Clara Popple, the sixteen-year-old eldest daughter of a Yorkshire family migrating to 1830s Adelaide, balances maturity and responsibility by managing household duties and caring for her younger siblings: Lucy-May (7), Kate (10), Ben (12), and Tob (2). Her reserved, serious demeanor—often casting her as the "Perpetual Frowner"—contrasts with her sisters' liveliness, though family moments reveal occasional warmth. She typically wears blue attire, reflecting her "True Blue Femininity" role.

Financially supporting her family, Clara works at a bakery and assists neighbors while demonstrating academic skill, notably tutoring Lucy-May in mathematics amid the younger girl’s academic struggles. Her romantic relationship with John, a sailor from their migration voyage, evolves into marriage. Their wedding coincides with family turmoil: Arthur Popple’s rejection of the Princetons’ farmland offer in exchange for adopting Lucy-May, layered over ongoing financial uncertainty in Australia.

Clara fiercely protects her family, comforting her father during Lucy-May’s disappearance and discouraging his alcoholism while supporting her mother and siblings emotionally. She interacts with Sylvia Princeton during the adoption attempt, learning of Mr. Princeton’s ties to the mining company where Arthur seeks work. Initially aloof toward her siblings’ adventures, Clara grows into a more engaged presence through practical aid—managing crises, participating in decisions, and sustaining the household.