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's fighting style consisted mostly of the ability to use his chakra to hold the earth solid. His physical strength was unbelievable, which was demonstrated when he held up a mountain-sized Chōji when in Level 2 cursed seal form.

Arhat Fist
As the physically strongest member of the Sound four Jirobo mainly fought at close range using tiajutsu. He used a fighting style called Arhat Fist. This technique combined basic tiajutsu strikes with his incredible strength causing massive damage to his opponent. Jirobo strength further increased with the cursed seal. In 2nd state his skin turned dark orange and his mohawk grew into a long mane. While in this state he is claimed to be ten times stronger than normal,to the point where he could overpower Choji while he consumed two of the Three Colored Pills.

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.