Elves

From Hellboy Wiki

Elves are a type of magical creature featured in Hellboy II: The Golden Army. Most looked like pale humans with slightly pointed ears, though King Balor also had a crown-like structure. When Elves are killed, they turn into stone and crumble away.

Known elves include Balor, the King of the Elves, and his children, the twins Princess Nuala and Prince Nuada. They also made up a portion of the army that fought in the ancient battle against the humans, as well as the court of King Balor. They also have very long lifes, shown by king Balor and his chldren, who all looked in their prime even thought centuries had passed.