King Gustaf

King Gustaf is an ancient King of Hyrule who ruled at the beginning of the Force Era. Gustaf is the oldest known ruler of Hyrule aside from its founder, the Goddess Hylia inhabiting the body of the first Zelda. By the time of The Legend of Zelda: The Minish Cap, Gustaf has been dead for a long time and appears as a ghost.

History
Not much is known from the time of Gustaf's rule, only that he is a King from the early Force Era who was especially attached to the peace of his kingdom and he apparently had very good relations with the Wind Tribe.

Many ages after his death, he appears before Link from beyond the grave when his kingdom is threatened by Vaati in order to help the young hero defeat the dark mage. Gustaf first appears before Link just after he retrieves the Water Element from the Temple of Droplets in Lake Hylia. He reveal to the young hero that he is an ancient king of Hyrule and that he must come find him in the Royal Crypt.

When Link reaches Gustaf's chamber in the Royal Crypt, Gustaf gives the young hero a Gold Kinstone Piece and instructs him to use it at the Source of the Flow in order to proceed beyond the stone door in Veil Falls. This allows Link to reach the Cloud Tops where the Wind Tribe currently resides, allowing Link to find the Wind Element guarded by them.

The Minish Cap Figurine
"The spirit of an ancient king of Hyrule who wishes to secure peace in his land from beyond the grave. He was very fond of the people of the Wind Tribe."