Sheik is a character in The Legend of Zelda: Ocarina of Time, who is an alter ego of Zelda. In the game, Zelda passes herself off as a Sheikah known as "Sheik" to hide from Ganondorf. With voice muffled and face concealed, as well as wearing a form-fitting blue suit with the red Sheikah eye in the center, the character is essentially unrecognizable as Zelda.
Sheik plays the harp and teaches Link new songs to help him on his quest. When Link arrives at the Temple of Time near the end of the game, Sheik uses the Triforce of Wisdom and reverts to Zelda. It is claimed by the character's trophy in Super Smash Bros. Melee that she uses her magical skills to change her skin tone, hair length, eye color, and clothing. In addition, Sheik is voiced by a female voice actor in Ocarina of Time, Super Smash Bros. Melee and Super Smash Bros. Brawl. However, when Link encounters Princess Ruto in the Water Temple, she asks Link to thank Sheik for saving her, referring to Sheik as "him", and in the non-canon manga for Ocarina of Time suggests that Zelda used the Triforce of Wisdom to actually become male while disguised as Sheik, and sealing away the consciousness of Zelda.