Fi

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

History and Abilities
The Goddess Sword is located in the floating island known as Skyloft; however, Link eventually finds the sword and uses it to travel between two lands: Skyloft, an island floating above the clouds, and Hyrule, which is being ruled by evil forces. According to Eiji Aonuma, when the Goddess Sword is helping Link, it will transform into Fi and will lead the young hero back and forth from Skyloft to the land below. Moreover, Fi has a "treasure-seeking ability" called Dowsing, where it can sense important items and inform Link about them. Fi is also the focus on the reason why there are two lands divided by a bank of clouds."

Like Navi and Tatl, Fi has the ability to scan enemies to tell Link about them by pressing down on the Wii Remote. It can also scan people and locations. Fi can telepathically talk to people and robots and sense people's auras. When Link is speaking to Fi, he has the option to gather supplemental data about the area he's in and the enemy he is facing. Fi can also give Link advice, remind him of his objective and provide total play time.

Personality
Similar to Midna, Fi speaks in a synthesized, gibberish language. Its style of speech is also emotionless and robotic. 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. Fi also has a tendency to dance and skate around when relaying a message from the gods.

Gender
In an interview with Eiji Aonuma, he said that even though the Goddess Sword transforms into a feminine figure, he revealed that he does not consider it as a female person. This entity seems to be genderless.

Trivia

 * Fi bears a striking resemblance to the Fairy Queen from The Wind Waker and Four Swords Adventures. The reason for this, if there is any, is unknown.
 * Fi is the counterpart of Ghirahim, as they are both the humanoid forms of swords.
 * Fi has a body similar to the Master Sword itself. Most of her body is the purple of the handle, the rest is the bluish-white of the blade. The upper part of her cloak, if looked at carefully, makes up the image of the Goddess Sword's crossguard. Her legs have the same green straps as the handle.
 * Depsite Eiji Aonuma's claim that Fi is genderless, it is referred to as Mistress Fi by Scrapper, one of the Ancient Robots.
 * 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 uncanon, it is possible that this influenced the concept of Fi as it predates Skyward Sword by some time.