Noku is the cosuin of Goku. He died during the time Gohan was born. He had been a warrior that killed people for a price. He had lost his life to Broly but had learned Kaio ken and was equal to the power of SSJ2.
He has black hair, brod soldiers, big legs. He could transform from being a small kid (Size of Gohan SSJ2) To his larger Kio Ken form. He is a pure blood saiyan and has a great ape form. He is one of many that has trouble controlling it.