Isomaru

Isomaru more commonly known as the Three-Tails (三尾, Sanbi), is a tailed beast that was sealed within Lyn Nohora.

Background
Isomaru first came into being in the waning days of the Sage of the Eight Paths who used his Creation of All Things ability to separate the Satan's Chakura from its body and divide it into ten separate constructs that would come to be known as tailed beasts in order to ensure that it would never resurface after his death. Some time after being created, the Sage sat down with all the young tailed beasts and told them that they would always be together, even when separated, and that one day they would become one entity again with different names and forms than they did. Then, when the time came, they would know what true power is. At some point Isomaru was sealed within Lyn Nohora.

Appearence
Isomaru resembles a Dolphin It has a pair of human-like arms and hands, but no hind-legs.