Uchiha Clan

The was one of the four noble clans of Konohagakure, and was also reputed to be the village's most powerful clan, producing shinobi that were exceptionally talented and battle-oriented. Together with the Senju clan, they founded Konohagakure, but is now almost extinct after the events of the clan massacre.

Founding
The Uchiha clan descended from the elder of the two sons of the Sage of the Six Paths. The elder brother inherited the Sage's "eyes", powerful chakra and spiritual energies. When it came time for the Sage to choose a successor, he questioned the two on what course of action they would follow to bring order to the world. The elder believed that power was the way to bring peace, while the younger believed love was the way. The Sage favoured the ideal of the younger brother, and therefore designated the younger as his successor, causing the elder to be filled with jealousy and hatred. From this hate came what Tobi calls the. From the younger son descended the Senju clan who would be the eternal rivals of the Uchiha. However, the Uchiha suffered another more dangerous curse: a passionate love that can become a bottomless well of despair the moment the one they care for most is dead.

Before the founding of the ninja villages, the Uchiha were one of the many mercenary clans for hire. Because of their Sharingan as well as battle prowess, the Uchiha clan came to be known as one of the two strongest clans, the other being the Senju clan. Madara Uchiha was particularly powerful, and, upon attaining the Mangekyō Sharingan, took control of the clan. Under his leadership the Uchiha grew stronger, conquering whatever clans they came upon, such that, whenever the Uchiha clan was hired for a job, the opposing side would hire the Senju, and vice versa.

Konohagakure
Some time before Konoha's founding, some members of the Uchiha clan began to willingly surrender, realising that they were outclassed by the Senju. The Senju later grew tired of the endless fighting, and approached the Uchiha clan with a peace treaty once again. Though rejected time and time before as Madara feared that an alliance would destroy the Uchiha clan, he willingly accepted after witnessing Hashirama's resolve. The two clans came together to form Konoha, with Hashirama Senju, leader of the Senju clan, being selected as Hokage. Madara believed that this was proof that the Uchiha would be made subservient to the Senju, but his clan saw this only as his attempt to rekindle the flames of war. They turned their backs on him, and he defected.

Following Madara's betrayal, having gone into hiding after faking his death in the battle against Hashirama, the Second Hokage Tobirama Senju gave the Uchiha control of the Konoha Military Police Force as a sign of trust. However, this was really just a way of keeping the Uchiha's emotions in check so the village would not end up with another Madara. Over the years, some Uchiha, such as Setsuna Uchiha, came to realise their ostracism and believed that they were being purposely kept out of Konoha's governing affairs. Though Setsuna and his followers tried to rebel against the village as Madara did, they found that it was too late to make a difference, as the Senju had already completely suppressed the Uchiha. Despite Tobirama's attempts, it only caused a greater rift between the Uchiha and the village. The matter grew worse when a young Obito Uchiha, presumed dead at the time, witnessed the death of Rin and became a follower of Madara's ideals.

Massacre
Years later, after the Nine-Tails' Attack on Konoha, Konoha's elders began to suspect that an Uchiha was behind the attack because of their ability to control the Nine-Tails with their Sharingan. Tobi stated that the clan was forced to live in a corner of the village, ostracised from the rest of the community, and placed under heavy surveillance. This gave birth to ill-will amongst the clan and the Uchiha interpreted this as confirmation of what Madara had warned them of years earlier, and began to plan overthrowing the village. Itachi disagreed with his father who was the then leader of the clan and militia Fugaku's coup d'état plan, and informed Konoha's leadership of what the Uchiha were up to. Shisui Uchiha, who had been told to keep an eye on his best friend Itachi also disagreed with the clan's plan and joined Itachi in his mission to put a stop to it. He attempted to used the ability of his Mangekyō Sharingan: Kotoamatsukami to Danzō from committing the genocide, but once again, Danzō — determined to protect the village the only way he saw possible — stole Shisui's right eye from him. Saddened that he had failed to stop Danzō, Shisui met with Itachi and gave him his left eye before the elder came after it as well, telling him to protect the village and the name of the Uchiha. The Third Hokage, Hiruzen Sarutobi who had disagreed with the treatment the Uchiha were receiving, tried to negotiate for a more peaceful solution, but as time passed and that strategy seemed to be getting them nowhere, Danzō took matters into his own hands and inveigled Itachi to commit the genocide with threat of his clan's actions creating another war and innocent children, such as his little brother, becoming a casualty.

Within one night, the entire clan was slaughtered with only one known Uchiha left alive: Itachi's younger brother, Sasuke. Sasuke would spend the next few years trying to avenge their family by killing Itachi, something Itachi had planned from the very beginning. After accomplishing this goal, Sasuke learned of Tobi's existence. Tobi, who is in fact Obito Uchiha, another survivor of the clan who was also the one behind the Nine-Tails' attack, told Sasuke about the Uchiha's history and why Itachi had wiped out the Uchiha, prompting Sasuke, with Obito's help, to resolve to destroy Konoha. Sasuke would later be shown the truth by Itachi himself after he was reincarnated.

Abilities
The Uchiha were famous for their powerful chakra, exceptionally strong techniques, and natural aptitude for anything combat-related. The clan possessed an innate aptitude for Fire Release nature transformation, with even the youngest of members able to use it from just observation. As such they have created several and use this nature transformation more skilfully than any other. Their signature technique was the Fire Release: Great Fireball Technique. Clan members were not recognised as adults by the rest of the clan until they could successfully use this technique. The Uchiha were also highly known for their mastery of ninja tools. They themselves invented many shuriken move sets which required the use of thin metal wires, one example being the Windmill Triple Blades technique. They were apparently also somewhat skilled in barrier ninjutsu, having created the Uchiha Flame Formation which, still holding to their natural affinity for fire, created a barrier that burned whatever came in contact with it.

The Uchiha clan were most feared for their powerful Sharingan, a kekkei genkai which gives them the ability to see the "colours" of chakra, allowing them to analyse and copy their opponent's skills, along with a number of other abilities. Only a select few members of the Uchiha clan manifested the Sharingan. Due to their natural affinity for battle, and their proficiency with ocular genjutsu, many ninjas considered it more tactically favourable to flee rather than face an Uchiha shinobi in one-on-one combat. Among the techniques granted by the Sharingan, the Izanagi and Izanami are deemed to be forbidden, due to their effect of rendering the user blind in exchange for creating genjutsu capable of escaping death or trapping the opponent without failure. Though the clan was feared for their Sharingan, the eyes have also been transplanted into various characters outside the clan.

Madara and Izuna were the first two Uchiha to awaken an advanced form of the Sharingan known as the Mangekyō Sharingan, which can be activated by the pain of losing close friends or family members. However, frequent use of the Mangekyō Sharingan deteriorates the user's eyesight and results in blindness. Only by taking the eyes of a sibling can one's vision be restored, a process that results in the creation of an. Itachi indicated that the intricacies of the Mangekyō Sharingan were only discovered after decades of trial and error, implying that many Uchiha throughout history had made the attempt to gain the Mangekyō Sharingan.

One member of the clan, Madara, had managed to awaken the Rinnegan. After he stole and integrated Senju DNA into his body, he noted that the dōjutsu did not manifest until he was nearing the end of his natural lifespan.

Trivia

 * Uchiha is another way of pronouncing, which is the Uchiha clan symbol. Uchiwa can be used to fan flames, making the flame hotter — referring to the fact that the Uchiha is a clan of fire techniques users.
 * Attire-wise, the Uchiha have always favoured high-collared outfits with their clan's symbol proudly emblazoned on the back. Over the generations, their attire has changed with their attire initially consisting of a dark coloured mantle along with pants, which later became simple shirts and pants, all the while retaining the high collar.
 * Most of the powerful techniques exclusively used by the Uchiha (Tsukuyomi, Amaterasu, Susanoo, Izanagi, Izanami and Kotoamatsukami) are named after Shintō deities from the Japanese creation myth.
 * Itachi, Sasuke, and Obito are the three Uchiha that remained after the massacre, and all three eventually became affiliated with Akatsuki and like Madara and his brother Izuna, awoke the Mangekyō Sharingan.
 * In the earlier stages of the series, Kakashi stated that there are rumours the Uchiha clan's Sharingan was derived from the Hyūga clan's Byakugan. However, Kurama is the only one to know the full truth about the Uchiha clan yet appears to have no intention of revealing what it knows.
 * According to Obito, the Uchiha clan is destined to a life of revenge against their hated enemies, the Senju clan and Konohagakure. However there are exceptions in the form of Itachi, Shisui and Kagami Uchiha, who had opposing ideals. In addition, despite having fallen victim to it himself, during the Fourth Great Shinobi War, Sasuke appears to have overcome his inborn hatred and embraced the same ideals as his brother.
 * The clan had various places affiliated with them:
 * A senbei shop that was famous throughout the village.
 * A shrine as well as a secret meeting place under said shrine.
 * A river which runs through their compound.
 * A supply base in Sora-ku that Hebi visited for supplies.
 * A hideout that served as the arena for the final battle between Sasuke and Itachi.