Gooney Bird is a highly articulate, confident second-grader who moves to Watertower. She arrives at her new school with expressive fashion sense and immediately captivates her peers with detailed stories about her past. She values honesty and insists that all her seemingly outlandish tales are completely true.

Mrs. Pidgeon is an empathetic and flexible second-grade teacher at Watertower Elementary School. She encourages critical thinking by guiding her students rather than lecturing them, and she actively fosters an inclusive environment. She enthusiastically embraces Gooney's storytelling abilities and incorporates them into her lessons.

Malcolm is a second-grade student who initially struggles to pay attention and remains withdrawn in class. His engagement shifts when he begins listening to Gooney's captivating stories, prompting him to ask questions and participate in discussions. He occasionally experiences minor classroom mishaps.

Felicia Ann is a very quiet student in Mrs. Pidgeon's second-grade class. She spends most of her time looking down and avoiding participation, appearing to be lost in her own thoughts. She slowly absorbs the confident energy introduced by the new student.

Barry is an energetic and talkative student in Mrs. Pidgeon's classroom. He frequently has ideas he wants to share and often finds it difficult to wait his turn or keep quiet during lessons.

Keiko is a student in Mrs. Pidgeon's second-grade class. She is an observant member of the classroom dynamic who quickly notices and compliments the unique outfits worn by the new student.

Catman is Gooney Bird's beloved pet cat who accompanies her family on their move to Watertower. He is missing his tail due to a past lawnmower incident and possesses a highly curious nature.

Mr. Prinn is Gooney Bird's former next-door neighbor. He enlists Gooney's help when a minor crisis occurs at his home, recognizing her as a helpful observer in their neighborhood.

Napoleon is a black poodle belonging to the Prinn family. He has a habit of getting into trouble and wandering away from home to search for discarded food.