Kakashi Hatake

Kakashi Hatake was a Konohagakure Jonin, and at different times in his life, an ANBU member and the leader of Team 7. He was the son of Konoha's White Fang, Sakumo Hatake, and like him, was a regarded as a genius. After his meteoric rise in the ninja academy, Hataki became the student of the Fourth Hokage, subsequently becoming a Jonin during the Third Great Ninja War. Following the war, Kakashi earned renowned fame for his use of the Sharingan, earning him the moniker Copy Ninja Kakashi.

Early life
Kakashi was the son of the legendary White Fang of Kohona, Sakumo Hatake, and like him was considered a gifted shinobi. He graduated from the academy at the age of 5, becoming a Chunnin a year later. However, his success came at a great loss; his father, once well respected in the village, fell into disgrace after choosing to save his comrades rather than complete a mission, causing Konohagakure to suffer in the war effort. Dishonored, Sakumo committed seppuku after deep depression and a drop in his skills, which caused Kakashi to lead his life strictly by the Ninja code. His White Light Chakra Saber, for which his father was nicknamed, was given to Kakashi.

Team Minato
He went on to become apart of the future Fourth Hokage’s team, alongside Obito Uchiha and Rin, a medic-nin. Kakashi's relationship with Obito and Rin was very much similar to that of Sasuke's relationship with Naruto and Sakura respectively in which they share a complicated relationship that later developed into a close friendship.

In the midst of the Third Great Shinobi War, at a meeting to hear their new mission, Kakashi is elevated to Jonin and receives gifts from his sensei and teammate; a special kunai from the Fourth and a medical pack from Rin. After receiving their gifts, the Fourth informs the team of their mission: they must travel through the Grass Country in the midst of a conflict between Iwagakure and Konohagakure to destroy a bridge. Along the way, Kakashi’s team notices that they’re being watched from the trees by Mahiru, an Iwagakure ninja. Kakashi sees this as a good opportunity to use his newly created jutsu, the Chidori. He arrogantly ran off to attack the hidden foe, only to face off against Mahiri’s multiple Shadow Clones while Rin was captured by enemy Shinobi. Obito immediately stated his intention to rescue her, but Kakashi disagreed on the basis that they needed to complete their mission, opting not make the same mistake his father did. Kakashi parted ways with Obito soon after, and as he reflected on Obito’s words and Rin’s prior kindness, he realized that his father had made the right choice after all. This prompted him to rejoin Obito in the rescue effort, claiming that Obito couldn’t survive on his own.

During the attempt to rescue Rin, Kakashi detected a Rock ninja, and yelled a warning to Obito, who was too slow to react. Kakashi jumped in front of Obito to save him from the enemy's kunai. losing his left eye in the attack. Obito, in return, awakened his Sharingan and killed their assailant. The two managed to rescue Rin, however, a rockfall technique was triggered, hindering their escape. It was then that Obito chose to make the ultimate sacrifice, pushing Kakashi out of its path. As he laid there dying, Obito had Rin implant his Sharingan eye in Kakashi’s damaged eye socket, referring to it as a gift. He died shortly thereafter. As his first act with his new eye, Kakashi avenged Obito by killing the enemy ninja with his now-perfected Chidori technique.

Obito's death had a huge impact on Kakashi's personality; initially flaky and unreliable, Kakashi became more mellow, having adopted some of Obito's traits such as his notion for teamwork.

Joining the ANBU
Prior to the Fourth Hokage’s death, Hatake joined the Konohogakure ANBU where he served as squad leader. During this time, Kakashi rose to fame as Konohagakure's Copy Ninja, a nickname he earned due to use of his Sharingan eye- having copied over a thousand jutsu. He cultivated a group of students- which included Yugao Uzuki and Tenzo, and recognized the latter as the most successful of this group. It is unknown when or why he left ANBU, but he is never seen without the iron guards on his gloves, a characteristic of ANBU uniforms.

Kakashi and Team 7
Amongst the students and instructors at the academy, Kakashi developed a reputation for failing every potential Genin team that took the Survival Training Exam he proctored. When he was given Team 7—which consisted of Naruto Uzumaki, Sakura Haruno, and Sasuke Uchiha—Kakashi decided to test not only their skills, but their ability to work as a team. He gave them a Survival Training Test, which involved team stealing two bells off of Kakashi's person; only those who retrieved the bells were allowed to eat while the one without was forced to starve. Sakura's tunnel vision focus on Sasuke, Naruto's impulsive insistence on being a one man show and Sasuke's arrogant superiority complex and loner attitude led the team to fail the Survival Training Exam. Only after Sakura and Sasuke tried to feed Naruto that he revealed the purpose of the test: teamwork. Kakashi passed the team and invited them to a group session, where he got the chance to learn about their goals and dreams. At the start of their partnership, Kakashi seemed a bit wary of his team—especially Naruto, who he found to be quite annoying. Over time, however, his feelings for his team changed, and he took on a more brotherly role.

Journey to the Land of Waves
Unsatisfied with the usual D-ranked missions assigned them, Naruto motioned for the Third Hokage to give them a real ninja mission. Without hesitation, the Third Hokage assigns Team 7 their first C-ranked mission: escorting the bridge builder, Tazuna, to his home in the poverty-stricken Wave Country. As the group ambled through the forests, Kakashi discovered a strange puddle along the roadside, and deduced that they were being followed. At the instant the Demon Brothers attacked, Kakashi performed the replacement technique, faking his death. After realizing that the ninja were after Tazuna, Kakashi unveiled himself and subdued the ninja before any harm befell on the others. The ambush was enough to confirm his suspicions of the bridge builder, and after confronting Tazuna about his reasons for lying to them, Kakashi deemed the mission too advanced for his genin students. This coupled with Naruto's injury convinced Kakashi to end the mission and take his team back to Kohona. Naruto, however, stubbornly stood his ground, and protested against Kakashi's decision.

Characteristics
Before Obito's death, Kakashi's personality was influenced by the death of his father. By the time he became a Jonin, he followed the rules of being a ninja to a fault, willfully abandoning a comrade if it ment failing a mission. He had a change of heart however when Obito told him his father was a hero, despite what others thought. After the mission he'd come to value the lives of his comrades over any rule and failed many of his given squads for not seeing it. He is also late to many engagements as he spends alot of time at a monument Obito's name is engraved in, giving him the same habit Obito had during their younger days. Though he had changed, some of his old habits didn't die, such as him bluntly telling the truth and his effort to not allow others to get to close to him as he already stated everyone close to him was already dead.

Kakashi's life is almost none existant beyond his life as a shinobi. His face is always covered in his mask, even when he was a child. And though he states he has many hobbies the only one that seems true is his love for Jiraiya's adult novel Icha Icha (lit Make Out) series. From Team 7's graduation from the Academy up to their first mission after Naruto's return, Kakashi has been seen reading 'Icha Icha Paradise (イチャイチャパラダイス Icha Icha Paradaisu), Icha Icha Violence (イチャイチャバイオレンス Icha Icha Baiorensu, and Icha Icha Tactics (イチャイチャタクティクス Icha Icha Takutikusu). Tactics end up being his downfall during the second bell test with Naruto and Sakura as the two came rushing at him with Naruto about to reveal spoilers causing Kakashi to cover his ears so he could hear them speak, thus ruining his ability to hear their jutsus, and closing his eyes so his Sharingan eye couldn't read their lips.

Abilites and Jutsu
When Kakashi was younger, he was taught the Rasengan by the Fourth. However since the Rasengan was ment for the users chakra element to be mixed with it, Kakashi was never able to master the jutsu. Instead Kakashi developed his own, and only original, jutsu; the Chidori. While power, the Chidori had two crippling drawbacks. The first was the speed of the attack and the fact that the user had to run in a straight line. This would cause a tunnel effect for him which an opponent could take advantage of to either avoid or injure Kakashi. The second was the amount of Chakra needed for the attack. The Chidori used so much of Kakashi's chakra that he could only use the technique four times any given day. With the Sharingan eye, the tunnel effect could be worked around as he could now see his opponents movements clearly, but he could still only use the jutsu four times a day. He latered refined the Chidori into the stronger Raikiri (雷切, literally "Lightning Blade").

The Sharingan is however his most useful asset as he allows him to copy any jutsu used against him. The draw back of the Sharingan is that because Kakashi has no Uchiha blood, he can't deactivate it, so if it was allowed to see it would use up chakra needlessly. Kakashi avoids this by covering it up with his forehead protector further giving him a mysterious appearence. Sometime between Naruto's departure to his return from Konoha, Kakashi developed his own Mangekyo Sharingan, presumably without the requirement of killing his best friend. His eye has the ability to manipulate space and was shown to be able to tear off ones body parts and hurl them into another dimension. However since the standard Sharingan costs him more chakra than normal because of his lack of Uchiha blood, the Mangekyo Sharingan uses so much chakra that he had to be hospitalized for a week after using it three times in one day.