Irounaku or called "Irou" for short, is the Grand Supreme Kai (大界王神, Dai Kaiôshin) and the highest of all Supreme Kais. He and Yhvh rule over the entire universe and Existance. He is first introduced in Seireitou's Training: Beyond Comparison where he gives seireitou the power of Zenkai. He lives on the world of the Kais in the Other World, in the Terrestrial Realm on his own planet. His power is great, for he was able to create an entirly new transformation of a Zanpakutō. He is also seen to be able to bend the elements and Spirit Bend.