Fi is a character from the Legend of Zelda series. She is a Sword Spirit that resides in the Master Sword, sword made by the Goddess Hylia. Her sole purpose is to help the chosen hero to defeat Demise and his future reincarnations Ganon and his evil minions. After the defeat of Demise she slumbers inside the Master Sword from then on.

She now awakens in the palms of your hands, and now helps you guide to whatever destiny has planned for you in this version of Hyrule that is both familiar and comes with surprises along the way.