Kokuō (穆王, Kokuō), also known by the moniker Five-Tailed Dolphin Horse (五尾のイルカ馬, Gobi no Irukauma), is one of the Tailed Beasts created by the Sage of Six Paths' Creation of All Things technique. Prior to, and during, the events of the Fourth Shinobi World War, it was sealed within Han: a shinobi hailing from Iwagakure. However, after the conflict, its power would come to be divided into Yin and Yang halves; only to be subsequently sealed within a notable Father and his only Daughter.