Infobox:Mokushi

Mokushi was a missing nin/ rouge ninja presumably originating from Sunagakure. Little is known of Mokushi's past; other than at a young age he discovered the cave of the Demon Okuzu, hidden deep in the desert mountains Mokushi wandered for solitude.

A young Mokushi found the Katana named Bedlam which Okuzu was sealed inside. Upon touching the hilt of the sword, Okuzu immediately attempted to completely possess Mokushi's body but was ultimately unsuccessful due to the extended period of time he was imprisoned in the blade, sapped of his physical power. Instead Okuzu promised the young outcast immortality and immense power at the cost of half of his body, and half of his mind, and the condition that Mokushi must kill daily to sate the demon's blood lust. Okuzu offered this condition to the young Mokushi in order to eventually regain his power and completely take over Mokushi's body; but this intention was unknown to Mokushi. Mokushi agreed and took the sword for himself, abandoning his people, setting out to wander the world, and to kill.

Mokushi heard tales of a great missing nin, Sasori of the Red Sand, originating from the same village, and decided to search for him as a possible ally. In some way Mokushi managed to find Sasori, possibly due to his recently heightened abilities granted to him by Okuzu. At first, Sasori wished to turn the young Mokushi into a sleeper agent in order to spy on Sunagakure, but the will of Okuzu proved too powerful to control. Instead Sasori would recruit Mokushi as spy, maintaining his free will, as Mokushi himself wanted to become his student.

Under Sasori Mokushi learned how to control Iron Sand, and was used to spy on all of the hidden villages and to watch over the various sleeper cell agents under Sasori's control. Eventually Mokushi recruited two other rouge ninja, Yamaru; an aspiring puppet master, and Hoda, a spy from the hidden mist.