Jirōbō

was the physically strongest member of the Sound Four and the weakest overall, according to the other members of the Sound Four.

Personality
He disliked it when Tayuya used foul language or when she called him "fatso", and complained to her about it. Despite this, he proceeded to call Chōji Akimichi fat near-constantly during their battle. At first Jirōbō appeared as the silent yet slightly irritated member of the group; until the Sasuke Retrieval Arc in which he revealed an overly sarcastic and arrogant persona. Like several other Sound Four, however, he had his own perception of morality, criticizing Shikamaru for what he saw as giving up on Chōji and selling his team-mates out. Like the rest of the Sound Five, Jirōbō constantly referred his enemies as "trash".

Abilities
Jirōbō could drain chakra. He was almost always enormously hungry, and he could get the same energy from absorbing opponents' chakra that one would get from food. He could trap opponents and, ideally, absorb their chakra until he was full and they were dead.

Arhat Fist
Jirobo's main fighting style was called Arhat Fist. By combinig simple tiajutsu strikes with his incredible physical strength Jirobo could cause massive damage to his opponent. Using this strength he could hold the earth solid with chakra. His strength was further increased with the cursed seal. In second state his skin turned dark orange and his mohawk grew into a long mane,in this state he was said to be ten times stronger than normal. Jirōbō is the strongest physically in Sound Four but the weakest overall stated by his teammates.

Konoha Invasion Arc
Jirōbō made his first appearance with the rest of the Sound Four, erecting a barrier to keep others from interfering in Orochimaru's fight with the Third Hokage. He later escorted Orochimaru when he fled.

Sasuke Retrieval Arc
The Sound Four escorts Sasuke Uchiha when he decides to join sides with Orochimaru. After Sasuke Retrieval Team found the Sound Four, Jirōbō allowed the rest of his group to go ahead of him while he used Earth Release Barrier: Earth Prison Dome of Magnificent Nothingness and the Chakra Absorption Technique combined to trap Team Shikamaru and drain their chakra at the same time. Shikamaru later had a plan to escape the barrier by making a hole where there was least amount of chakra. His plan succeeded only for it to turn out that Jirōbō was just getting ready.

After Jirōbō insulted Shikamaru, Chōji, angered by this, challenged Jirōbō to a 1-on-1 fight, allowing the rest of Shikamaru's group to go ahead. By using his Three Colored Pills, Chōji was able to overcome Jirōbō's cursed seal and kill him.

Trivia

 * Jirōbō can be seen during the Konoha Sports festival and the omake of Naruto Shippūden episode 129.
 * Jirōbō's hair is shown as red in the manga. In the anime it has an orange color.