Ocarina of Time
Called the "father of the forest" in The Legend of Zelda: Ocarina of Time
, the Deku Tree serves as the spiritual guide of the inhabitants of the Kokiri Forest. He is very old and very wise, and the Deku also serves as the first dungeon, as Link must rid the curse laid upon him by Ganondorf in the form of the dungeon's boss, the spider Queen Ghoma. Despite defeating the boss and finishing the dungeon, however, the Great Deku Tree dies after giving Link the Kokiri Emerald, and instructing him to bring it to Zelda. The demise of the Deku Tree does not mean Ocarina of Time takes place after Wind Waker, however, as returning to the Tree as an adult will reveal that a Deku Sprite has begun to grow in front of the remains of the Deku Tree.
In The Legend of Zelda: Wind Waker
, the Deku Tree takes on a new aesthetic and role. As the guardian of the Forest Haven, the Great Deku Tree protects the forest and the Koroks who live there. Removing the chu-chus that plague the area prompts the Deku Tree to give Link the Deku Leaf, a useful item to be used throughout the remainder of the game. A clue that this is the Deku Sprite from Ocarina of Time is how the Deku tree refers to Link's green tunic, recalling the days of old, and how the tree is able to speak the old Hylian language.
Tingle's Rosy Rupeeland
In Tingle's Rosy Rupeeland
, the Deku Tree returns once again as the guardian of the Deku Forest. The forest has become so polluted that it has made his heir, a small Deku sprout, very sick. In order to cure him, the Deku Tree requests that Tingle venture into the Deku Temple inside of the Tree to obtain the Life Dew. After paying a nominal fee, Tingle enters the temple and discovers that the Life Dew has been polluted. Tingle eradicates the source of the corruption, the tri-coloured plant Bana Bana, obtains the restored Life Dew and pours it on the young sprout. Just as his heir is restored to good health, leaves begin to fall from the Deku Tree. He dies shortly after giving Tingle a reward of up to 6000 rupees.