Danzō Shimura

is a Konoha elder, one of the oldest villagers in Konoha. He is also in charge of the ANBU faction named Root. He is later appointed as the after Pain's invasion.

Background
In the past, Danzō competed with Hiruzen Sarutobi for the position of Third Hokage. When he was not selected for the position, he created the ANBU faction named Root. Although the group was later officially disbanded, it remains active. During the Third Great Shinobi World War, Danzō agreed to help Hanzō of Amegakure in order to receive help in claiming the title of Hokage. He sent some of his forces to deal with the Ame Orphans, but they were all wiped out by Nagato.

When word reached Konoha's leadership of a planned coup d'etat by the Uchiha clan, Danzō was one of the elders to help in dealing with the issue. He took advantage of Itachi Uchiha's pacifist tendencies and convinced him to provide him and the other elders with information on the clan's actions. When Hiruzen's attempts to end the coup diplomatically failed, Itachi was ordered to wipe out the Uchiha clan. However, Itachi refused to kill his younger brother, Sasuke Uchiha, and threatened to share everything he knew about Konoha with rival countries if Danzō ever harmed Sasuke. He met with Madara Uchiha around this time for as yet unknown reasons. At some point, after Shisui Uchiha was killed, Danzō implanted Shisui's right Sharingan and arm into his own body.

Personality
Danzō is a calm and collected individual. Like the Root members that serve under him, he does not allow his emotions to surface. He has been seen losing his composure on only one occasion: when the Fire Daimyo was considering Kakashi Hatake for the position of Sixth Hokage. Danzō believes that Kakashi, like the five previous Hokage, would place morals and peace above Konoha's best interests and lead the village to destruction. For this same reason he does not approve of Tsunade (the granddaughter of the First Hokage and a student of the Third), though he speaks to her politely.

Danzō says that he seeks peace for the ninja world, one he would achieve by uniting all shinobi forces under Konoha's control. To that end, he works in the shadows to ensure that this future comes to fruition. He uses Root to eliminate potential threats to Konoha (with or without the consent of the Hokage) and to further him along the path to becoming Hokage, as he believes he is best prepared for the "necessary" transition. Because of the nature of his actions, Danzō cannot allow the details of what he has done become public knowledge, and thusly brands members of Root with cursed seals to prevent them from revealing his secrets.

However, his loyality can be questioned, because while he speaks about make Konoha stronger, he has no qualms to sacrifice even the entire village like he did at the Invasion of Pain, just to become Hokage, and he selled informtaions to Orochimaru about ANBU members, too.

Danzō is not above using his enemies to achieve his goals. He worked with Hanzō in exchange for help with becoming Hokage, allowed Akatsuki to destroy Konoha to help him facilitate in overthrowing Tsunade, and has some history with Orochimaru. The Fourth Raikage suspects that Danzō was involved with Otogakure and Sunagakure's plot to invade Konoha, which led to the deaths of the Third Hokage and the Fourth Kazekage. He is, however, prone to breaking such allegiances; although Danzō promises Itachi Uchiha that he will not harm Sasuke, he nevertheless sends Sai to assassinate Sasuke and after his meeting with Madara.

His fellow elders, Homura Mitokado and Koharu Utatane, hold Danzō in high regard, and often take his advice when dealing with the politics of the village. It is unknown how much they know about his actions.

Sai and Sasuke arc
Danzō assigned Sai to Team 7 as a replacement for Sasuke Uchiha. Because of this, Tsunade assigned Yamato to the team as well, in order to keep an eye on Sai, in case Danzō had other plans for him. During a mission, Sai made contact with Orochimaru on Danzō's behalf, proposing that the two join sides in order to destroy Konoha. Although believing this to be the evidence needed to prove Danzō works against the village, Yamato later discovered that Sai's actions were a ruse to get close to and kill Sasuke. When Sai proved unsuccessful and displayed attachment to Team 7, Danzō merely stated that "emotion brings hatred, and hatred brings war".

Fire Temple arc
In the anime, Danzō was shown being followed by ANBU agents, on Tsunade's orders, when he was to be briefed by Tatsuji, a spy of his from Amegakure. He and Tatsuji were apprehended and questioned by Tsunade, although the interrogation was interrupted by Sora, who was discovered eavesdropping.

Invasion of Pain arc
When Pain began his invasion of Konoha, Tsunade asked the toad, Kōsuke, to retrieve Naruto Uzumaki from Myōbokuzan to help defend the village. Danzō killed Kōsuke to keep the Nine-Tailed Demon Fox away from Akatsuki's grasp. Danzō was later shown with the members of Root, instructing them not to help with the defense of Konoha in the hopes that Pain's actions would end Tsunade's reign as Hokage.

Following the invasion, leaders of the Land of Fire and Konoha gathered for an emergency meeting. Danzō convinced the daimyo that each of the previous Hokage had passed on a peaceful ideology to their students. This in turn made them too soft on military issues, resulting in Konoha's destruction. The village now needed a strong and firm leader who would enforce the laws of shinobi and bring order to the world. He stated that he alone was fit to be Hokage. After a brief consideration, the daimyo agreed to appoint him as the Sixth Hokage.

Five Kage Summit arc
When Danzō returns from the meeting he receives a letter from Ē, the Fourth Raikage, informing him of the approaching Kage Summit and the actions of Sasuke Uchiha. As his first order, Danzō orders Sasuke be executed as a traitor to Konoha.

While preparing for the Kage meeting, Danzō gives a number of tasks to Root members. Because of Naruto's actions during Pain's assault he has become a hero of the village. Although he would prefer confining Naruto to protect the demon fox, Danzō still needs the support of the Jōnin to officially become Hokage, so he settles for keeping Naruto watched at all times. In regards to Anko Mitarashi's search for Kabuto Yakushi, Danzō put off Anko's assassination. He instead instructs Root to find Kabuto before she does, hoping that Kabuto possesses medical information that will help will his right eye and arm.

Danzō departs for the Kage Summit with Torune and Fū as his bodyguards, after ordering Torune to have his men prevent Naruto from leaving the village. The three are attacked by remnants of the Land of Wood along the way, but Danzō neutralizes them singlehandedly with his Sharingan. Upon arrival in the Land of Iron and the meeting's start, Danzō does not actively participate, only reporting to the other Kage Madara Uchiha's involvement with Akatsuki. Mifune suggests that the five Kage form an alliance of their villages to eliminate Akatsuki, and, because Konoha's Nine-Tails is the only tailed beast that has yet to be captured, nominates Danzō as the leader.

Ao becomes suspicious about the proceedings and uses his Byakugan to expose Danzō's manipulation of Mifune. Before he can be pressed on the matter, Zetsu appears and reveals that Sasuke is nearby. The Raikage leaves to eliminate Sasuke, but instructs Ao to keep an eye on Danzō. When Sasuke arrives at their location, Danzō and his bodyguards use the opportunity to flee, with Ao in close pursuit. At some point during their escape, Danzō's party is tackled by Zetsu's Spore Technique, but manages to dispatch it. Danzō orders Fū to stop Ao, and emphasizes that the retrieval of his Byakugan is top priority. Fū throws Ao off of their trail, but fails to retrieve the Byakugan.

On their way back to Konoha they are confronted by Madara Uchiha. Danzō instructs Fū and Torune to distract Madara while he unseals his right arm. Once he is ready, Madara releases Sasuke Uchiha and Karin. Danzō, revealing that his right arm is encrusted with Sharingan, voices his intent to add Madara's and Sasuke's to his collection.

Sasuke questions Danzō about the arm. Danzō refuses to explain, and springs at Sasuke, launching a punch with his Sharingan-covered arm. Sasuke, however, blocks the attack with Susanoo's rib, and grabs Danzō with Susanoo's arm. He proceeds to ask Danzō whether he really did order Itachi to kill the Uchiha clan. Danzō admits that he did, and then states that many other ninja have died in the manner of Itachi, and that such shinobi are the cost of peace in the shinobi world. Sasuke then crushes Danzō with Susanoo, telling him never to speak Itachi's name again. Danzō, however, had maneuvered behind Sasuke uninjured and unnoticed, and prepares to attack, while proclaiming that the battle will have to be between their eyes.

Seemingly, Danzō is smashed into the ground by Susanoo's palm and incinerated by Amaterasu. Yet, he emerges unharmed from both assaults. Karin concludes that Danzō is using neither Bunshinjutsu nor Genjutsu to survive the attacks, but cannot determine what method is being used. Danzō uses two Wind Release jutsus against Sasuke, though Sasuke largely avoids the techniques, only suffering a wound on his right shoulder. Danzō is suddenly surrounded by a large group of crows, followed by what appears to be Itachi Uchiha, shocking him. Danzo quickly realizes its a Genjutsu and counters by activating a curse seal he placed on Sasuke during an earlier scuffle, paralyzing Sasuke in his place. Taking his time with Sasuke, Danzo begins to insult Itachi for his "mistake" of letting Sasuke live. These words enrage Sasuke, causing his chakra to surge to new levels and produce a perfect Susanoo, breaking free from Danzo's binding jutsu in the process. As the enhanced Susanoo launches an arrow at Danzo, the old ninja shocks everyone by performing a Wood release from his arm, blocking the arrow with huge barrier of wood. Madara quickly realizes that Danzo had some workings with Orochimaru in the past, getting the Wood Release through the genetic material of Hashirama which Orochimaru stole. Madara also realized that despite gaining his power through artificial means, Danzo had also acquired the most forbidden of Uchiha jutsu, Izanagi.

Abilities
Sai stated that Danzō placed a cursed seal on every Root member. The seal prevents them from revealing any information on Root or Danzō. The seal activates when the the wearer speaks about anything relating to Danzō or the Root, and will paralyze and mute the member in question completely. He can utilize this technique in the midst of battle without his opponent knowing.

In battle, Danzō is also quite skilled with a sword, killing many assailants with one. He also used a simple kunai against Sasuke.

Elemental Release Techniques
Danzō is proficient with Wind Release techniques. After performing the necessary hand seals, he can exhale from his mouth powerful vacuum-based attacks that can either slash like blades or pierce like bullets. He can also use wind release to blow himself to safety while in mid-air.

By going through a similar procedure that Yamato (presumably done by Orochimaru), Danzo also has access to the infamous Wood Release of the First Hokage.Orochimaru did it by implanting the cells of the First Hokage into Danzō's right arm and augmented his physical energy. Unlike Yamato however, Danzō's operation appears to be imperfect as each usage of this power causes significant chakra loss, prompting him not to use this power whenever possible.

Shisui's Sharingan and Arm
Danzō is in possession of Shisui Uchiha's Sharingan in his right eye, which he keeps hidden under bandages. It is apparently damaged, as the sclera is not white. Despite this, he is very adept with it, detecting seventeen assassins hidden inside a forest. It's also been stated by Ao that Shisui's Sharingan was capable of manipulating others without their knowing, leading to speculation that he is using Mifune. Danzō eventually admits it, but states that he can only do it once a day; Ao, however, does not trust the claim.

Danzō's arm also belonged to Shisui Uchiha. It has numerous Sharingan implanted into it and what appears to be a human on the shoulder, though he keeps it sealed to a degree in shackles until the need arises. He also claims that he intends to add both Sasuke's and Madara's Sharingans to his collection. Its abilities are believed to be relate to some unknown jutsu that allows him to escape death, as he is capable of escaping every one of Sasuke's attempts at killing him, even though Karin admits it is neither a shadow clone, nor Genjutsu. He appears to have been killed multiple times. Whenever this occurs, one of the numerous Sharingan on his arm shuts itself. After a while he must release the technique in order to conserve chakra. According to Madara, this is a forbidden technique even among the Uchiha clan, named Izanagi.

Danzō also claimed that Orochimaru's research notes held by Kabuto Yakushi, would be very helpful for (Shisui's) Sharingan and arm, but that could mean either adapting to them better or repairing potential damage.

Trivia

 * Judging Tsunade and Shizune's reaction to a picture they saw in an anime omake, Danzō was quite handsome in his youth before the Great War.
 * Danzō, possessing the Sharingan, is one of four characters in the manga to possess a Kekkei Genkai despite not being a member of the appropriate clan, the others being Kakashi Hatake, Tenzō, and Ao. Also, he possesses the Mokuton as well, making him one of two people, the other being Mei Terumī who has two Kekkei Genkai in one body.
 * Danzō's name may be a reference to Kato Danzo, a noted ninja master during the time of the Sengoku period of Japan.

Quotes

 * (To Sai) "Emotions lead one to hate...and hate leads one to conflict and war..."
 * "To be a shinobi is to sacrifice oneself. Closing your eyes to the sunlight, distinguishing yourself in the shadows. That is the true form of ninja."
 * (To Sasuke) "You may have the same eyes as your brother, but you percieve things differently. You do not value Itachi's truth. Instead you just throw your anger at anything and everything. You have wasted the Uchiha clan's sacrifice."