* Lila: The protagonist, a teenager struggling with addiction and the aftermath of trauma. She is a complex character, grappling with anger, self-destruction, and a desire for connection.
* Rachel: Lila's mother, a woman battling her own demons and struggling to provide for her daughter. She is portrayed as loving but flawed, caught in a cycle of addiction and unhealthy coping mechanisms.
* David: Lila's father, a seemingly absent figure who resurfaces later in the novel. He is a mysterious character, with a troubled past that impacts Lila's life.
* Mr. & Mrs. Hayes: The foster parents who take Lila in after she is removed from her mother's custody. They are portrayed as well-meaning but ultimately unable to fully understand or help Lila.
* Cam: A young man who becomes a friend and love interest to Lila. He offers her support and understanding, but their relationship is complicated by Lila's past and her struggles.
These are the main characters, but *Glass* also features several other supporting characters who play significant roles in the story. These include:
* Lila's therapist: A professional who attempts to help Lila navigate her trauma and addiction.
* School counselor: A teacher who tries to provide guidance and support to Lila.
* Lila's classmates: Other students who interact with Lila and influence her life.
It is important to note that these characters are all deeply flawed and complex, reflecting the harsh realities of addiction, abuse, and mental health issues.