young orphan girl who discovers that she is not fully human. Though the information shakes her, she quickly adapts and is willing to help the Shadowhunters shut down an illegal vampire party in the hope of saving her brother. Tessa is completely loyal to everyone she cares about, which makes her brother's betrayal even more horrific in her eyes.

Tessa is a strong character, though she does not realize the extent of her strength and does not consider herself brave. She does not know about her power until after she reaches England and another shape shifter teaches her to harness her power. She is horrified by the knowledge that she is not human, but she willingly uses her power when the Shadowhunters search for...