Tommy is a student at Hailsham and a clone, known for his anger issues as a child due to bullying. With Kathy and Miss Lucy's help, he manages his anger but struggles with creativity. He bonds with Kathy over speculative theories about their situation and shares a complex relationship with Ruth, leading to tensions and a missed connection with Kathy.

Ruth is Kathy's best friend and Tommy's romantic partner, known for her charisma and scheming nature. She navigates her relationships through manipulation and fear of loneliness, sometimes causing hurt to both Kathy and Tommy. Despite her actions, Ruth is driven by a desire for approval and love from those around her.

Madame is a cold, stern figure who visits Hailsham to collect students' art for a Gallery, taking only the best works. Although she appears detached, she is an advocate for the rights of clones and deeply troubled by her failure to secure their recognition.

Miss Emily is the head guardian at Hailsham, respected by students for her fairness despite a fearsome presence. She runs Hailsham as an experiment to highlight clones' humanity, but ultimately faces disappointment and financial ruin after failing to change societal perceptions.

Miss Lucy is a guardian at Hailsham who believes in being truthful with the students about their futures. Her candidness clashes with Miss Emily's philosophy, leading to her departure. She significantly impacts Tommy's life by helping him manage his anger.