Briseis is a Black teenager with a secret magical ability to control plants. She often struggles to hide this power, which has caused social and academic isolation in Brooklyn. After unexpectedly inheriting a rural estate, she hopes to help her family financially while learning more about her abilities and biological heritage.

Thandie is one of Briseis's adoptive mothers and the co-owner of a financially struggling flower shop. She is naturally cautious and tends to be a pessimist, often prioritizing safety and practicality. Despite suffering from intense plant allergies during the family's stay in Rhinebeck, she remains steadfastly supportive of Briseis.

Angie is Briseis's other adoptive mother. She contrasts with her wife by being highly optimistic and impulsive. She encourages Briseis to explore her powers and openly supports her daughter's desire to learn more about her biological family, ensuring Briseis never feels guilty for her curiosity.

Karter is a local teenager who works at a bookstore in Rhinebeck. He quickly forms a bond with Briseis over their mutual understanding of small-business struggles and overworking parents. He becomes one of her first friends in the small town, offering a welcoming presence in an unfamiliar place.

Marie is a wealthy young woman living in Rhinebeck. She introduces herself as a relative of Alec Morris and quickly captures Briseis's attention with her striking appearance and self-assured demeanor. She possesses extensive knowledge of local history and the area's arcane traditions.

Mrs. Redmond is the estate attorney responsible for executing the will of Briseis's biological aunt. She facilitates the family's move to Rhinebeck by providing the keys and initial instructions for the property. She maintains a tense, strained dynamic with her son.

Circe is Briseis's deceased biological aunt. She ran a local apothecary in Rhinebeck and left behind a massive estate filled with mysterious letters, locked gardens, and clues about her family's botanical legacy.

Selene is Briseis's biological mother, who died shortly after Briseis's adoption was finalized. She was a talented illustrator who documented poisonous plants and worked alongside her sister in the family apothecary.

Dr. Grant is a Public Safety Officer and social worker in Rhinebeck. She serves as a community-focused alternative to traditional police and promises to keep the Greenes safe as they settle into their new, isolated home.

Alec is an older Rhinebeck resident who searches the Colchis property for rare medicinal plants to treat his diabetes-related ailments. He is highly educated in classical languages and ancient texts.

Isaac is an older local resident who visits the newly reopened Colchis apothecary. He understands the area's magical community and helps Briseis test the limits of her transfiguration abilities.

Gabby is Briseis's former close friend from Brooklyn. Their relationship cooled after Gabby learned brief, unsettling details about Briseis's plant-related abilities, representing the social cost of Briseis's secret.

Professor Kent is a curator and classics professor. She provides Briseis with crucial historical context regarding the myths of Medea and Hecate, explaining how ancient texts were often shaped by the biases of their authors.

Nyx is an intimidating woman who serves as Marie Morris's driver and personal bodyguard. She is highly protective of her employer and offers Briseis vague but genuine advice about the local community.

Lucian, who goes by Lou, is the local coroner and undertaker in Rhinebeck. He holds extensive, memorized knowledge regarding the violent history of the Colchis family and the town's covered-up deaths.

Mama Lucille is an elderly local woman who practices rootwork and magic. She becomes one of the first regular customers at the revived apothecary, purchasing supplies for her spellcraft.