Keres is blonde with blue eyes. He has pointed ears and is Leonidas' younger brother.
Keres, Iasius, and Leonidas appear in a fanfic on this wiki. In that fanfic, he is an eight year old boy with a cruel and mischievous heart. He grew up in Calatia Village. He loves to torment his brother, Leonidas. It is unknown what happened to him.
Since he is Leonidas' brother, this would make him Link's uncle.