Malachi is a complex young man who enters the adoption system following a traumatic early childhood. He is eventually adopted by the wealthy Vize family at age eight. Diagnosed with selective mutism, he communicates primarily through sign language and struggles with severe anxiety. He relies heavily on routine and the presence of his adoptive sister to manage his psychological distress.

Olivia is the adopted daughter of the wealthy Vize family. She was taken in after suffering early childhood neglect and the loss of her biological baby brother. She is popular and outgoing, providing a sharp contrast to Malachi's silent intensity. She struggles to balance her gratitude toward her adoptive parents with her desire for personal autonomy.

Jamieson is a successful criminal defense attorney and the patriarch of the Vize family. He possesses a strong savior complex that drives him to adopt children with severely troubled backgrounds. He often struggles to connect emotionally with Malachi and defers to his wife's parenting decisions, leading to a strained household dynamic.

Jennifer is an esteemed judge and the matriarch of the Vize family. Despite her professional independence, she holds rigid views regarding social status and women's roles in society. She exerts intense control over Olivia's life and grooms her for an arranged marriage to secure wealth and influential connections.

Igor is the patriarch of the wealthy and dangerous Reznikov family. He approaches marriage as a business transaction, having paid a massive sum to secure Olivia for his bloodline. He expects absolute obedience from both his sons and his business partners.

Molly is a sheltered teenager adopted by the Vizes at the age of five. She shares a background of trauma similar to her older siblings but maintains a curious, excitable disposition. She provides a sense of renewed hope for the family and quickly forms attachments to both Olivia and Malachi without judging their dynamic.

Abigail is Olivia's petite, purple-haired best friend. She is outgoing and irreverent, providing a lively contrast to Olivia's heavier familial burdens. She is fiercely protective of Olivia and views Malachi's intense behavior with deep skepticism.

Xander is a tall, brown-haired member of the powerful Reznikov family. He is positioned as Olivia's arranged husband through a contract negotiated by Jennifer and Igor. He projects a threatening, domineering attitude to ensure compliance with the arrangement.

Sebastien is the Scottish cousin of the Reznikov brothers who operates as a point of contact for their powerful family. He utilizes humor to defuse tense situations and navigate the dangerous world he inhabits. His irreverent commentary often clashes with the grave circumstances surrounding the arranged marriage negotiations.

Mason is Malachi's best friend and Abigail's foster brother. He shares Malachi's penchant for reckless behavior and frequently hangs out in his basement with their motorcycle group. He is one of the few people outside the Vize family who understands how to communicate with Malachi.

Adryx is Xander's brother and a member of the influential Reznikov family. He participates in the family's intimidation tactics regarding Olivia's arranged marriage contract. He is fluent in sign language, a skill that occasionally bridges communication gaps during tense encounters.

Parker is an older man chosen by Jennifer as a potential match for a teenage Olivia. He comes from a wealthy background and attends the Vize family's social gatherings. His sense of entitlement leads him to ignore boundaries, creating dangerous situations for those around him.

Malachi's biological father is a loving but deeply troubled man who struggles with his mental health. He attempts to shield his young son from distress by engaging in playful activities, such as saving a spider at the merry-go-round. His battle with his own mind ultimately forces a permanent separation from his family.

Malachi's biological mother struggles with severe substance use after her husband leaves the family. She frequently neglects her young son, locking him in his room and leaving him in unsanitary conditions. Her dangerous lifestyle choices invite criminal elements into their home, triggering the defining trauma of Malachi's life.

Rex is a pet tarantula given to Malachi by his biological father. The spider provides the young boy with a vital source of comfort and routine during a period of severe neglect and isolation. The creature represents Malachi's few positive connections to his early childhood.