In Skyward Sword, what is the name of Demise's servant?

In Skyward Sword, Demise’s servant is Ghirahim.

Ghirahim is introduced as a flamboyant and dangerous Demon Lord who repeatedly confronts Link. He works to free Demise, the ancient Demon King sealed away by the goddess Hylia. His plan centers on capturing Zelda because her connection to Hylia is essential to Demise’s resurrection.

Ghirahim is not merely a subordinate in the ordinary sense. During the final stages of the story, he is revealed to be the spirit of Demise’s sword, given a humanoid form. This explains his unusual abilities, his devotion to Demise, and his transformation back into a sword-like state during the climax.

The character is also easy to confuse with Fi, the spirit residing in the Goddess Sword. Fi guides Link and serves the goddess’s plan, while Ghirahim serves Demise. Impa protects Zelda, and Hylia is the goddess herself. After Ghirahim succeeds in resurrecting Demise in the past, Link defeats him before facing Demise directly.