Sheikah

The Sheikah is an ancient clan of ninja-like warriors sworn to protect the Hylian Royal Family, even after death; as such they came to be known as "the Shadows of the Hylians". They were skilled in magical and combative art.

They were assumed that many have died during Hyrulean Civil War (as states a Gossip Stone).They have become rare after the Imprisoning War, and were presumed extinct after the Great Flood.

Characteristics
Much like Humans other than the traditional clothing that they wore are almost identical to Hylians externally and the only known difference between Hylian and Sheikah biology so far are the Sheikahs eyes that are blood red in color.

Is presumed that they were Hylians beacuse they have their distinctive pointed ears and beacuse they can use magic, a most notable example/fact is Sheik whos alter ego was Zelda a native Hylian.

Young males pierced their ears as a traditional rite of passage. Not much is known about their lifespan or other details about their lives. There is no statement of a male Sheikah except Sheik whos sex is debated by many fans.

They have the tradition of passing history and "forthcoming" legends trough generations as quotes Sheik:
 * ...Together with the Hero of Time, the awakened ones will bind the evil and return the light of peace to the world. This is the legend of the temples passed down by my people, the Sheikah..."

The Sheikah Emblem
The emblem of the Sheikahs consist in an big eye in the center, with three triangles above (as if to imitate eyelashes and/or symbolize the pieces of the Triforce) and below a big teardrop to possile show mourn for the dead.

According to the official Legend of Zelda: Ocarina of Time manga (which is a non-canon source) tells that the simbol was used before with a single eye until the betrayal of the Royal Family.

The Legend of Zelda & The Adventure of Link
Theres is a character named Impa but she has nothing to despict her as Sheikah. The Sheikah are introduced for first time in The Legend of Zelda: Ocarina of Time

The Legend of Zelda: A Link to the Past
The wizard Agahnim has an eye symbol (is believed to be a Sheikah emblem) on his robe and throughout his lairs.

The Legend of Zelda: Ocarina of Time
The Sheikahs are first introduced in The Legend of Zelda: Ocarina of Time.

They were outcasts and feared in Hyrule perhaps for this very reason, and are presumed to have moved away from the Hylians to another region beyond the mountains, mostly believed that they left at the Hyrulean Civil War.

The first intoduced Sheikah in the game was Impa, the maid of Princess Zelda, she knows about the old prophecies as knew that Link will go to the castle. She have a lot of information about the Royal Family as she teach Link the Zelda's Lullaby (a song only for people close to the Royal Family).

Impa was born and raised in Kakariko Village, that was before, the village of the Sheikahs as states a Soldier at the village:
 * This used to be the great Impa's house, but she doesn't live here any longer. It is now open to all villagers. You are free to go on in. This village used to be a Sheikah village, but the great Impa opened it to everyone.

Impa at the end of Ocarina of Time she becomes the Sage of Shadow

The next introduced Sheikah is Sheik, who is Princess Zelda alter-ego, he/she helps Link in his quest for the Six Medallions, teaching Link teleporting songs to the Temples and telling him where to go next. Probably after Zelda has taken away of the castle by Impa, she learned from her maid of the Sheikahs kwoledge and techniques.

Another notables appearences of the Sheikahs are:
 * The Gossip Stones that have a Sheikah emblem engraved (without the teardrop), possibly a way to comunicate with the Royal Family.
 * The Mask of Truth have a Sheikah emblem (without the teardrop), is used to talk with the Gossip Stones.
 * The Lens of Truth have a Sheikah emblem, is used to see invisible things.
 * There are Sheikah emblems in the Shadow Temple, this is believed to be their temple.
 * The Graveyard in Kakariko Village have a big sign that says that there rest in peace the deads of the Royal Family and Sheikahs.

The Legend of Zelda: Majora's Mask
There are no Sheikahs in Termina but there are Gossip Stones with the Sheikah emblem and Kafei have distinctive red eyes. The Happy Mask Salesman seems to have red eyes (when angered), but they appear to just be bloodshot.

The Legend of Zelda: Oracle of Seasons & The Legend of Zelda: Oracle of Ages
In the Oracle Games appear a character called Impa who helps you in both games and is the nursemaid of Princess Zelda. There is no statement that is a Sheikah but in the artworks of the game she have red eyes and pointed ears.

The Legend of Zelda: Wind Waker
The Sheikah are presumed exticnt in Wind Waker but the Sheikah emblem makes a cameo in the Forsaken Fortress where is seen inside the room at the top. Baito, the mailman has the Sheikah emblem tattooed on his back. Impa make an apparence in the basement in the Hyrule Castle despicted in one of the stained glass windows with a Sheikah emblem above her.

The Legend of Zelda: Twilight Princess
In Twilight Princess, Impaz, the last living member of the Hidden Village, has red eyes and tells Link she is named after the village's founder (Impa maybe). She also claim's her bloodline to be protectors of the Royal family. It is likely that Impaz is the last living Sheikah, or perhaps is Impa herself. Another references are:
 * The robes where Princess Zelda hides his face the first time you see her have the Sheikah emblem.
 * "Shoulder pads" of Zelda have a Sheikah emblem, the eye is a blue gem.
 * The Howling Stones have a Sheikah emblem. Probably they were Gossip Stones.
 * Madame Fanadi, the fortuneteller wears the Sheikah emblem on her forehead, have red eyes and pointed ears, is probable a Sheikah.
 * Sheikah symbol is on the back of Midna's helmet.
 * There is a Sheikah symbol above Zant's throne.

Sheik does not appear in TP but according to the Super Smash Bros. Brawl official site, Sheik was originally supposed to appear in Twilight Princess, but this idea was later scrapped. Her TP model was used in Super Smash Bros. Brawl.

Some fans theorise that the Twili race of The Legend of Zelda: Twilight Princess are connected to the Sheikah, as both are dark magic practitioners, possessing red eyes and a very similar tribal symbol. Some even go as far to say that the Sheikah are the 'dark interlopers' from whom the Twili are descended, as, being so close to the Royal Family, they would know much of the Triforce.

Sheikah