Delphie is a 27-year-old pharmacy assistant who lives an entirely secluded life in central London. Deeply affected by her parents' divorce and severe high school bullying, she actively avoids forming connections to protect herself from further emotional pain. After she dies and arrives in the afterlife, she signs a supernatural contract granting her 10 days to return to Earth and secure a kiss from a man she just met, forcing her to finally step outside her comfort zone.

R. L. Cooper is Delphie's curmudgeonly downstairs neighbor and a former successful crime novelist. He currently works from home as a computer programmer and maintains a cynical, closed-off demeanor toward the world. Dealing with profound grief following a personal tragedy, he hides his pain behind a grumpy exterior but possesses technical skills that make him a reluctant asset in Delphie's search.

Merritt is an enthusiastic Afterlife Therapist working in Evermore. She utilizes unconventional methods to help the recently deceased transition, such as decorating her waiting room to look like a laundromat to put people at ease. As a massive fan of romance novels, she views Delphie's situation through a fictional lens and engineers a contractual loophole to send her back to Earth.

Jonah is a handsome model and dancer who briefly appears in Evermore as an unconscious visitor. He possesses a conventionally appealing set of traits, including a charming personality and a history of volunteering at a children's hospital. He represents the idealized romantic partner that Delphie single-mindedly pursues across London to fulfill her afterlife contract.

Mr. Yoon is an elderly, nonverbal man who lives near Delphie. As a former violinist who now requires increasing amounts of care, he keeps largely to himself. He represents the only genuine connection Delphie maintains before her death, as both of them prefer quiet isolation over forced social interactions.

Gen is Delphie's former childhood best friend who eventually turned into her primary high school bully. She relentlessly tormented Delphie over her frizzy hair and artistic interests, causing lasting emotional damage. She now works in event organization and charity fundraising in London, presenting a polished image to the public.

Leanne is Delphie's boss at Meyer's Pharmacy. She possesses a glamorous, put-together appearance and frequently makes her own clothes. Despite Delphie's persistent rejections, Leanne continually attempts to invite her employee out for drinks and build a friendly relationship outside of work.

Jan works at the local pharmacy with her daughter Leanne. She exhibits a warm, community-focused mindset and believes strongly that human beings are built to rely on one another for support, extending this philosophy to her staff.

Aled is an upbeat, intensely friendly librarian who eagerly assists Delphie in her search for missing persons. Having experienced bullying in his own past, he compensates by aggressively pursuing friendships and trying to build a wide social circle.

Frida is a lonely but warm-hearted dog walker who recently experienced a breakup. She invites Delphie to join an art class and quickly inserts herself into Delphie's life, proving to be a surprisingly resourceful companion during covert missions.

Amy is R. L. Cooper's mother. She worries deeply about her son's isolation and depression, frequently attempting to push him into dating neighbors to force him out of his shell. She acts as a warm, surrogate maternal figure during social events.

Malcolm is R. L. Cooper's father. He participates in the family's gentle interference in his son's life and helps host their highly competitive family game nights.

Aunt Beverly is R. L. Cooper's pushy but well-meaning aunt. She openly discusses her nephew's need for therapy and aggressively pushes for photographic evidence of his dating life to ensure he is recovering.

Uncle Lester is a member of the Cooper extended family who participates in their social gatherings and supports the family's efforts to reintegrate their nephew into society.

Mrs. Ernestine is a downstairs neighbor in Delphie's apartment building. Though Delphie initially assumes she is mean, she proves to be an active and willing participant in the local community.

Ryan is Gen's husband and a former high school bully who participated in tormenting Delphie during their youth. He has since moved back to London with his family.

Eric is an Afterlife Therapist in Evermore. He initially appears to be a rival who wants to steal Merritt's clients and get her fired, though his true motivations involve a personal attraction to her.

Delphie's mother left London after a traumatic divorce, moving to an artists' commune in Texas with a new partner. She views her past life—and by extension, her daughter—as a failed project, maintaining only a sparse, dismissive correspondence.

Claude is an art instructor who runs a life-drawing class in London. He recognizes and praises natural artistic talent when he sees it, encouraging his students to develop their skills.