William's longtime caregiver and maternal figure, who gives him the castle as a farewell gift before returning to her hometown in England.

A toy soldier brought to life who assists William on a quest to reclaim his ancestral lands and offers mentorship and guidance.

A malevolent wizard who is the primary antagonist, using his powers to oppress and control others, including transforming Sir Simon and manipulating events for his own gain.

An elderly woman who was once Sir Simon's nursemaid and becomes a reluctant helper of Alastor; she provides crucial information to aid William's quest.

A young boy who encounters William in the forest and plays a supporting role by helping him communicate with Sir Simon.

A man who is freed from a magical curse by William, and who assists him by providing information to aid in his quest.

A creature transformed from a pet cat that guards the castle entrance, representing a challenge William must overcome.

William's loving but often absent parents, who begin to engage more in his life as the story progresses.

William's dedicated gymnastics coach, providing mentorship that helps prepare him emotionally for challenges both in gymnastics and his magical adventures.