A charismatic noir detective from a 1930s book series, who becomes entangled in Rainy's world and questions his own fictional reality.

Rainy's grandfather and a seasoned Book Witch who provides wisdom and support, deeply invested in Rainy's safety and well-being.

An apprentice Book Witch with a cheerful demeanor who secretly aids Rainy in uncovering mysteries about her life.

An antagonist and Burner committed to destroying books he deems unworthy, standing in opposition to Rainy and her mission.

The strict leader of the Ink and Paper Coven, who enforces its rules and frequently opposes Rainy's unorthodox methods.

The March family’s housekeeper, whose care and loyalty maintain order in the family home, hiding an unusual past.

A dual character as a local mystery writer and Rainy’s author, offering guidance and revealing deeper truths about Rainy's world.