Father Tyler Bell is a 29-year-old Catholic priest who leads the congregation at St. Margaret's in Weston, Missouri. Raised in Kansas City, he joined the priesthood following a devastating family tragedy and strictly adheres to his vows. He maintains a down-to-earth demeanor by listening to early Britney Spears music and engaging with pop culture, but a new parishioner tests his strict commitment to religious rules.

Poppy is a financially independent woman who holds an MBA from Dartmouth but rejected the prestigious East Coast life her wealthy parents planned for her. She works remotely from Weston as a financial and marketing advisor for an exclusive adult entertainment venue in Kansas City, where she previously worked as a dancer. She feels comfortable with her sexuality and seeks spiritual clarity, immediately drawing the attention of the local priest.

Sterling is an affluent, arrogant man from Poppy's past who gave her her first kiss. Though he married someone else to fulfill his narrow, classist image of a wife, he views Poppy as an object he wishes to possess. He operates with intense entitlement and refuses to accept rejection.

Millie is the older, technically proficient bookkeeper at St. Margaret's. As one of the first female engineers in Missouri, she brings a blunt, perceptive, and motherly attitude to her work. She frequently advises Tyler and quickly notices the changing dynamics between him and Poppy.

Jordan is a traditionally minded Catholic priest based in Kansas City who serves as Tyler's personal confessor. He lives a highly disciplined, monk-like life devoted heavily to prayer. Despite his strict adherence to church tradition, he maintains a compassionate stance toward others' spiritual struggles.

Sean is Tyler's older brother, living in a penthouse in Kansas City. He exhibits a crass but playful masculinity and regularly jokes with his younger sibling. He continues to process the grief of a major family tragedy through loud music and physical exertion.

Aidan is Tyler's younger brother, two years younger than Sean. He shares a jocular relationship with his brothers and represents the down-to-earth family life Tyler returns to on his days off.

Ryan is the youngest Bell sibling, currently a teenager. He interacts playfully with his older brothers and rounds out the loud, masculine dynamic of the surviving Bell children.

Lizzy is Tyler's deceased older sister. Her tragic death by suicide at age 19, following abuse by a local parish priest, deeply traumatized the Bell family. Her memory heavily influences Tyler's strict dedication to his vocation and his desire to bring purity to his role.

Mrs. Bell is Tyler's mother. The loss of her daughter deeply traumatized her, and she relies heavily on the emotional support of her sons. She remains an understanding mother who encourages her children to establish their own independent lives rather than stay bound to family grief.

Mr. Bell is Tyler's father. Following the tragedy involving his daughter Lizzy, he threw out her belongings to avoid painful reminders, a coping mechanism that contrasts with Tyler's desire to preserve her memory through items like her rosary.

Rowan is a math teacher in Weston and serves as Tyler's only regular, constant penitent. He frequently confesses to feelings of envy and lust, prompting Tyler to offer thoughtful, personalized guidance rather than mechanical penance.

Bishop Bove is Tyler's superior in the Catholic Church hierarchy. He praises Tyler's work at St. Margaret's and pushes for his involvement in church panels, aiming to move past the scandals caused by the parish's previous priest.