Leaf

Leaf, the Fairy of Power, is a red spirit fairy and a servant of the Ocean King in The Legend of Zelda: Phantom Hourglass. He is obtained upon defeating Blaaz. When ten Power Gems are gathered and offered at Spirit Island, Leaf can be used. He uses his power to ignite Link's sword with flames that double Link's attack strength, and he quadruples it when twenty Power Gems are offered at the Spirit Island.

Trivia
In Phantom Hourglass, Leaf is the only fairy who is male.