Kōjin (コージン, Kōjin) more commonly known as the Eleven-Tails (ジューイチビ, Jū-ichibi) is the only known artificial tailed beast in the ninja world. He was biologically created from the cells of Kurama (Nine-Tails) and Matatabi (Two-Tails) by an unknown individual who was believed to the a Junsui decades before First Shinobi World War. He was sealed within Sorbari Junsui less than a week before the Nine Tails' Attack on Konoha. Kōjin shows mostly negative emotions towards the world and can be considered more "malicious" than the nine tails. According to Sorbari, Kōjin planned to take revenge on the Village Hidden in Peace if he had the opportunity.