The seal. All this started because of the seal The 4th Hokage used that night. Many people including the 3rd Hokage and the 4th Hokage's sensei Jiraiya thought they understood the seal. But they didn't. It is extremely complicated yet so simple, they missed a key detail. The 3rd and Jiraiya both knew the death god sealed the Kyuubi in Naruto after splitting its chakra in 2. The key to the seal was given to the toad summons to protect. And the 4th sealed both his and his wife's remaining chakra and a part of their souls in the seal. This was done in hopes of guiding their son in what was to come. This, the 3rd and Jiraiya knew about the seal, but what they didn't know is that the 4th was studying about nature Chakra. The same chakra Jiraiya uses when he goes into his sage mode. He had been studying nature chakra as a side project. During the 3rd Shinobi war the 4th Hokage knew he was the fastest ninja of his time. But he also knew that if he did not continue to grow, he would be surpassed. His signature move the move that gave him his great speed, also required lots of chakra. His solution, if he could use nature chakra to fuel his jutsu, he could then travel farther faster while also transporting more mass. This is why he started to study nature chakra. To maintain his place as the fastest ninja on any battlefield and to keep his precious people and home safe Minato would put in the training and studying time. On this night, the 4th Hokage made an alteration to the seal he was using to seal his and his wife's chakra and a piece of their souls. The seal would convert nature chakra into regular chakra and replenish the chakra of the 4th Hokage and his wife and sustained it indefinitely. This was the intent of the 4th Hokage, and it worked. It just took time to activate, just over 12 years. For tonight is the night Naruto failed to graduate from the ninja academy for the 3rd time. It's the same night he stole the forbidden scroll of seals and learned his signature jutsu the Kage Bunshin no Jutsu.
When Naruto kicked Mizuki away from Iruka and told Mizuki that he would return any damage he did 1000 fold, Naruto had meant it. When he dug down to summon the chakra to create 1000 Kage Bunshin no Jutsu, he unknowingly started to pull on nature chakra just for the briefest of moments. This nature chakra was instantly sucked into his seal, and activated the recharging portion of the seal that would restore the 4th Hokage and his wife's chakra reserves stored in Naruto. Now with a renewable chakra source, the 4th and his wife woke up from their 12 year slumber and beguine training Naruto everything he ever wanted to know about being a ninja to prepare him for what was to come.
Legends would be told about Namikaze Uzumaki Naruto, and his ultimate defense, the chakra chains that protect him with their own will while he was in combat, but strangle never protected him from the wrath of women like Tsunade or Sakura. People would compare his mastery of the Flying thunder god technique to that of his fathers and wonder how he was able to surpass the 4th. Others would wonder who was the better master of sage mode, Naruto or Jiraiya. But history could not deny the greatest ninja since the sage of the Six paths, Namikaze Uzumaki Naruto.
This in an Idea I had for a story. Unfortunately I do not possess the skills or talent to see this project through.
