Eustace Scrubb is the C.S. Lewis character transformed into a dragon in The Voyage of the Dawn Treader.
Eustace begins the novel as an unpleasant, self-centred boy who dislikes adventure and resents being drawn into Narnia. During the voyage, he enters a dragon’s hoard, becomes obsessed with its treasure, and is transformed into a dragon himself.
The transformation becomes a major turning point. Aslan helps Eustace understand the moral meaning of what has happened, and Eustace changes through humility, friendship, and service to the ship’s company. He eventually returns to human form, though the experience permanently changes his character.
Readers sometimes confuse Eustace with Reepicheep, the courageous talking mouse, or with Prince Caspian, who commands the ship. Eustace later appears in The Silver Chair, making him one of the few major Narnia characters to feature in more than one later chronicle.