Fairy

Fairies are a common character in the Legend of Zelda series. They usually restore health or provide an extra life. They originated in The Legend of Zelda. A Great Fairy can heal Link, give him an extra power, or upgrade his items.

The Legend of Zelda

 * In The Legend of Zelda, fairies simply heal Link whenever he finds them. They are indistinguishable from Great Fairies, with the exception of Great Fairies being found by ponds.

Ocarina of Time

 * In The Legend of Zelda: Ocarina of Time, fairies either heal Link or provide an extra life. They can be kept in a bottle.

Four Swords Adventures

 * In The Legend of Zelda: Four Swords Adventures, Force Fairies provide extra lives and are acquired throughout the game, including upon the completion of a level.