Father Declan is a Catholic priest in his early sixties who has served the rural Irish parish of Roonatellin in County Mayo for five years. He is a traditional, authoritative figure whose strict adherence to Church doctrine often conflicts with his underlying loneliness. An avid and experienced angler, he frequently seeks solace and meditation through salmon fishing, using the natural world to process his heavy pastoral duties.

Enda is an eloquent and resilient woman living in rural Ireland with her partner, Kevin. Having survived a deeply traumatic and impoverished childhood in isolated Donegal, she possesses a sturdy, pragmatic worldview that prioritizes survival over societal expectations. Though lacking formal education, she commands an impressive vocabulary and an intuitive intellect that allows her to challenge religious authority.

Kevin is a highly capable and hardworking man who shares a quiet, isolated life with Enda in the Roonah Valley. A pragmatic man of action, he expresses his deep devotion through tireless physical labor and a constant drive to ensure their mutual safety. Beneath his stoic exterior, he harbors a quiet fascination with kestrels and the unfettered freedom they represent.

The father of Enda and Kevin is a grieving, broken man who descends into severe alcohol addiction following the tragic death of his wife. His unresolved sorrow manifests as profound cruelty and neglect toward his children, forcing them into heavy labor. His erratic and dangerous behavior creates an environment of intense fear that cements his children's absolute reliance on one another.

Seamus is an eighteen-year-old fishing guide assigned to assist Father Declan at the Castle. Inexperienced and highly sensitive to the wretched weather and swarming midges, he frequently complains about the poor fishing conditions. His practical, cynical approach to the excursion contrasts sharply with Father Declan's intense focus.

Thomas Dunn is the head ghillie at the Castle, responsible for managing the fishing beats and enforcing estate rules. He is a voice of pessimistic realism, actively trying to discourage Father Declan from fishing by citing the swollen river and terrible weather conditions.

Catherine McPhillemy is a local woman in the rural Irish parish of Roonatellin. As a recognized widow, her social standing and the formal public notice of her husband's passing provide a template for the community's traditional expectations surrounding grief and marital status. She steps in to assist her neighbors during times of loss.

Father Daniels is the former parish priest of Roonatellin. Years ago, he served as the community figure who granted permission for two young newcomers to stay in a ruined local cottage, inadvertently helping them establish a lifelong, secluded sanctuary.