* Briar: A teenager who is deeply grieving the loss of her best friend, Jack, in a car accident. She believes she can communicate with him through a set of magical, glowing stars.
* Jack: Briar's best friend who passed away in the car accident. He is a supportive and compassionate presence in Briar's life, even after his death.
* Leo: A boy Briar meets at the hospital who also lost his best friend in the accident. He is initially suspicious of Briar's beliefs about the stars and their connection to Jack.
* Pip: A small, curious creature that appears to Briar after the accident. Pip is a magical being who acts as a guide and helps her understand the mysteries of the stars and their connection to the departed.
These four characters form the central core of the story as they navigate grief, loss, and the mysteries of the afterlife.