Hero's Spirit

The Hero's Shade is a character from Twilight Princess who teaches Link the seven Hidden Skills. The Hero's Shade is very skilled with a Sword, and he is missing one eye. He appears to be similar to a Stalfos in appearance.

The Hero's Shade is the spirit of an ancient warrior who once saved the land of Hyrule. He wishes to pass on his skills to Link, a member of his bloodline. He has the ability to turn in to a golden wolf, similar to how Link turns into a wolf in the Twilight. He is first seen in this form outside of the Forest Temple. After their first encounter, Link can meet him by howling at a Howling Stone, where they will howl a duet in wolf form. A symbol will then appear on Link's map where he can find the golden wolf, who will attack him and warp him into a strange, foggy dimension with a faint outline of a castle in the background. The shade will then appear in his true form and teach Link a skill.

In Hyrule Historia, it is revealed that the Hero's Shade is actually the Hero of Time, Link, from Ocarina of Time.