Kuruk, often referred to by his title Avatar Kuruk, is a posthumous character in the Avatar franchise. He is a minor posthumous character in the 2005-2008 animated television series Avatar: The Last Airbender and its 2012-2014 sequel series Avatar: The Legend of Korra. He is also the posthumous overarching protagonist of the 2019 novel The Rise of Kyoshi and its 2020 sequel The Shadow of Kyoshi.
Avatar Kuruk was the Northern Water Tribe-born Avatar of his generation who succeeded the Air Nomad Avatar Yangchen. Although Kuruk faced little conflict from the mortal world during his lifetime, the waterbending Avatar was continuously plagued by Dark Spirits. A brutal spirit corrupted Kuruk's spirit, slowly draining the Avatar's lifeforce. Despite his weakening, Kuruk fought tirelessly and in secret to fend off the waves of Dark Spirits that attempted numerous times to bring despair to humankind.
Ultimately, Kuruk was able to fend off the Spirits after defeating an exceptionally powerful entity known as Father Glowworm in a titanic battle. However, the wrath of the spirits led to the loss Kuruk's fiancée at the hands of Koh the Face-Stealer. He spent the last years of his life searching for his beloved, although he was unsuccessful and subsequently passed away at the premature age of thirty-three due to the corruption of his spirit. He was succeeded as the Avatar by the Earth Kingdom-born Kyoshi.
Kuruk is voiced by Jim Meskimen.