Rauru

Rauru is the Sage of Light from Ocarina of Time. He is the sixth sage after those of Forest, Fire, Water, Shadow, and Spirit, whose role in the game played out before the events of it. He appears to Link a few times in his owl form, Kaepora Gaebora, to give him advice, and also keeps him safe during his seven-year sleep in the Sacred Realm.

Appearance
Rauru is an older man with scarce white hair and a large mustache. He has blue eyes and tanned skin, and wears a long orange and white robe with red accents, as well as a Triforce symbol in the middle.

In-game
Long before the events of Ocarina of Time, but shortly before Hyrule establish a Royal Family, Rauru, the Sage of Light, built the Temple of Time over the Sealed Temple in Faron Woods, to protect the Triforce from the evil forces who wanted to steal it and take over the land with evil, such as Ganondorf. He named it after the Temple in Skyward Sword-era mythology about the Hero of Time wielding the Master Sword and traveling through time, legends that would come true in Ocarina. Rauru himself stayed in the Temple of Light, which is located inside the Sacred Realm, leaving only in the form of the wise owl Kaepora Gaebora to watch over Hyrule and, later on, give Link advice. The Sheikah tribe then learned of the Sages and Sacred Realm, and Rauru was slowly forgotten. . He later appears to encourage Link and give him advice about his quests many times throughout the course of the game in his owl form, and twice offers to carry him where he needs to go if he thinks Link cannot progress on his own. He appears one final time at the Spirit Temple, giving him advice about Twinrova. Rauru returned to the Chamber of Sages, protecting it from becoming corrupt with evil after Ganondorf stole the Triforce of Power while Link slept. He also kept Link safe while he slept, and when he awoke, he introduced himself and explained what had happened to Hyrule and how Link can save it. He tells Link to awaken the Sages, and gives him the Light Medallion. After Link awakens the Sages, Rauru contacts him and tells him to meet someone at the Temple of Time. This turns out to be Sheik, who reveals herself to be Princess Zelda, the seventh Sage. Rauru tells Link that he and the other sages will help him enter Ganon's Castle, and then makes one final appearance when he leads the other sages in using their powers to seal Ganondorf away in the Sacred Realm.

Trivia

 * Hyrule Historia confirmed Rauru and Kaepora Gaebora's connection.
 * A window in Wind Waker portrays Rauru and the other Sages from the game.
 * A Gossip Stone mentions the rumor of Rauru and Kaepora Gaebora's relationship.