Navi

Navi (ナビィ, Nabi) is Link's fairy from Ocarina of Time. Her name is thought to be short for Navigation. Since Link is not a real Kokiri and does not have a fairy of his own, she is summoned by the Great Deku Tree to accompany Link on his quest to save Hyrule. The precise relationship between her and Link is a matter of contention, since it is left ambiguous by Nintendo - the only time she speaks during the game (with the exception of the "Hey" and "Listen" sound effects) is during the introductory sequence and during the Temple of Time sequence. At the end of the game, when Link returns to his original time, she leaves him and flies away for undisclosed reasons. She was last seen flying into the large window behind the Pedestal of Time. This is interesting since in Twilight Princess, it is concluded that the dungeon entrance is the exact same window from Ocarina of Time.

It is widely speculated that the "friend with whom he parted ways when he finally fulfilled his heroic destiny", mentioned in the introductory sequence to Majora's Mask is Navi. This is made all the more probable given the "fairy flying" sound-effect that is played after the text disappears off the screen, but before the Lost Woods scene begins. She has not been seen in any other Zelda games other then the Wii version of Twilight Princess, where she acts as a simple cursor.

In gaming terms, her primary purpose is to function as a focusing target, indicated by her position which object/enemy will be locked on to if the Z-trigger is depressed, as well as dispense hints to the player. She glows yellow to indicate when she is targeting an enemy, blue when you can talk to someone from a distance, and green when she is targeting something of interest.

Reception
Navi is one of the more criticized The Legend of Zelda series characters. Some gamers become annoyed with her frequent "Hey!" and "Listen!" sound effects.

Trivia

 * Ciela from Phantom Hourglass uses two of the same voice clips as Navi (her "Hey!" and "Look!" clips).