Arsinoe is a 16-year-old naturalist triplet queen raised by the Milone family in the impoverished region of Wolf Spring. Widely considered powerless because her animal familiar has not appeared, she faces immense pressure as the Ascension Year begins. She prefers wearing black slacks over traditional queenly dresses and is fiercely protective of her friends, even risking her own safety to protect them.

Mirabella is a 16-year-old elemental triplet queen raised in Rolanth. Backed by the powerful Temple priestesses, she is the only sister with a visible gift, making her the favorite to win the crown. Despite her immense power, she is inherently peaceful, harboring a deep desire to reconnect with her sisters rather than kill them.

Katharine is a 16-year-old poisoner triplet queen raised by the wealthy Arron family at Greavesdrake Manor. Small and frail from years of ingesting toxins to build an immunity she lacks, she is anxious about her perceived weakness. She relies heavily on her guardians to conceal her lack of power from the public.

Jules is the strongest naturalist in Wolf Spring in 60 years. She serves as Arsinoe's fiercely loyal confidante and protector. Guided by her deep devotion to the queen, she actively searches for ways to help Arsinoe survive the upcoming battle for the throne.

Luca is the High Priestess of the Goddess's temple in Rolanth. She oversees Mirabella's daily life and elemental training, intending to ensure the young queen takes the throne. She uses religious doctrine to mask her political ambitions and maintain the Temple's authority.

Natalia is the formidable leader of the Arron family and a prominent member of the Black Council. She acts as Katharine's foster mother, pushing the young queen through brutal regimens to secure their family's continued dominance over the island.

Pietyr is Natalia's politically savvy nephew. He offers to train Katharine in the art of seduction to make her appealing to mainland suitors. During their private lessons, he works to build her confidence and unexpectedly develops feelings for her.

Joseph is a young man who was exiled as a child for helping Arsinoe attempt an escape from the island. His return to Fennbirn brings joy to his childhood friends but quickly leads to complicated romantic entanglements.

Madrigal is Jules's mother and a member of the naturalist community. Desperate to force Arsinoe's gift to manifest, she experiments with dangerous low magic, risking unintended consequences for those around her.

Billy is a suitor from the mainland who visits Fennbirn for the Ascension Year. He breaks tradition by integrating himself into the island's affairs and forms a genuine bond with Arsinoe.

Genevieve is Natalia's sister and a strict member of the Arron family. She assists in Katharine's brutal poisoner training, applying painful tinctures to harden the young queen.

Rho is a severe priestess at the Rolanth temple. She doubts Mirabella's resolve and actively pushes for violent, decisive measures to ensure the elemental queen claims the throne.

Sara is Mirabella's foster-matron in Rolanth. She maintains the Westwood household and strictly follows the Temple's directives regarding the elemental queen's upbringing.

Bree is Sara Westwood's daughter. She lives closely with Mirabella, enjoying the personal freedoms that the carefully guarded queen is denied.

Elizabeth is a temple initiate and a loyal friend to Mirabella. Unusually, she is a naturalist permitted to keep her animal familiar while serving the Temple.

Camille is the former queen of Fennbirn and the biological mother of Mirabella, Arsinoe, and Katharine. Per Temple doctrine, her daughters are raised completely separate from her.

Sweetheart is Katharine's pet coral snake. Kept in a glass cage, she provides the anxious poisoner queen with a small measure of comfort.

Camden is Jules's animal familiar. As a massive mountain cat, Camden reflects the extraordinary strength of Jules's naturalist abilities.

William is Billy's father, a mainland businessman who maintains a secret, strategic understanding with the Arron family.

Cait is Jules's grandmother and an elder in the Milone family. She applies healing salves to Arsinoe's injuries after magical mishaps.

Ellis is Jules's grandfather. A skilled craftsman in Wolf Spring, he provides practical support to his family and the queen.

Luke owns a bookshop in Wolf Spring. He is a naturalist accompanied by a molting rooster familiar, offering a safe haven for the queen's inner circle.

Hank is a molting rooster and the animal familiar of Luke, the bookshop owner.

Caragh is Madrigal's sister and Jules's aunt. She lives in isolation as the solitary midwife and nurse to the queens.

Matthew is Joseph's older brother. He maintains a close relationship with the Milone family.

Renata is a member of the Black Council representing Wolf Spring. She formally announces Joseph Sandrin's return from banishment.

Giselle is a maid at Greavesdrake Manor. She carefully assists Katharine following the young queen's grueling training sessions.