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.

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.

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.