Flanagan is the broomstick instructor and stable master at Endor College for witches. He tends the college's broomstick fleet, instructing students in their use, organizing the stable, and repairing damaged brooms.

When Mary arrives possessing a broomstick and accompanied by a cat, Flanagan mistakes her for a new student. Demonstrating a calm, methodical demeanor, he strictly adheres to broomstick storage and maintenance rules. After securing her broom, he directs Mary to her classes.

Depicted as an anthropomorphic fox, Flanagan is the sole talking animal observed at Endor College. His exact origins are unspecified, though his presence hints at possible connections to the college's magical experiments. He may represent a successful transformation outcome or a permanent member of the magical staff.

Later, Flanagan repairs Mary's damaged broomstick off-screen. This voluntary action enables her escape and rescue mission, though his specific motivations for helping Mary and Peter remain undetailed. His accurate identification of Mary as a witch, based on her innate magical potential rather than temporary enchantment, reveals perceptiveness regarding magical abilities.

Information about Flanagan's background, personal history, or development beyond these events is unavailable. His role centers on his broomstick stable responsibilities and indirect support of the protagonists during their escape.