Claire's father, a jovial writer of young adult novels, whose life is significantly altered following a serious health event.

The pragmatic and supportive mother of Claire and Matthew, who maintains strength for her family during difficult times.

Claire's seemingly perfect older brother, who experiences his own challenges and emotional growth alongside his family.

Claire's former best friend turned adversary, who plays a complex role in her school life and personal development.

A tough schoolmate of Claire's who initially exhibits antagonistic behavior but has deeper motivations and complexities.

A popular and fashionable girl at school known for her influence and manipulation of social dynamics.

Claire's best friends from dance school, who advance to higher-level classes while maintaining their bond with her.

Claire's intelligent yet shy best friend in middle school, who supports Claire in subtle ways during challenging situations.

A strict and old-fashioned science teacher, known for her high expectations and personal challenges that impact her teaching style.

A quiet student who demonstrates traits often associated with autism, contributing to unique social interactions at school.