Caroline's confident and talkative classmate who also sees spirits, leading her to bond with Caroline over their shared experiences and play a significant role in Caroline's journey.

A mysterious spirit who appears to Caroline during times of loneliness, offering her a sense of protection and connection to her mother's disappearance.

Caroline's mother, whose absence drives the narrative as Caroline searches for her, while fondly remembering her mother's love and tender moments they shared.

The Catholic school principal whose independence and empathetic nature provide Caroline with guidance and support as a role model.

Caroline's father lives with her on Water Island and navigates his challenges as a single parent while trying to maintain a connection with Caroline and reconcile with Doreen.

A school bully who exemplifies a lack of empathy, frequently targeting Caroline and contributing to her feelings of isolation.

A timid classmate of Caroline's, who, despite initial reluctance, becomes a friend and shares a similar feeling of invisibility at school.