Sasori is Japanese for "Scorpion."

As a child from the Sand village, his parents during the war between the Sand and Leaf villages by Kakashi's father, Sakumo. After this his grandmother Chiyo took care of him, not telling him that his parents died... and he waited for them to return.

Chiyo, Sasori's grandmother

He would develop a hatred of waiting and making others wait.

20 years before the start of the Naruto series, Sasori left the Sand village. Before that however he became well known for his ability to create "human puppets," puppets that were made from the bodies of his enemies that he was able to preserve. What made these puppets so dangerous was not only the weapons and traps that were built into them like any other puppet, but they retained their chakra and techniques which Sasori could make use of. His most used human-puppet was Hiruko. A Puppet master's weakness is that they are left vulnerable while controlling their puppets, so Sasori specifically made Hiruko as both a weapon and a suit of armor.

After he left the Sand village, he would both destroy an entire village and join Akatsuki.

He would fight Kankuro, a young puppet master from the Sand village. Though Kankuro was skilled, Sasori was an expert and Kankuro succumbed to Sasori's poison. Sasori would then fight the combined might of his puppet-master grandmother and Sakura.

Kankuro, back in black for Shippuden

Despite some close calls, Sakura was able to survive most of the Kazekage's traps and posions, at which point Chiyo summoned her puppets to help battle Sasori, the puppet replicas of Sasori's parents. They were effective for a bit and managed to remove many of the 3rd Kazekage's weapons and traps until Sasori started using the 3rd Kazekage's infamous "Iron Sand" techniques, which used to immobilize the puppets of his parents.

Sakura Haruno

Sasori then revealed the secret to his youth, he turned almost all of himself into a human-puppet... and a very dangerous one at that, armed with built-in flamethrowers and high-pressurized water jets that were able to slice through stone. He went on to use his abdominal "tail" to injure Sakura and thrust himself towards his grandmother to kill her with his buzz saws on his back, but was stopped by Sakura's amazing strength which ultimately caused him to fall apart... but he was able to pull himself back together.

Chiyo then summoned 10 puppets created by the first puppet-master, Monzaemon.

Sasori, with one of his puppets

His final masterpeice..himself

Knowing he was dying, he gave Sakura and Chiyo a reward for defeating him, knowledge on where to meet his subordinate whom he had spying on Orochimaru. Chiyo would later comment after Sasori's death that he saw her attack coming, but did nothing to avoid it.

Appearance & Characteristics

Sasori never looked to enthusiastic, and was not bloodthirsty like some of the members of the Akatsuki were. He took everything in a very serious manner, and did not agree with his partner, Deidara, on nearly anything. His hair was shown to be a dark red color, and his eyes looked as though he was always sleepy. However, this could easily be explained by the fact that he wasn't actually human after turning himself into his own master creation. He was obviously respected when it came to being a member of the Akatsuki itself, as none of the members ever questioned his actions when he was alive. Like the rest of the Akatsuki members, he wore the symbolistic red cloud patterned cloaks that all the Akatsuki members wore. All in all, I count Sasori as being somewhat of a mixture between Gaara and Itachi as a character. Later he betrays his grandmother Chiyo and is in a battle with Sakura to save Naruto from Sasori.