An accomplished professor and mentor who introduces the Potter children to the world of Whangdoodleland, emphasizing the importance of imagination and serving as their guide.

Lindy’s older brothers; Ben is mature and thoughtful, while Tom is more impetuous, though both care deeply for their sister during the journey.

Acts as the primary antagonist for much of the story, opposing Savant's and the children's efforts, but has a nuanced character that evolves through the narrative.

A whimsical creature that embodies imagination, he lives in Whangdoodleland and interacts with the main characters, revealing themes of belief and trust.

Include a variety of fantastical beings who either aid or challenge the protagonists, such as the helpful Whiffle Bird and the initially antagonistic Splintercat.