Valoo

Valoo is a character from The Legend of Zelda: The Wind Waker. He is the almighty Sky Spirit who resides at the top of Dragon Roost Mountain and protects the Rito people that dwell on Dragon Roost Island. Valoo speaks the ancient Hylian Language, and only Prince Komali's Grandmother could fully understand him prior to her death. His attendant during the events of The Wind Waker, Medli, even has trouble understanding him. Interestingly, on a second play through of the game, Valoo's words are subtitled in Modern Hylian, or, from the player's perspective, English.

Valoo grants the Rito their wings by giving them one of his scales when they come of age and always protects them from harm.

Biography
Prior to the the events of The Wind Waker, Valoo's attendant is Prince Komali's Grandmother. She would look after him, but she died in a way unknown to the player.

When Link first visits Dragon Roost Island, he learns that Valoo is in a bit of a predicament. After Link climbs to the summit, Medli concludes that something is harassing Valoo. In fact, he is being tortured by the tremendous monster, Gohma, hidden within the mountain, beneath Valoo's high peak. Link must defeat Gohma in order to obtain Din's Pearl from Prince Komali.

Later, Valoo lays waste to Ganondorf's headquarters at the Forsaken Fortress by releasing a massive fiery breath, right after Quill and Komali saves Link and Tetra from Ganondorf's clutches.

Theory
Valoo bears striking resemblance to a character from Paper Mario: The Thousand Year Door named Hooktail. Like Valoo, she is a large red dragon with very small wings and a hook on her tail. Because of this, it is possible that Hooktail was inspired by Valoo.

Also, Valoo may have some relation to Volvagia since it is thought by some that Death Mountain became Dragon Roost Mountain. The two are also red dragons with a slight resemblance.