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, which led to his demise at the hands of an overly-enraged Chōji. Like the rest of the Sound Five, Jirōbō constantly referred to 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.

Like the rest of the Sound Four, he had a cursed seal. When in cursed seal level 2 form, his skin became red, his Mohawk became a mane down his back, and he gained ten times his normal strength. Also, by working together, they are skilled in barrier and sealing ninjutsu.

Arhat Fist
Jirōbō was very strong, such that, when in a cursed seal level 2 form, he could lift a mountain-sized Chōji. Much of his strength is refined into the Arhat Fist fighting style. Which combined simple taijutsu strikes with Jirōbō's incredible physical strength to cause massive damage to his opponents. Using this he could manipulate the earth with his strength from creating barriers to lifting massive sheets of rock. Jirōbō was the physically strongest of the Sound Four but the weakest overall according to the other members.

Earth Release
Jirōbō specialized in Earth Release techniques to compliment his physical prowess, such as throwing large chunks of earth or forming a defensive earth wall. He can also form a prison of earth to drain his opponent's chakra.

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.