Having left the Leaf village, Shinga was a traitor to Konoha. He once worked as a scientist under command of the Third Hokage. With the help of his two subordinates he found a new jutsu of untold power, the Jibakugan. Only Shinga knew how to control this jutsu and he gained a lust for power. He created the demon shinki,which drains chakra from the land. The Third Hokage heard of Shinga's new discovery and felt that the jutsu was morally wrong to use on others. He banned the technique, making it a forbidden jutsu. The Third then dispatched Itachi Uchiha to arrest Shinga, but Shinga was able to escape for they could not find his body in a mudslide. Shinga retrieves the demon shinki from the sealed hall and merges with it. This results to Tsukigakure being wrapped around by a tree. Years later, when Shinga sees Sasuke's eyes, he believes he is Itachi Uchiha.
Abilities
Shinga has a jutsu called the Jibakugan that enables him to control other people.