Koonak is a minor character in the DC universe, mainly featured in Batman: The Animated Series, as the young protege and adopted son of Victor Fries. He makes a minor appearance in the Non-Disney vs. DC Villains War.
Non Disney Vs DC Villains War
Koonak briefly appears in the Artic cave, alongside with Victor Fries, as a group of underwater explorers, directed by Bishop, make their way to the Artic, to track down the scientist. Koonak has yet to make another appearance.