A royal princess who frequently runs away from the castle. She accidentally becomes trapped inside Jack's house when a magic bean sprouts, leading to their ascent into giant territory. After being captured and rescued by Jack, she escapes Gantua, is recaptured by Fallon, and is ultimately saved. She marries Jack following the victory over the giants.
Jack and Isabelle develop a romantic bond during their shared journey and eventually marry.
King Brahmwell is the father of Princess Isabelle.
Elmont serves as the royal captain tasked with protecting and rescuing Isabelle.
Isabelle is a strategic target for Roderick's political and magical ambitions.
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