An artist grappling with personal loss and searching for purpose whose life is heavily influenced by his family legacy and the people he meets on his journey. He is deeply connected to his family's historic chestnut tree.

An intelligent, accomplished woman from a Chinese immigrant family, drawn to environmentalism through her father's influence and personal experiences. She balances professional success with the emotional weight of her past.

A man marked by his experiences in psychological and military environments who seeks redemption through environmental efforts. His actions and choices reflect his search for meaning and atonement.

A psychology academic initially involved with the environmental protestors for research, whose journey is shaped by his need for belonging. His scientific background and personal isolation are key aspects of his character.

A pioneering scientist whose work on trees gains recognition later in her life, impacting many characters towards environmental consciousness. She dedicates her life to ecological research and advocacy.