Minato Namikaze

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Minato Namikaze, also known as Konoha's Yellow Flash, was the Fourth Hokage, and the father of Naruto Uzumaki.

Early life
According to those who knew him, Minato was a very talented ninja-having graduated from the Academy at the age of ten. He came under the tutelage of Jiraiya, and under his guidance, learned to develop his skills. Impressed with Minato's determination to succeed, Jiraiya took it upon himself to teach the latter the Toad Summoning Technique. Minato mastered the technique, being the only person to fully control Gamabunta, a feat not even his sensei could do. His skills would further grow with the development of his own jutsu, the Rasengan and Flying Thunder God Technique.

After attaining the rank of Jonin, Minato was given direction of his own team, which consisted of Kakashi Hatake, Rin and Obito Uchiha. Along with Kakashi, Minato's reputation greatly increased during the Third Great Ninja War, where his skills earned him the moniker of Konoha's Yellow Flash. As a gift for Kakashi's advancement to Jonin, Minato gave him a unique kunai marked with one of the Flying Thunder God markers transportation markers. Shortly afterwards, he informed the team of their mission: destroy a bridge that aided the enemy Rock ninja force. For the mission, Kakashi took Minato's place as commander of the team while he went to a different battlefield, where he was able to defeat a large number of Iwa ninja singlehandedly. His team however was unable to complete their mission, differences between Obito and Kakashi lead the team to be caught in a trap. Obito, however, was unable to survive the mission, instead helping Kakashi save Rin by giving Kakashi his Sharingan eye before being completely crushed by rocks. When Rin used Kakashi's kunai, Minato arrived and easily defeated the Iwagakure ninja. Unfortunately, by the time he arrived Obito was already dead, though he managed to save Kakashi and Rin. They would later go on to fulfill their mission and help repel the invasion.

Fourth Hokage
In the months to come, Minato was chosen by the Third Hokage to lead as the Fourth Hokage (Yondaime Hokage). His first choice, Orochimaru, failed to live up to his expectations-though he thought Minato to be a fine replacement. His devotion to the village and his love for his friends inspired all those around him, and as such, Minato Namikaze became well-liked by the villagers. During his time and relationship with Kushina Uzumaki, Jiraiya showed Minato one of his developing books, which features a fictional character named Naruto. Minato appreciated the name and he would name his unborn son after the fictional character. Jiraiya, however, did not think the name was worthwhile. Kushina approved of the name, so Jiraiya had not much of a choice when both of them had approved. However, just moments after Naruto's birth, the Nine-Tailed Demon Fox attacked Konoha. Minato rushed to the village, where he and Gamabunta faced off against the Tailed beast. Near the end of the battle, Minato made the ultimate sacrifice; using the Dead Demon Consuming Seal, he sealed the demon fox into his newborn son, in exchange for his own life. His dying wish was that Naruto be viewed as a hero, and not as the container of the demon fox, a request not honored by most of the villagers.

Succession
Since the Fourth Hokage never had a chance to pick his successor, Sarutobi resumed his role as Hokage. Soon after the sealing of the Nine-Tailed Demon Fox, the Third Hokage made a decree that Naruto's being a container not be mentioned, so his wish didn't come true, due to the fact that many viewed Naruto in contempt. This decree led to children Naruto's own age to pick up on this contempt, although they did not know why they did so. Because of this, Naruto became mischievous.

Legacy
When sealing the demon fox, Minato divided the fox's chakra in two halves as he sealed the beast into Naruto. He sealed the Yin chakra with the Dead Demon Consuming Seal making it inaccessible to Naruto, while using the Eight Trigrams Sealing Style and the Four Symbols Seal on the Yang chakra to give Naruto access to it. This way, Naruto could call upon the demon fox's chakra without being completely controlled by it, though the Four-Tailed Transformation seems to negate this effect. Jiraiya states Minato wanted Naruto to have the Seal Key that matched Naruto's Trigram Seal to help complete a yet to be identified technique.

Personality
Although unknown, Jiraiya and Tsunade point out that, while Naruto physically bears great resemblance to the Fourth, his personality and style of ninjutsu are almost identical to his mother. This and an earlier statement from Jiraiya on the mission to retrieve Tsunade imply that Naruto and Minato had somewhat different personalities.

This is later supported in the Kakashi Gaiden arc where Minato behaved in a calm but cheerful manner, while dispatching sage-like advice and sound military sense when necessary. When faced with an enemy, he could kill in cold blood, and seemed well aware of the terror his reputation inspired in his foes. He appeared to be respectful of those around him, as he was reproachful of freely speaking of others' pasts, not at all concerned about putting his faith in Jiraiya in regards to his son's upbringing, and was said to have been a very nice person.

Jiraiya noted that, although he was quite a genius, the Fourth's greatest aspect was his desire to succeed, largely attributing his success to hard work.

Jiraiya has said that the Fourth was not the type to do something without reason.

Abilities
The Fourth created several distinctive techniques, including the Flying Thunder God Technique, which essentially allowed him to teleport to any location with the use of a special seal. He also created the Rasengan, a technique that does not rely on hand seals, but instead uses a concentration of spinning chakra in the palm that causes immense damage to its victim on contact. Later in the series it is revealed that this signature technique is actually incomplete. Minato had planned to add his own nature manipulation training to the Rasengan, making it even more powerful, but couldn't manage to combine the two prior to his premature death. Minato's possibly last technique was the Dead Demon Consuming Seal, which was used to seal the demon fox into Naruto, at the cost of his own life.

Past Speculation
Before it was revealed, many fans speculated that the Fourth was Naruto's father, mostly because of their nearly identical physique and looks. The two characters also have the same blood type and technique styles. Throughout the course of the series, characters who knew the Fourth Hokage had also given references to the Fourth when talking about Naruto. However, until it was revealed in Chapter 367, information about Naruto's family relations had been carefully avoided.

Before Pein was revealed, some speculated that Minato was the leader of the Akatsuki, considering they both have nearly identical hairstyles and the leader's apparent knowledge of the leaf shinobi and their beliefs.

Trivia

 * According to Jiraiya, the Fourth is the one of the most skilled Leaf shinobi ever to live. So much so, a flee-on-sight order was given to enemy shinobi during the Third Secret Ninja War.
 * Minato's relationship with Kushina appears to have been secretive because there are very few people in the village who have confessed knowing of it; only the ones closest to the Hokage seem to be fully aware that Naruto is their son.
 * During the battle between the Third Hokage and Orochimaru, coffins containing zombies of the First Hokage and Second Hokage were called up by Orochimaru to battle the Third. A third coffin also emerged, but was blocked by the Third Hokage before it could fully rise. Presumably, this coffin would have contained the Fourth Hokage.
 * Out of all of the Hokages, Minato is the youngest.