Fairy

Small Fairies
Fairies are very small and can fly. In some Zelda games they take the form of small orbs of light; in other games they take the form of tiny humans. They possess a great deal of healing power. Some fairies are assigned to Kokiri as their partners by the Great Deku Tree, while others stay in Fairy Fountains and wait for weary travelers.

Companions
In Ocarina of Time, Link is assisted by Navi, who helps keep him on track by reminding him where to go. She also helps him target objects and enemies, and can provide information about enemies.

In Majora's Mask, Navi is replaced by Tatl, a new fairy who serves the same purpose as his previous fairy.