Andy is a 35-year-old mildly successful stand-up comedian living in London. Devastated by the sudden end of his four-year relationship, he moves out of his shared apartment and struggles to find his footing. He relies heavily on alcohol and social media to cope with his grief, masking his deep insecurities behind nostalgia and an inability to express his emotions clearly. Eventually, he learns that he must stop outsourcing his self-esteem to others.

Jen is a 35-year-old professional who sells boat insurance. She ends her four-year relationship with Andy after a trip to Paris, citing that they have grown apart. Independent and career-focused, she struggles with societal expectations regarding marriage and motherhood while trying to assert her own desires for an unconventional life.

Avi is Andy's best friend from university and a fellow comic. He is married to Jane and has a growing family, representing the settled, domestic life that Andy desires but lacks. Though he attempts to support Andy through the breakup by organizing nights out, he struggles with emotional vulnerability and often handles Andy's grief as a series of practical tasks.

Jane is Avi's wife and Jen's best friend. She provides a warm and chaotic household for her family and temporarily opens her home to Andy after his breakup. She attempts to remain neutral in the split between her best friend and her husband's best friend, offering practical support while defending Jen's right to end the relationship.

Morris is a 78-year-old pensioner and conspiracy theorist who becomes Andy's landlord. Suspicious of others and obsessed with the Beatles, he lives a highly unconventional life. Despite his eccentricities, he provides Andy with a stable living situation and unexpected moments of candor regarding loss and independence.

Sophie is a 23-year-old fashion photographer's assistant who begins dating Andy. She embraces a highly liberated lifestyle, openly preferring non-monogamy and rejecting traditional relationship milestones. Her direct communication and differing generational values offer Andy a noticeable alternative to his past relationship.

Emery is Andy's fellow comedian and friend. Unmarried and content with a single, unattached lifestyle, Emery experiences rising success in the comedy circuit. He encourages Andy to harness the freedom of being single and suggests using the breakup grief as fresh material for his stagnating act.

Kelly is a personal trainer whom Andy hires in an attempt to get into shape post-breakup. Recently going through her own breakup, she channels her energy into intense fitness regimens and places Andy on a strict, exhausting low-carb diet.

Seb is Jen's handsome, athletic coworker. He represents everything Andy feels he lacks, such as maturity and career stability, becoming an instant target of Andy's obsessive social media scrolling.

Andy's mother provides him with unconditional love and a temporary place to stay immediately following his breakup. She tries to help him process his grief by sharing her own experiences with heartbreak and giving him a book about how elephants mourn.

Daisy is a woman Andy dated for two years prior to meeting Jen. She asked him to end the relationship when she realized he was not fully committed, leaving Andy with lingering guilt about how he treated her.

Jon is a member of Andy and Avi's extended friend group. When he goes through his own unexpected relationship fracture, he faces the same lack of emotional support from the men that Andy initially experienced.

Jackson is Avi and Jane's eldest son. As Andy and Jen's godson, he represents the intertwining of their lives and the domestic milestones that Andy and Jen's friends are reaching.

Thalia is a capable stand-up comedian and Sophie's roommate. She acts as the connecting thread that introduces Andy to Sophie during a post-show drink.

Bob is a divorcee who lives on a canal houseboat. He romanticizes his transient living situation and briefly convinces Andy to rent the boat, pitching it as the ideal bachelor lifestyle.

Miranda is Jen's married sister who provides Jen a place to stay post-breakup. She has children and shares genetic fertility traits with Jen, adding to the pressure Jen feels regarding motherhood.