Ku is the daughter of Kuro, a giant, wrathful and hate filled owl that lived in the mountains of Nibel in the title "Ori and the Blind Forest". Ku is a young owl with similar physical traits to her mother, with one of her wings disformed in a way that it has no efficient feathers to fly with, making it an important part of the intro sequence to the second title in which she comes in: "Ori and the Will of the Wisps". She was taken into care by Naru, Ori and Gumo while she was only an egg, and hatched at the start of the intro sequence. She has yellow/amber eyes and a white mask patern on her face.