Arnook

History
Chief Arnook is the tribal chief of the North Pole's Northern Water Tribe, the father of Princess Yue. When his daughter was first born, she was gravely ill. Desperate to save her life, he prayed to his tribe's patron Moon Spirit. The answer came to him, and he took his infant daughter to the sacred pool, where a koi, the mortal form of the spirit, dwelt. He placed his daughter in the spirit oasis, and her hair turned white, as she was revitalized by a measure of the spirit's own life force. His wife then named her Yue, for the moon.

At Yue's birth, Arnook had a prophetic vision of his daughter, when grown to maturity, becoming the reincarnation of the Moon Spirit. Despite his best efforts to prevent this, appointing the young warrior Sokka as her bodyguard, his daughter fulfilled her destiny during the Fire Nation siege.