Kidōmaru

is a member of the now deceased Sound Four.

Personality
Kidomaru generally sees a battle as a game, and often plays around with the opponent too much because he prefers to have fun seeing the opponent struggle. His speech also reflects this; when battling Neji Hyuga, he refers to Neji as a "minor character" and analyzes his situation using typical gaming language ("level" and "difficulty").

Invasion of Konoha arc
Kidomaru makes a short appearance in this arc using a barrier technique along with the rest of the Sound Four: Jirobo, Sakon and Ukon, and Tayuya both from the inside and outside so that the Third Hokage cannot escape, nor can the ANBU get into the battlefield. When Orochimaru fled, he used Spiral Spider Web to stop pursuing ANBU.

Sasuke Retrieval arc
Kidomaru uses his web techniques to wrap everyone on Team Shikamaru. Neji Hyuga, using his Gentle Fist is the only one able to cut through chakra and escapes from the web himself and thus finds him a good match with Kidomaru. They then battle, leaving the rest of the Konoha group to go ahead. He fights Neji using his spider techniques which, even with Neji's Eight Trigrams Sixty Four Palms, are difficult to defeat. He reveals a golden armor that is made from liquid secreted from his sweat glands that protects him from powerful attacks to prevent Neji from closing his chakra points. He uses the same element of spider silk to make an arrow and discovers the Byakugan's blind spot. He activates Cursed Seal Level 2 and makes the arrow go right through Neji who later closes all of Kidomaru's chakra points by transfering chakra through the web to kill him eventually.

Abilities
Kidomaru is the spider-like member of the Sound Four; he possesses four extra arms for a total of eight limbs, and has the ability to make webs. He makes his webs through a special type of liquid that is created by infusing spit with chakra. He can also create a thicker gold liquid that hardens into a chakra-blocking metal. This hardened material can be fabricated into body armor, kunai, or his especially deadly bow and arrow. When in his Level 2 cursed seal form, he becomes even more spider-like; his skin becomes darker, he gains horns on his forehead, shoulders and elbows, and grows long white hair. He opens the third eye on his forehead to improve his accuracy (which he normally keeps covered with his Sound forehead protector). However, as Sakon and Tayuya comment, he goes into that state way too easily. He also gains the ability to control the path of his arrows with chakra and thread. His abilities are not kekkei genkai, but clan-related.

Kidomaru is an excellent tactical analyzer, capable of figuring out his enemy's weak point quickly and efficiently, and also enjoys playing with his enemies before he kills them. He seems to prefer fighting from a distance, lending him a considerable advantage and allowing him to avoid close-combat. Close combat is his worst type of fighting.

Quotes

 * "This game has a higher difficulty level than I thought!"
 * "Lord Sasuke... has willingly joined the Sound"
 * "Heh, smart aleck to the end"
 * "I guess it was more fun this way... but now game over!!"

Trivia

 * He is the only member of the Sound Four to be seen wearing a Sound Headband.