Terlu is a librarian in her twenties with curly brown hair, purple eyes, and lavender-tinted skin. Originally from the sun-drenched island of Eano, she sought purpose and companionship at the Great Library of Alyssium, only to find deep isolation. After awakening from a six-year petrification spell on the snowy, remote island of Belde, she cautiously explores her new surroundings. She is resourceful and highly affectionate, struggling with her lingering fear of punishment while trying to help the inhabitants of the enchanted greenhouse.

Yarrow is an expert gardener with gold-and-black hair and emerald eyes who tends to the sprawling, failing greenhouse complex on Belde. Abandoned by his family and left entirely alone for two years, he dedicates all his time and energy to keeping the plants alive. Though initially reserved and laconic, he communicates his care through practical actions like baking honey cakes and providing a safe shelter.

Lotti is a sentient resurrection rose created by the sorcerer Laiken. Having spent decades in an enchanted dormancy, she wakes up disoriented and desperate to reunite with the other sentient plants in the greenhouse. She is fiercely loyal to her creator despite his flaws, possessing a strong-willed, authoritative personality that masks her fear of being powerless.

Laiken is the brilliant but deceased sorcerer who built the Enchanted Greenhouse of Belde. He originally created the marvels of the complex for his ailing daughter, but grief and paranoia eventually overtook him. In his later years, he isolated himself, drove away his staff, and cast his sentient plant creations into suspended animation out of a misguided desire to protect them.

Birch is an elder gardener and Yarrow's father. He previously maintained the greenhouse complex alongside Laiken but eventually departed the isolated island, a decision that severely damaged his relationship with his son. He carries guilt over his choices and struggles to communicate his regrets effectively.

Rowan is Yarrow's sister who left Belde several years ago to help her aunt and uncle in Alyssium and to attend university. Her departure created physical and emotional distance from her brother, though she maintained an unreciprocated effort to contact him through letters.

Ambrel is Rowan's wife, having met her while they were both at university. She provides emotional support to Rowan as her spouse navigates the complicated family dynamics surrounding the isolated greenhouse.

Rijes Velk is the head librarian at the Great Library of Alyssium. She is a compassionate superior who tries to protect her staff, ultimately sending Terlu to Belde with a spell to break her petrification and a hope that the former librarian can find a new path.

Marin is a sailor who navigates the waters of the Crescent Islands. She provides the only regular contact between the isolated island of Belde and the outside world, bringing supplies and occasionally delivering messages or passengers.

Caz is a spider plant that Terlu brought to life out of severe loneliness while working at the Great Library. His existence triggers the main events of the story, as Terlu's act of magical creation leads directly to her arrest and subsequent exile.

Emeral is a gray cat with emerald wings who resides in the enchanted greenhouse. When the rest of the winged cats departed Belde with Rowan, Emeral chose to stay behind, providing Yarrow with silent companionship during his years of isolation.

Dendy is a sentient rhododendron who was once close friends with the sorcerer Laiken. After spending decades in an enchanted dormancy, he wakes up eager to assist the human caretakers and mediate between the plants and the gardeners.

Ria is Laiken's daughter, a young woman who suffered from illness but dreamed of traveling the world. The entire greenhouse complex was originally constructed by her father as a gift to keep her entertained and safe on the island.

Rorick is Yarrow's uncle, a former resident of Belde. He is responsible for a severely traumatic event in Yarrow's childhood, having left the young boy alone in the caves beneath the greenhouse for three days to teach him independence.

Cerri is Terlu's sister who lives on the sun-drenched island of Eano. She is highly capable with tools and repairs, leading Terlu to frequently think of her when faced with the physical labor required to fix the abandoned cottages on Belde.