Hiruko (shinobi)

was once a great shinobi of Sunagakure. However, once he died, he became one of Sasori's first Human Puppets, and one of his favorites. As a puppet, he served as Sasori's "puppet armor", as he was capable of hiding inside of him. Sasori even adorned Hiruko with the Akatsuki's robes, and hid inside it so often that others came to recognize him only when he was wearing it.

Chiyo stated that Hiruko had changed since she saw him twenty years ago. After all of his strikes failed due to Chiyo's manipulation, Sakura Haruno destroyed the puppet.

Abilities and Weapons
While alive, Hiruko was considered a great shinobi in the Sunagakure village.

All weapons installed in Hiruko were coated in Sasori's special brand of poison, which would kill the victim after three days of painful paralysis.
 * Extendable iron tail
 * Offense and defense.
 * Heavy back shell.
 * Additional defense (new addition).
 * Rapid launching of senbon from the mouth.
 * Torpedo-shaped left arm that launches shrapnel (new addition).
 * Granted Sasori a gruffer voice.

Trivia

 * Hiruko (蛭子) can be translated to "leech child".
 * In the manga, Hiruko being a human puppet was not mentioned, and is instead just a normal puppet.
 * Hiruko is a Japanese Fisherman god. It can also be translated into "Ebisu".
 * The tail could be seen in a flashback to Sasori's childhood, as it was a part of an unfinished puppet. It had a split end.