Sheik

Sheik is a character from The Legend of Zelda: Ocarina of Time. He appears frequently once Link is an adult to help him on his quest to awaken the Sages. Sheik is later revealed to be Princess Zelda.

Appearance
Being a member of the Sheikah, Sheik has the red eyes of the race, but blonde hair instead of the usual white. Only his bangs are seen through the bandages on his head and neck, however. Similar bandages are seen on Sheik's foremarms and fingers. Sheik wears a tight bodysuit in shades of blue, with a white chest emblazoned with the Sheikah's eye symbol. Although actually Zelda, Sheik has a muscular and masculine figure, and it's unknown whether Zelda just changed into a disguise or actually underwent some sort of magical change, as her eyes changed colors.

Biography
Sheik is the identity Princess Zelda assumed after escaping Hyrule Castle with Impa, her bodyguard. Sheik first meets with Link shortly after he awakens from his seven-year slumber, introducing himself as the survivor of the Sheikahs. Sheik is the one that explains Link's quest to awaken the Sages to him, and subsequently helps him on said quest. He tells Link that the Hookshot is needed to enter the temples, then stays behind near the pedestal. Sheik later appears when Link arrives in the Sacred Forest Meadow, teaching him the Minuet of Forest so that he can easily warp back to the spot before disappearing. When Link arrives near the Fire Temple, Sheik arrives and teaches him the Bolero of Fire to warp to the point before walking away, creating a wall of fire so that Link cannot follow. When Link arrives at Lake Hylia as an adult, Sheik is there, and he explains the icy curse over Zora's Domain, assuring Link that he has gotten Princess Ruto to safety. Sheik teaches Link another warp song - the Serenade of Water - and waits outside of the Water Temple until Link defeats Morpha and awakens the Sage, before leaving once more. At Kakariko Village, Link discovers that there is an evil force in the village, and sees Sheik already there. They encounter an evil spirit together, which defeats them. Sheik urges Link to help Impa fight the evil in the village, then teaches him yet another warp song- the Nocturne of Shadow. This marks the only time Sheik teaches Link two songs in a single encounter, as after informing Link that he must go back in time and teaching him how to do so, he teaches Link the Prelude of Light, which can warp him to the Temple of Time. At the entrance to the Spirit Temple, Sheik comes down from the rocks where he has been waiting for Link and teaches him one final warp song - the Requiem of Spirit. Once Link has awakened all of the sages, he congratulates him on his efforts and reveals his identity as Princess Zelda.

Trivia

 * Sheik appears in Hyrule Warriors and many Smash Bros. games.
 * One of Zelda's moves is actually transforming into Sheik.
 * Sheik is skilled at playing the harp, and all of the songs he teaches Link are on this instrument.
 * In the Minuet of Forest, Sheik's harp is heard playing along with the Ocarina, even if Sheik is not there.
 * The instrument, though called a harp, is indeed a lyre.
 * Although Sheik does not appear in Breath of the Wild, the Stealth Chest Guard and Stealth Tights appear to be based on him.
 * Sheik's Mask can also appear if the Sheik amiibo is used.