Mandy is a lonely divorcée who registers for Match Your DNA three years after her husband leaves her. Desperate for a child and a genuine romantic connection, she places her complete faith in the scientific certainty of the Match system. When she discovers her Match was recently involved in a severe accident, she quickly integrates herself into his grieving family's life, driven by her intense desire for the future she feels entitled to.

Christopher is a highly organized serial killer operating under the radar. He registers with Match Your DNA out of narcissistic curiosity, wanting to see what kind of person the algorithm deems his genetic equal. He maintains strict separation between his violent project and his daily life, but meeting his Match introduces an unexpected variable into his carefully controlled routine.

Amy is a dedicated police officer who approaches dating with a direct, assertive attitude. Matched with Christopher, she challenges his usual social maneuvers and refuses to play typical dating games. Her profession and commanding personality make her a unique presence in Christopher's life, forcing him to adapt his behavior.

Jade is a hotel receptionist stuck in a dead-end job, weighed down by debt, and longing for travel. When she is Matched with a man living in Australia, she initially assumes the distance is insurmountable. Urged by her friends to take a risk, she maxes out her credit cards to fly across the world and surprise him, only to face a complicated reception.

Nick is a loyal, principled man happily engaged to Sally. He takes the Match Your DNA test only to appease her desire for certainty before their wedding. When the results indicate he is Matched with a man, Nick—who has always considered himself heterosexual—is thrown into a crisis of identity, trying to balance his commitment to Sally with a sudden, unexplainable attraction.

Sally is Nick's fiancé. She insists they take the Match Your DNA test to ensure they are truly meant to be together before marrying. Her push for absolute certainty sets off a chain of events that threatens the stability of their relationship, exposing her underlying desires for an easy resolution to her personal doubts.

Ellie is the wealthy, famously isolated CEO and discoverer of the Match gene. Heavily guarded and consumed by the controversy surrounding her company, she has spent ten years in the system without a Match. When she is finally paired with an ordinary man named Timothy, she cautiously lowers her emotional armor to explore the connection, using an alias to protect her identity on their first date.

Richard is Mandy's Match. According to his online profile, he is an adventurous, athletic world-traveler who seems to be everything Mandy is not. Before Mandy can meet him, he is involved in a hit-and-run accident, leaving Mandy to piece together his identity through his family and his digital footprint.

Kevin is Jade's Match. Despite their engaging text and phone conversations, he reacts poorly when Jade shows up unannounced at his home. He harbors personal struggles that severely complicate their potential future together, forcing Jade to reevaluate her sudden journey.

Alexander is a physiotherapist from New Zealand. He is Matched with Nick, sparking an undeniable, intense mutual attraction that neither man initially knows how to handle. He plans to eventually return to New Zealand to care for his ailing father, putting a time limit on his interactions with Nick.

Timothy is a seemingly ordinary, charming, and funny man Matched with the billionaire CEO of Match Your DNA. He appears entirely unfazed by Ellie's wealth and status, patiently waiting for her to feel the euphoric connection her company promises and helping her lower her intense emotional defenses.

Mark is Kevin's older brother. He lives on the family farm and initially tries to intercept Jade when she arrives unannounced to meet Kevin. His presence creates an unexpected complication in Jade's quest to unite with her genetic destiny.

Pat is Richard Taylor's mother. Grieving her son's accident, she enthusiastically welcomes Mandy into her home, eager to connect with the woman who was genetically destined for her son. She fosters a deep dependency in Mandy, offering her the chance to fulfill her dreams of motherhood.

Chloe is Richard Taylor's sister. Initially suspicious of Mandy's sudden appearance, she exposes Mandy's lies but eventually warms up to her upon learning she is Richard's true Match. She serves as a gatekeeper to her brother's history.

Deepak is a friend of Nick and Sally, married to Sumaira. He and his wife serve as a point of comparison for Nick and Sally's relationship. He acts as a sounding board when Nick struggles with his conflicting feelings regarding his Match.

Sumaira is Deepak's wife and Sally's friend. Her casual discussion of the Match test during a dinner gathering acts as the catalyst for Nick and Sally getting tested, drastically altering the course of their engagement.

Michelle is Richard Taylor's former girlfriend. Her perspective on Richard's personality, desires, and opinions about the Match Your DNA system contrasts sharply with the idealized image presented by his mother and sister.

Paula is one of Mandy's sisters. She initially supports Mandy's quest for love but grows concerned when Mandy begins avoiding her own family to spend all her time with Richard's mother and sister.

Kirstin is one of Mandy's sisters. She is part of the familial group that tries to anchor Mandy to reality when Mandy's obsession with her deceased Match's family goes too far.

Karen is one of Mandy's sisters. She provides a sounding board for Mandy early on, though Mandy eventually views her with a sense of superiority due to Karen not being officially Matched to her children's father.

Shauna is Jade's friend. Frustrated by her own terrible dates, she aggressively pressures Jade to take a leap of faith and fly to Australia to meet Kevin, warning her not to end up alone.

Lucy is Jade's friend. She echoes Shauna's sentiments about the necessity of pursuing a Match, urging Jade to overcome her financial anxieties and travel to Australia.

Susan is Kevin and Mark's mother. She lives on the remote farm with her sons and watches the complicated dynamic unfold when Jade unexpectedly arrives from across the world.

Kat is the head of personnel at Match Your DNA. During a holiday event, she recognizes Ellie's new Match, Timothy Hunt, believing she interviewed him for a job under a different name years prior.

Sean is Mandy's ex-husband. Three years before the events of the story, he secretly registered with Match Your DNA and abandoned Mandy to start a new life when he found his genetic soulmate.