Dr. Willa Watters is a celebrity child psychologist who has achieved success through books and a podcast. Seeking refuge following a disastrous, highly publicized on-air breakdown, she returns to the small Louisiana town where she spent her childhood summers. Willa struggles with unresolved anger and relies on unhealthy coping mechanisms, but she channels her experiences into deep empathy for her clients.

Krystal Lynn Watters is Willa and Mabry's mother, currently living in a care facility. During Willa's youth, Krystal Lynn struggled with untreated bipolar disorder and self-medicated with alcohol, creating a chaotic home environment. She often involved Willa in questionable situations, including asking her daughter to dump a red convertible into the bayou years ago.

Mabry Watters is Willa's younger sister. Born with fetal alcohol syndrome, she experiences developmental difficulties and lacks emotional regulation. Willa acted as her primary caretaker during their turbulent childhood, establishing a code word for Mabry to use when she felt unsafe. The two sisters are currently in the middle of a serious disagreement.

Travis Arceneaux is a local law enforcement officer in Broken Bayou and Willa's teenage sweetheart. Handsome and charming, he understands Willa's difficult past because he grew up in an equally troubled, marginalized household. He investigates the town's missing women and shares a secret with Willa about the night she dumped her mother's car.

Ermine Taylor is a kind, stable local woman who runs Taylor's Marketplace. During Willa's difficult childhood summers, Ermine stepped in as a surrogate mother figure, offering compassion and normalcy. She remains a trusted confidante for Willa as tension rises in the community.

Rita Meade is a national news reporter covering the discovery of bodies in the bayou. Intelligent, persistent, and ruthless in her pursuit of the truth, she frequently questions the locals and law enforcement. Her polished appearance and outsider status make her a target of suspicion in the insular community.

Doyle Arceneaux is one of Travis's brothers. He has a rough, unkempt appearance and a reputation that leads many townspeople to view him with suspicion. He shadows Willa around town, leaving her unsettled and wary of his intentions regarding the local murder investigation.

Eddie Arceneaux is Travis and Doyle's brother. He is developmentally disabled and mostly non-verbal, a condition rumored to be linked to his mother's harmful home remedies. Eddie spends his time making metal figurines and possesses a quiet, seemingly harmless demeanor.

Amy Owens is Willa's best friend and podcast co-host. Having grown up with a mother who struggled with alcohol addiction, Amy spent many childhood nights at Willa's house, forging a deep lifelong bond. She operates as Willa's professional manager and sounding board from afar.

Liv Arceneaux is the matriarch of the Arceneaux family. She lives in a filthy, hoarder-like environment and becomes fiercely defensive when questioned about her family. Her abusive parenting and struggles with mental health conditions severely impacted all of her children.

Emily Arceneaux is the sister of Travis, Doyle, and Eddie. She was a happy girl before her mother withdrew her from school, claiming she was gravely ill. Her subsequent death under mysterious circumstances remains a taboo subject of gossip in Broken Bayou.

Raymond St. Clair is a local man who works at the police impound lot and previously served as an EMT. He was part of the group of youths Willa knew during her summers in Broken Bayou. Quiet and observant, he warns Willa to be careful as the murder investigation unfolds.

Charles is the lawyer who handled the estate of Willa's great aunts. He is a concerned father trying to locate limited healthcare resources in his rural community for his young, partially non-verbal son who has autism.

Zeke Johnson is a bookie who always wore a black cowboy hat. He employed Krystal Lynn during a summer years ago and operated out of an office in town. He is central to the mystery surrounding the night Willa was asked to push her mother's red convertible into the bayou.

Walter Delaroux is an older resident of Broken Bayou whose land borders the water. He becomes the prime suspect in the serial killer investigation when bodies are discovered in barrels identical to ones he reported missing from his property.