Cora is a young mother and former ballet dancer originally from Ireland. Trapped in a highly abusive and controlling marriage to a respected doctor, she lives in a state of constant hypervigilance. Her primary drive is protecting her children and ensuring they do not repeat the toxic cycles of her husband's family, a desire that culminates in her critical decision regarding her newborn son's name.

Bear is one of three possible versions of Cora's son. Named for both gentleness and bravery, he grows up to embody these traits, possessing a fearless and adventurous appetite for life. Unconstrained by his father's toxic presence, he develops a warm, sensitive nature and an intellectual curiosity that eventually leads him to study archaeology.

Julian represents another possible path for Cora's son. Raised primarily in Ireland by his grandmother, he is a deeply sensitive and cautious individual who is haunted by his family's tragic past. He fears inheriting his father's violent nature, a dread that makes him solitary but also drives him to find therapeutic expression through art and silversmithing.

The third version of Cora's son grows up heavily influenced by his namesake father's controlling and abusive worldview. Sensing his mother's trauma-induced emotional detachment, he aligns himself with his father, internalizing toxic masculinity and a desperate desire for approval. Despite his outwardly boorish behavior, he harbors a latent sensitivity that sharply conflicts with his father's expectations.

Maia is Cora's sensitive and deeply empathetic oldest child. Attuned to the dangerous undercurrents of her parents' marriage, she matures quickly, often adopting placatory behaviors in a desperate attempt to protect her mother and keep the peace. Across all timelines, Maia struggles with the trauma of her upbringing, battling an instinct to hide her true self while gravitating toward healing professions like medicine or homeopathy.

Gordon is a general practitioner who presents a charming, impeccable veneer to his patients and colleagues. Behind closed doors, he is a highly manipulative and volatile husband who utilizes coercive control to isolate and dominate his wife. Shaped by his own cruel father, a renowned brain surgeon, Gordon relentlessly seeks to maintain absolute power over his household.

Sílbhe is Cora's mother, a resilient Irish woman who remains a distant but vital figure in her daughter's life. Depending on the timeline's events, Sílbhe steps in to provide critical support and a safe haven for her traumatized grandchildren, putting her own romantic life on hold to serve as a stabilizing, nurturing guardian.

Cian is a skilled jeweler and Sílbhe's romantic partner. He serves as a compassionate, steadying presence in the lives of the Atkin children when they relocate to Ireland in one of the alternate realities. Patient and nurturing, he becomes a vital professional mentor and surrogate father figure, introducing the therapeutic art of silversmithing to the next generation.

Lily is a smart, kind girl who attends school with Cora's son. Her role and experiences vary drastically depending on which version of the boy she encounters—ranging from a cherished, long-term romantic partner to the victim of a traumatic assault. She possesses a strong sense of independence and a drive to build a meaningful career.

Mehri is a perceptive, supportive mother who enters Cora's social circle through their daughters' friendship. She is one of the few people to sense the dark reality of Cora's marriage. In timelines where Cora achieves independence early, Mehri blossoms into a vital, family-like pillar of support for the Atkins.

Felix represents a safe, compassionate male presence in the narrative. Depending on the timeline, he serves either as a brief source of safety during a crisis at his veterinary clinic or as a patient romantic prospect who helps a traumatized woman learn to trust again.

Orla is an artist whose geometric wooden creations reflect her vibrant personality. She shares a studio space in Ireland and becomes a persistent, affectionate presence in the life of a fellow artisan, though she must work through his deep-seated fears and reluctance to open up.

Vihaan is a male neighbor who lives near Cora and Gordon. He plays a brief but incredibly consequential role early in the story when he bravely attempts to intervene in a violent domestic dispute, an action that irrevocably alters the trajectory of multiple lives.

Charlotte is Maia's supportive and affectionate girlfriend in one of the alternate timelines. She attempts to offer comfort and stability to her partner, though she must often deal with the lingering shadows of her partner's traumatic family history.

Kate is a medical professional who enters into a long-term relationship with a fellow doctor. She remains a steadfast partner, even while being kept a secret from her partner's family due to deep-seated fears of parental judgment.