Essie is a young mother living in the suburban cul-de-sac of Pleasant Court with her husband, Ben, and their two daughters. Still struggling with the emotional aftermath of severe postpartum depression, Essie feels disconnected from the idealized maternal perfection projected by her neighbors. She is naturally self-conscious but finds herself drawn into an intense, validating friendship with the enigmatic new neighbor, Isabelle.

Isabelle is a single, independent woman who recently moved from Sydney to Pleasant Court. Unlike the married mothers on the street, Isabelle stands out for her artistic demeanor and lack of conventional domestic ties. She takes a particular, focused interest in Essie, offering her a nonjudgmental ear and practical help with her children.

Barbara is Essie's mother and next-door neighbor. She functions as the quintessential supportive matriarch, stepping in constantly to help with cooking, babysitting, and emotional support. Her devotion to her daughter borders on suffocating vigilance, driven by a deep-seated need to protect her family structure at all costs.

Fran is a pragmatic, composed lawyer currently on maternity leave with her second child, Ava. To the outside world, Fran is grounded and logical, seemingly immune to the neighborhood gossip. In private, she channels an immense, unspoken emotional burden into grueling, punitive daily runs.

Ange is a successful real estate agent and the self-appointed social architect of Pleasant Court. Ange maintains a pristine home and curates a picture-perfect family image for social media. Beneath her polished, controlling exterior, she harbors deep insecurities about her marriage and fiercely polices her environment to prevent any disruption to her idealized life.

Ben is Essie’s energetic, optimistic, and fiercely loyal husband. As a fitness studio owner, he approaches life with a straightforward, physical discipline that sometimes leaves him ill-equipped to understand the complex nuances of his wife's mental health struggles.

Nigel is Fran's husband, characterized as intellectual, logical, and deeply dedicated to his children. He recently recovered from a severe bout of depression triggered by a financial loss, an experience that temporarily distanced him from his wife.

Lucas is Ange's charming, handsome husband who works as a photographer. Outwardly, he plays the role of the engaged, creative father and model suburban husband, though his interactions with female clients constantly trigger his wife's anxiety.

Mia is Essie and Ben's three-year-old daughter. Her early infancy was marked by her mother's severe postpartum depression, but she is now an active, central part of the Walker family dynamic.

Polly is Essie and Ben's infant daughter. Her fussiness and poor sleep schedule heavily contribute to Essie's current state of exhaustion.

Rosie is Fran and Nigel's older daughter, a toddler who enjoys playing with LEGOs and putting on puppet shows for her parents.

Ava is Fran and Nigel's six-week-old infant daughter. Her arrival coincides with Fran's intense internal distress and daily running compulsion.

Will is Ange and Lucas's older son. He is active in sports like soccer and is a core part of Ange's meticulously crafted family image.

Ollie is Ange and Lucas's younger son, conceived shortly after a period of marital instability. He later breaks his wrist while skateboarding in the cul-de-sac.

Jules is a man from Isabelle's life in Sydney. He is largely unaware of the true, specific motives driving Isabelle's sudden relocation to Melbourne.

Erin is a former photography client of Lucas's. Her familiar, hushed interactions with him catch Ange's attention and spark intense suspicion.

Charlie is Erin's young toddler daughter. She displays mannerisms that Ange closely observes from afar.