A member of the Akatsuki who is able to control many puppets at once.
Despite some close calls, Sakura was able to survive most of the Kazekage's traps and poisons, 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.
The iron sand would result in a lot of trouble for Sakura, especially since that too was laced in poison,
but she was thankfully being partially controlled by Chiyo which allowed her to avoid things that she could not avoid on her own. After a very close call from one of the 3rd Kazekage's most dangerous iron sand techniques, "World Method," Sakura was able to destroy the 3rd Kazekage puppet and put an end to the threat of the iron sand.
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 ab
le 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 retaliated by using one of the unique modifications he was able to add to his puppet body, the ability to contro
l 100 puppets. Unfortunately Sasori went for quantity over quality and summoned more then he could properly control, but he was able to gain more control over the remaining ones that weren't destroyed, ultimately gaining the advantage. Sakura used an item from one of Chiyo's puppets that allowed her to seal Sasori's body, making him unable to use his chakra... however Sasori was able to escape by sending the plug on his chest to another puppet.
Sasori in the new puppet body stealthily went behind his grandmother and was about to kill her, but Sakura jumped in the way of the blade. Chiyo then used the opportunity to use the puppets of Sasori's parents to stab him through the plug. This plug she realized was the only part of Sasori that was alive... it was a container that held his heart.
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. His puppet body is currently being used by Kankuro
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 symbolism 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