Fi, also known as Lady Fi or Mistress Fi, is a recurring character in The Legend of Zelda series. She is a humanoid spirit residing inside the Goddess Sword, which would eventually become the Master Sword. In "Skyward Sword", she serves as Link's partner and guides him during his adventure. Fi goes unnamed in "Breath of the Wild" and "Tears of the Kingdom".

== Appearance == Fi has a slender, humanoid figure with a distinctively robotic appearance. Her smooth, light blue head culminates in pointed features reminiscent of a blade's tip, accentuated by a prominent blue diamond embedded in her forehead and glowing blue, pupil-less eyes that convey a sense of calm analysis. A large, brilliant blue gem, mirroring one on the Goddess Sword's hilt, adorns her chest, set against a purple garment trimmed with gold that extends to her waist; this gem is also the focal point for her to display emotive expressions. Flowing over her shoulders and concealing her arms is a distinctive, split-colored winged gown, light blue on one side and purple on the other, shaped like stylized wings that echo the sword's guard. Her lower body is clad in tight leggings featuring a teal and black diamond or cross-grid pattern, said to symbolize the Master Sword's grip, which seamlessly transitions into matching pointed shoes or boots. Fi's overall design eschews traditional fabric, instead suggesting a manifestation of her spiritual essence through smooth lines and symbolic geometric patterns that visually bind her to the iconic blade she embodies.

== Personality == Fi's voice is made up of gibberish with a synthesized tone, emulating a real language. Her style of speech is emotionless and robotic, and she has a propensity for providing statistical percentages for various conditions. Curiously, Fi has an innate inability to comprehend human emotions despite being capable of detecting them.

Fi refers to Link as her Master, having recognized him as the Chosen Hero to complete Hylia's mission. Despite her initial lack of emotion, she develops 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. She is an extremely knowledgeable and loyal servant, possessing significant utility and magic. Throughout her journey with Link, she develops a subtle friendship, even appearing to experience something akin to affection for her master, becoming progressively more human and emotional.

== Abilities == Like her fellow Sword Spirit, Ghirahim, Fi possesses psychic abilities, specifically telepathy. Throughout Link's journey, she aids the 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. Fi can be talked to when Link is traveling on foot by pressing down on the D-Pad of the Wii Remote.[30] When this is done, 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 any type of enemy and gives an indication of Link's proficiency in fighting a specific type of enemy. When this is used on Bosses, Fi will usually give a limited supply of information about the enemy's weaknesses. If Link is defeated in the battle, and Fi is once again asked to give advice, more information will be available. Other than enemies and bosses, Fi can also scan people, Bugs 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. He 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.

Fi also informs Link when his Hearts have nearly depleted, and will eventually add them as Dowsing targets. If Link's Shield is about to break, she will warn him of this and caution him to take care of its remaining durability. If the Wii Remote's batteries are nearly depleted, Fi will call attention to this.

Fi follows in the tradition of past Link companions by translating messages for Link; in her case, these messages are from the gods of old. 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 to assist Link by carrying 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.

== Trivia ==

• According to the Hyrule Historia, Fi was inspired by the personal assistants of main characters in 1980s anime.
• Hyrule Historia also explains that Fi actually has arms under the winged gown, but they don't appear in-game as there was no need for them.
• In both Breath of the Wild and Tears of the Kingdom, Fi's chime from Skyward Sword can be heard numerous times.
• In Tears of the Kingdom, in memories 15 and 16, a slowed down variation of Fi's theme plays.
• Fi's name could possibly be a reference to the commonly-used abbreviation for "fidelis," Latin for "faithful" or "loyal". However, this is unlikely given the different vowel sound in that word.

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