Nabooru's Second-in-Command

Nabooru's second-in-command is a character in Ocarina of Time who remains unnamed throughout the game. While Nabooru is away in the Spirit Temple, she leaves her second-in-command in charge of Gerudo Fortress. After freeing all the carpenters she will appear, complimenting Link on accomplishing such a thing and give him the Gerudo Membership Card which allows him to walk about freely in the Gerudo Fortress and access the Haunted Wasteland.

She is the Hyrulean counterpart of Aveil. 

Trivia

 * The color of her clothes change to match what Link wears, even during the battle.
 * Some people believe her to be the same person who fights Link before freeing each of the carpenters.