Wind Fish

The Wind Fish is a character from The Legend of Zelda: Link's Awakening. He is a deity who has the physical appearance of a large whale with wings.

Biography
The Wind Fish is, despite its name, a large whale that sleeps inside an egg on the top of Mt. Tamaranch on Koholint Island. Early in Link's adventure, after his ship is destroyed and he finds himself on the island in the care of Marin, an Owl tells him that the only way to leave the island is to wake the Wind Fish by gathering the Instruments of the Sirens. Later, at the Face Shrine, Link discovered that this is because the island is the Wind Fish's dream. The Nightmares, beings of evil, yearn to stop Link from ever waking the Wind Fish, thus would they stay in control of the island for all time.

Eventually, Link gathers the Instruments and plays the "Ballad of the Wind Fish" in front of the egg, opening it. After fighting Dethl inside the egg, the Wind Fish appears and tells Link of how it had dreamed of the island, and due to his awakening, it has to disappear. However, he also tells him that the island will continue to exist in Link's memories. Both Link and the Wind Fish then awaken, with Link finding himself floating on the wreckage of his ship and seeing the Wind Fish flying overhead.

Theory
Fans have made speculation that the Wind Fish is actually the Ocean King from Phantom Hourglass. This is mostly due to the fact that the Wind Fish and the Ocean King are both Whales that look similar and rule over dream worlds.