Deku Link
From Zelda Wiki.org
Deku Link is one of the forms Link assumes in The Legend of Zelda: Majora's Mask. After stumbling through the forest in a chase after Skull Kid, Link fell through a large hole leading to Termina. At the end of the hole, Link found Skull Kid wearing Majora's Mask, and was then cursed and turned into a Deku Scrub. Deku Link is believed to be the incarnation of the Deku Butler's son who was turned into a tree, possibly by the Skull Kid. Most of the people in game think Deku Link to be a young boy, and an adorable one at that. This opinion is not shared by the many dogs of the game, who will attack on sight. Madame Aroma comments that there is an elementary school where the Deku Butler's son may have attended.
Using the Deku Mask, Link is able to transform into Deku Link at any time. It can be said almost without argument that this transformation is Link's weakest. If Deku Link catches on fire he will, quite predictably, die instantly.
When using the Ocarina as Deku Link, it appears as the Pipes of Awakening, a number of wooden trumpet horns (which are held behind him) all attached to a mouth piece.

