Louisa is a young woman reeling from the loss of her former employer and love, Will Traynor. Living alone in a London flat, she works a tedious bartending job and largely isolates herself from her family in Stortfold. She is deeply empathetic and resourceful but currently trapped by grief, guilt, and a heavy reluctance to take risks or form new connections.

Lily is a sixteen-year-old girl struggling with intense feelings of abandonment. Raised by her mother, Tanya, she acts out through rebellious behavior like drinking, smoking, and skipping school. She seeks out Louisa in hopes of learning about her late father and finding a stable environment where she feels wanted.

Sam is a sensitive and intuitive ambulance driver who crosses paths with Louisa both professionally and personally. Familiar with grief following the loss of his sister, he offers Louisa a grounded, honest presence. He challenges her to stop living in fear of the unknown, though he occasionally struggles with her reluctance to commit.

Will is Louisa's late lover and former employer, whose death eighteen months prior continues to shape the decisions of those he left behind. A once fiercely independent and adventurous man, his memory haunts Louisa, acting as both a source of profound sorrow and a complicated tether to her past. Secrets from his early adulthood introduce unexpected complications into the present.

Josie is Louisa's mother, living in the family's Stortfold home. She is currently experiencing a personal awakening, taking more risks, reading extensively, and exploring feminism. This new independence occasionally creates friction in her traditional marriage but earns her daughters' respect.

Bernard is Louisa's traditional and sometimes rigid father. He worries deeply about his daughter's isolation and insists that she attend grief counseling as a strict condition of returning to her independent life in London. He frequently clashes with his wife over her shifting priorities at home.

Treena is Louisa's pragmatic and direct sister. Living back at home with her young son, she offers Louisa blunt but necessary advice about getting her life back together. She consistently pushes Louisa to pursue new opportunities rather than remaining stagnant.

Tanya is Lily's mother and Will's former college girlfriend. She is married with two younger sons and maintains a strained, dismissive relationship with Lily. She is highly frustrated by her daughter's rebellious behavior and largely prioritizes her new family over Lily's needs.

Camilla is Will's grieving mother. The profound loss of her son has fractured her marriage and heavily affected her emotional availability. When she is first introduced to her newfound granddaughter, she acts incredulous and distant, struggling to process the unexpected connection to Will.

Steven is Will's father. Following the dissolution of his marriage to Camilla, he has remarried a woman named Della and is expecting a new baby. This major life transition makes him hesitant to fully integrate his teenage granddaughter into his current home.

Nathan is Will's former physiotherapist and a loyal friend to Louisa. Now living and working in New York City, he consistently encourages Louisa to keep moving forward. He actively tries to help her rebuild her life by connecting her with a high-paying employment opportunity abroad.

Marc is the empathetic and patient leader of the local bereavement support group. He provides a safe, non-judgmental space for members to share their emotional struggles and gently encourages Louisa to prioritize her own healing over the needs of others.

Jake is a teenager attending the grief group following the loss of his mother, Ellen. His presence in the group helps facilitate Louisa's reconnection with his uncle, Sam, leading to early misunderstandings about Sam's family dynamics.

Richard is Louisa's strict new manager at the airport bar. He initially enforces rigid rules and lacks tolerance for his staff's needs, creating a difficult work environment before eventually establishing a mutual understanding with Louisa.

Mr. Gopnik is a wealthy man residing in New York. Seeking a companion and helper for his wife, he offers Louisa a lucrative and potentially life-changing position abroad, prompting her to consider a broader future beyond London.

Mrs. Gopnik is the wealthy wife of Mr. Gopnik in New York. She requires daily assistance and companionship, prompting her husband to search for a capable caretaker like Louisa.

Peter is an opportunistic young man who exploits Lily's vulnerable situation. He uses intimidation and compromising material to extort money from her, driving much of her erratic behavior, theft, and fear.

Mr. Garside is a colleague of Lily's stepfather. He initially appears to act as a savior by stopping Peter's extortion, but he quickly reveals his own predatory intentions by attempting to exploit Lily in exchange for his help.

Thomas is Treena's young son and Louisa's nephew. He lives at the family home, providing a youthful presence amid the various adult tensions in the household.

Granddad is Louisa's grandfather. His presence at the house adds to the crowded dynamic, and his birthday becomes a minor point of contention regarding Josie's shifting household priorities.

Martin is Tanya's former boyfriend from when Lily was young. Though he and Lily were once close, he now has his own family and remains entirely disconnected from her current struggles.

Della is Steven Traynor's new wife. Expecting a baby with him, she helps establish clear boundaries when Lily aggressively suggests moving into their home.

Donna is an emergency medical technician and Sam's trusted colleague. She works directly with him during high-stress medical emergencies and provides updates during critical hospital situations.

Ellen is Sam's late sister and Jake's mother. Her passing leaves a lasting impact on her family, prompting Jake to attend grief counseling and deeply informing Sam's personal understanding of loss.