Though she is the eponymous character, Zelda's story role is often that of a damsel in distress or "donor" who assists Link. In many games, Zelda is captured by the antagonist Ganon, necessitating Link to come to her rescue. Some games have emphasized her magical abilities and importance to the functioning of Hyrule. In several games she is one of the Sages or Champions whose heroism is essential to defeating Ganon; in others she adopts alternative personas to take a more active role in the story. Zelda's alter egos include the ninja Sheik in Ocarina of Time and the pirate captain Tetra in The Wind Waker.