Fi

Fi (Pronounced, ) is a character featured in Skyward Sword who is the humanoid representation of the Goddess Sword. Fi is the spirit within the sword who guides Link during his adventure, serving as the young hero's companion in the game.

History and Abilities
The goddess Hylia created the Goddess Sword and Fi, an intelligent humanoid spirit who resides in the sword, and gave it the purpose of assisting Hylia's chosen hero in fulfilling his destiny. She then enshrined the sword Inside the Statue of the Goddess before raising it into The Sky as part of Skyloft. Preceding the Wing Ceremony, Fi appears to Link in his dreams, foretelling him of his destiny. After Link and Zelda are attacked by a black tornado, Link wakes up in his room, where he hears Fi speaking to him. Fi guides him to the Statue of the Goddess, further explaining his fate as the chosen hero and encouraging him to draw the Goddess Sword from its pedestal so that Fi can formally acknowledge him as her Master. Fi gives Link the Emerald Tablet and tells the young hero that he must go beneath the clouds in order to find Zelda and fulfill his destiny, with the tablet illuminating the path ahead.

Throughout Link's journey, Fi aids the young hero by providing him with information about the area he is in, the enemies he is facing, and even messages directly from Hylia to Link. Link can talk to Fi when he is traveling on foot by pressing down on the D-Pad of the Wii Remote. When done so, Fi will give Link various options to choose from, providing the play time of the current session, the current objective, and advice as to what he should do next, which include a summary of the past few events as well as hints and rumors. In addition, Fi will give Link a basic description of a targeted enemy and its weaknesses. Fi will also tell the hero how many times he has defeated this type of enemy and gives an indication of Link's proficiency in fighting this specific type of enemy. When this is used on Bosses, Fi will usually give a limited supply of information about the enemies weaknesses to Link. If the battle goes on for a while and Fi is once again asked to give advice, more information will be available. Other than enemies and bosses, Fi can also scan people and locations. Fi can telepathically talk to people and robots and sense people's auras.

Fi also has a "treasure-seeking ability" called Dowsing. It can sense important people and items and help Link to locate them, acting as a sort of compass. When Link needs to locate a certain person or item, Fi will add a Dowsing option accordingly. The young hero can then choose in the Dowsing menu which specific object or person he wishes to track down. In Dowsing mode, pointing the sword in the general of the target will cause it to beep, which becomes faster as Link approaches the target.

Lastly, Fi also informs Link when his hearts have nearly depleted, as well as pointing out that Link's shield is about to break and when the batteries in the Wii Remote have almost run out.

Whenever Link hits certain Goddess Crests with a Skyward Strike, a message intended for Hylia's chosen hero will awaken deep within Fi's memory. Fi will translate the message for Link while dancing and skating around the room until fully delivering the statement. She will also dance along as Link learns the three songs inside the Isle of Songs. Similarly, playing the Goddess's Harp at points needed to advance in the game will cause Fi to sing along the melody.

After helping Gondo fix Scrapper, Fi is able to persuade the Ancient Robot in helping Link carry various items from the surface up to The Sky. Should Link need the assistance of Scrapper, Fi will call Scrapper using telepathic transmission and ask him to transport it above the clouds.

Once Link seals away Demise within the Master Sword, Fi requests that Link end their "necessary relationship" by returning the Master Sword, as her purpose in aiding the chosen hero in his mission is complete. Link thrusts the sword into its pedestal, but Fi calls him back to give a true goodbye, showing emotions for the first time and claiming that their time together was most precious, for it has experienced happiness before falling into an endless sleep. It then thanks Link and hopes that they may meet again in another life as its consciousness fades away into the Master Sword.

Personality
Similar to Midna, Fi speaks in a synthesized, gibberish language. Its style of speech is also emotionless and robotic, in contrast to Midna's charismatic voice. Fi has a tendency to predict percentages when analyzing things and determining probability. Fi refers to Link as its master, having recognized him as the chosen hero. Although Fi seems incapable of emotion, as the story goes on, it begins to develop a subtle friendship with Link, learning to cherish the moments they spent together and thanking him before she enters an eternal sleep into the Master Sword.

Gender
In an interview, Eiji Aonuma stated his belief that Fi is not a female. This would imply that the entity is genderless. However, he does acknowledge that Fi has a feminine figure. Despite this claim, the spirit is referred to as "Mistress Fi" by Scrapper, one of the Ancient Robots.

Etymology
In music, "Fi" is the musical note that is the seventh semitone of the solfège. More commonly known as "F-sharp" or "F#", for which "Fi" is a solmization syllable for.

Trivia

 * Fi bears a striking resemblance to the Fairy Queen from The Wind Waker and Four Swords Adventures.
 * Fi is the counterpart of Ghirahim, as they are both the humanoid forms of swords and have enhanced mental abilities (Fi has telepathy, and Ghirahim has telekinesis).
 * Fi has a coloration similar to that of the Master Sword itself. Most of Fi's body is purple, like the sword's hilt (though Fi's legs share the green straps adorning the hilt), and the rest is bluish-white, like the blade. The upper part of Fi's cloak, if looked at carefully, makes up the image of the Goddess Sword's crossguard.
 * Although Fi is the first appearance in the games of a spirit of the Master Sword, a voice from the sword speaks to Link in the A Link to the Past Manga. This voice only speaks when Link first touches the sword, where it states that the hero has arrived to "give me new life in a new time" and commands him to raise the sword high. While the manga is non-canon, it is possible that this influenced the concept of Fi as it predates Skyward Sword by some time.
 * Since Fi rests inside the Master Sword for eternity, it is technically in each Zelda game that has the Master Sword, though there are never any signs of its presence.