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 his 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 the weakest one in the game and analyzed his situation using typical gaming language ("level" and "difficulty"). Like the other members of the Sound Four, he was extremely arrogant with his opponents. He was also the only one of the Sound Four not to have a perception of morality.

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. He was able to control spiders at will and used them to make a defensive position around him and his comrades.

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 Jutsu 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 jutsu, which created threads as powerful as Kidōmaru's own. they were enough to stop Neji's rotation jutsu dead in place.

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,along with his comrades,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 after leaving choji to fight Jirobo, Kidōmaru allowed the rest of his group to go ahead of him while he caught and toyed with their pursuers. After he played with naruto and found that all the clones of naruto were caught instead of him,he tried to kill the real one but [Neji is able to save him in enough time and free everyone from Kidōmaru's webbing using his Gentle Fist and engaged Kidōmaru in battle after the others had gone ahead. Kidomaru was at first confident that he could kill neji very quickly,but after realizing the power of the Byakugan he activated the first stage of his curse mark saying to Neji he had made this game more of a challenge than he thought it would be. He then summoned the Kyodaigumo,his largest spider and fought Neji using his spider techniques which, even with Neji's Eight Trigrams Sixty-Four Palms, were difficult to defeat. He had earlier 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 and he decided to fight at a distance for better safety. As the course of the fight continued,he began to use kunai to throw at neji and,by chance,discoverd the Byakugan's blind spot when one got through and cut Neji's shoulder. He then proceeded to throw more into his blind spot and after he hit Neji twice more,he signaled the Kyodaigumo to finish Neji off,but he managed to stop it only for it to turn into Kidomaru's silk he was then hit four more times and fell to the ground. Kidomaru then believed he was dead and said he had enjoyed himself,even though he knw he would win,but then Neji got up and Kidomaru,delighted by this,reach his second state of the curse mark to finish Neji off. He then used the same element of spider silk to make a bow and arrows and fired it directly into Neji's blind spot. Neji however had made a barrier of chakra around him and both sensed the arrow and threw it off its course. Instead of hitting his blind spot,it went through his shoulder. Kidomaru then spawned another arrow with a thread attached to it and used it to guide into his blind spot. The arrow was however thrown off by the trees and Kidomaru climbed to a higher vantage point and used his Striking Acurracy 120 percent destructive power absalute maximum to attack Neji again. Although he was able to hit Neji, Neji moved just a few inches to evade the worst and used the thread to utalize his Gentle Fist. He then damaged several of Kidomaru's internal organs causing him to fall out of the tree. He could still move however and cut the thread before beginning to depart,believing Neji to be dead. Neji however was still alive and used the Byakugan to see Kidomaru and approach him unexpectedly. kidomaru,unaware of the approaching Neji,then said he let it drag on too long and that he played to hard before Neji jumped up and surprised him. Neji then used the Gentle Fist to attack Kidomaru's chakra points,halting his chakra flow and causing him immense pain before dealing a direct and fatal blow to Kidomaru's heart,knocking him down to the ground. Kidomaru then returned to his normal form,having lost all his chakra,and asked Neji why he was still alive. Neji said it was because he couldn't let down his friends. Kidomaru then said that sasuke had fled to the sound village of his own free will and that they could do nothing to which Neji said one person could save him from this path,thinking of Naruto and said fate is not something you decide. Neji then recounted something Kidomaru had said earlier "The weakest one in the game always goes down first" and then said "Well look where we are now". Kidomaru responded by saying he looked like he was sitting at death's door too before callapsing and coughing up blood. He then said curse you to Neji and died leaving Neji the victor.

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!"