Fi is originally from The Legend of Zelda: Skyward Sword. In addition, Famitsu confirmed that both Link and Zelda will be able to wear costumes from Skyward Sword.
The huge ball and chain weapon from Twilight Princess will also be made available.
Hyrule Warriors releases September 26 for Wii U. Are you looking forward to playing?
Related: Zelda Hyrule Warriors Midna Trailer
Source: Nintendo Life