Desna and Eska

Desna and his sister are the twin son and daughter of Unalaq and the cousins of Avatar Korra. They will be present in the Southern Water Tribe for a festival which Korra will also attend.

The daughter is the current Princess of the Northern Water Tribe.

Trivia

 * Desna and his sister have been described by the writers as "androgynous, creepy twins".