Kidōmaru

was a member of the Sound Four and was said by Orochimaru to be the most intellectual.

Personality
Kidōmaru generally saw a battle as a game, and often played around with the opponent too much because he preferred to have fun seeing the opponent struggle. His speech also reflected this; when battling Neji Hyūga, he referred to Neji as a "minor character" and analyzed his situation using typical gaming language ("level" and "difficulty"). Like the other members of the Sound Four, he is extremely arrogant with his opponents.

Abilities
Like the rest of the Sound Four, Kidōmaru was skilled with creating barriers and seals. When in his Level 2 cursed seal form, his skin became darker, he gained horns on his forehead, shoulders and elbows, and grew long white hair. Kidōmaru was an excellent tactical analyzer, capable of figuring out his enemy's weak point quickly and efficiently, and also enjoyed playing with his enemies before he killed them.

Unique Body
Kidōmaru had a unique body structure. He possessed two extra pairs of arms, which essentially gave him a total of eight appendages, relating to his spider theme. These allowed him to add power or variety into his attacks, hold multiple tools, simultaneously perform multiple tasks, and form several hand seals at once. He could also use the multiple arms to pull his bowstring to incredible tension, drastically increasing the arrows' power.

He also possessed a third eye on his forehead, usually concealed by his forehead protector. In a serious battle, he would reveal the eye. This eye increased his perception and accuracy by a significant amount, allowing him to pinpoint the enemy's vital points with his arrow.

Spider Webs and Sticky Gold
Kidōmaru had the ability to make spider webs by infusing his spit or sweat with chakra. These threads were extremely sticky, yet durable and elastic. This is because his chakra is constantly flowing through the webs, and they cannot be cut with normal tools such as kunai. He could use them to bind, trap, or even be used for just sensing enemies. However, the Gentle Fist can cut them, as the fighting style is based on using the user's chakra to attack precise points.

He could also create a thicker golden liquid that hardened into a chakra-blocking metal on contact with air. By chewing the spider web liquid inside his mouth, he could make it more solid and gum-like, allowing him to form makeshift weapons. However, this hardened material could be instead released through the sweat pores and fabricated into a body-covering armor that could completely defend him from physical attacks, metal throwing weapons, and even chakra-based attacks, such as the Gentle Fist. Finally, he could form his especially deadly bow and arrows which could shatter trees when fired.

Summoning Technique
In keeping with his spider-theme, he could summon the Kyodaigumo, a giant spider that spawn an immense number of smaller spiders to use the Rain of Spiders technique, which created threads as powerful as Kidōmaru's own.

Invasion of Konoha Arc
Kidōmaru 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 escorted Sasuke Uchiha when he decided to join sides with Orochimaru. After Team Shikamaru caught up with the Sound Four, Kidōmaru allowed the rest of his group to go ahead of him while he caught and toyed with their pursuers. Neji is able to free everyone from Kidōmaru's webbing using his Gentle Fist and engaged Kidōmaru in battle. He fought Neji using his spider techniques which, even with Neji's Eight Trigrams Sixty-Four Palms, were difficult to defeat. He revealed a golden armor that was made from liquid secreted from his sweat glands that protected him from powerful attacks to prevent Neji from closing his chakra points. He used the same element of spider silk to make an arrow and discovered the Byakugan's blind spot. Although he was able to hit Neji, Neji used the arrow to close all of Kidōmaru's chakra points by transferring chakra through the web, eventually killing him. Prior to his demise, Kidōmaru claimed that Sasuke has chosen the path of revenge, and it was useless for the retrieval team to try, and that Neji was the second person to force him to fight at full strength, the first being Kimimaro.

Trivia

 * He was the only member of the Sound Four to be seen wearing a Otogakure forehead protector.
 * means "demon child", and is a common ending for male Japanese names.
 * Kidōmaru can be seen during the omake of Naruto Shippūden episode 129. He's picking masks with Sakon nearby.
 * According to the Naruto Official Databook:
 * His favorite phrase is: "Game Over".
 * Kidōmaru has completed 46 official missions in total: 20 D-rank, 15 C-rank, 8 B-rank, 2 A-rank, 1 S-rank.

Quotes

 * "This game has a higher difficulty level than I thought!"
 * "I guess it was more fun this way... but now game over!!"
 * "What kind of a freak is this guy?"
 * "The weakest one in the game always goes down first!"