Disclaimer: I don't own Naruto because if I did I wouldn't be sitting here writing fanfiction.
Summary: Naruto is traumatized as a child because someone he thought of as a brother is killed because of him, so in his memory he decides to become a genius because that was his brother's dream. (He still is going to be hokage).
The creature attacked and stormed the hidden village in the leaves. Its power shook the earth. Its magnitude overwhelmed the ninja. Yet they still rose against it. They still defied the beast for their loved ones. The will of fire burned in them all. They would survive and they would be victorious. But at what price?
"Kushina you know there is no other way we have to do this" said Namikaze Minato the Yondaime Hokage."
"I know but that doesn't make doing this any easier" replied his wife with tears in her eyes.
"Go with me please that way we can go together," Minato pleaded.
She responded to him "I will not forsake my son."
So having accepted that the only sacrifice should be his and his son's Minato set his destination to the battlefield but as he left the building where he and Kushina where located in it was suddenly demolished by a great ball of fire that incinerated everything leaving ashes and a holocaust. Then something inside Minato snapped. The very thin fabric that made him the kind-hearted person he was had just been torn. He shunshined to the beast. The dreaded beast with nine-tails the Kyuubi no Yoko was about to reap what he sowed.
"Son of a bitch!" Minato began by launching his three-pronged kunai all over the beast's body. He proceeded by summoning a warrior toad with his most deadliest weapon the "Kaze Kirite" (Wind Cutter). He then used the flying thunder-god technique to swiftly appear and disappear all over the location of the kunai on the beast's body slashing with his sword and concentrating his wind nature chakra into the sword cutting deeper into the demon. The demon howled with pain unable to bear the assault it roared and pulsed its chakra in an attempt to fight back however his opponent had predicted this and easily evaded the counterattacks. Minato then jumped to the demon's face stabbed his katana into its face and using his weight to push down he proceed to open the demon's face up.
The other ninja had one thought in mind 'Yondaime is maiming the demon!'
Meanwhile Minato continued his relentless assault for revenge. He pulled out a chain of shuriken all linked together and proceeded to whip the Kyuubi who was in too much pain to respond to the enraged Hokage. Minato reached the top of its head and use the Kage Bunshin Kunai and Kage Bunshin Shuriken jutsu to unleash what could be described as an obsidian wall filled with weapons of bloody dynamic that forcefully and painfully struck the Kyuubi's tails and pinned them to the ground. The beast howled in pain because its tails were basically nailed to the earth. The Yondaime shunsined to its back legs and with the Kaze Kirite he sliced the tendons, ligaments and nerves located behind the knees of the Kyuubi. And if that wasn't bad enough he nailed three rasengans to the broken bone that you could literally see. He repeated the process to all four legs until the creature toppled to the floor bleeding heavily it gave one last look at his strong opponent.
He said to it "hell is too good for you baka-kitsune but I will be your judge today," he flashed through seals beginning the Shiki Fuujin, "I sentence you to mortality you sick son of a bitch, you took everything from me so now let me give you a taste of prison life," the Kyuubi saw the Shinigami and howled in fear that his imminent death was soon but he saw a child, but no ordinary child it was his opponent's son, and Minato said his last words "son I love you and I am doing this for everyone's good and for your protection and as for you baka-kitsune tell my son when he meets you that I am his father, that Kushina Uzumaki was his mother, that I defeated and sealed you because I know you were summoned by someone, and because I know you are wise and observant train him in my techniques and yours, and by the way there is a backup plan in case you try to weaken the seal so escape and freedom are two things you can only dream about."
And with that a bright light consumed the battlefield taking the Kyuubi with it and a dying Hokage. Then the Sandaime Hokage appeared next to Minato with Kakashi and Jiraiya of the legendary Sannin.
"Why Minato why did you let yourself die young?" asked the Sandaime.
"Because I can't live without her she was the air that I breathe and now since her death I have been inhaling poison, my existence means nothing without her, that and I need to protect my son in the best way I can, as Hokage I have a responsibility to Konoha I will not be a coward and let anyone else do what I must, but sensei, ojii-san, Kakashi do me a favor and watch over my son, guide him, protect him, and make sure the village celebrates the hero he is for imprisoning the Kyuubi for the crimes against Konoha" and with that the Shinigami took Minato's soul therefore ending any life left in him.
Clouds that had formed in the darkness began to thicken with rain falling on the depressing scene but one ray of sunlight broke through and shone on a crying baby. The three witnesses to Minato's death saw the baby and when Sandaime held it the baby pulled on his goatee in happiness that it was comforted once again. Though in a way the baby seemed to lift the mood for those three with its disturbing power of empathy and so they smiled at it causing a yawn of which cued its slumber.
Jiraiya spoke up saying "so what do we do sensei?"
Sandaime replied "I am too old for maintaining kids so the boy has to go the orphanage and to my dismay I am forced to take the mantle of hokage once again for the peace of the village, Kakashi when you are not on a mission you shall watch over him, as for you Jiraiya you will continue your work outside the village though do return to update little Naruto's seal, I will tell the villagers about Naruto I only hope that everything goes as Minato wanted it.
(Council Chambers)
"There is no vote needed to be cast why the fuck did you let the demon live?!" shouted a village representative.
"You will refer to our hero the right way or the ANBU can take out their frustrations out all on you" threatened the reinstated hokage.
"On with the motions please," requested Sandaime. And the motions were given by Uchiha Fugaku.
"Motion to kill the boy?" and some hands rose out of hatred or insecurity or who knows maybe even ignorance of what the Yondaime's purpose was.
"Motion to make the boy a weapon?" of course only Danzo rose his hand which angered him to no ends.
"Motion to let the boy live and leave him in the orphanage?" and because of the majority voting for the latter motion the council was dismissed while the Sandaime tried to find a caretaker for Naruto he thought to himself 'at least I know that Konoha isn't so ignorant enough as to forcibly end his life'.
And so he found a caretaker that accepted Naruto only for the promised sum of money. And with that the Hokage rubbed his temples and said "it's going to be awhile before I can get back into retirement."
Meanwhile at the battlefield a woman with a baby in her arms was in pain as she tripped into the blood. The baby wailed and cried for it didn't know what was going on one minute it was sleeping peacefully the next it was bathing in blood. It cried so hard at the fear of its location until the point that words were resonating from its lips "what am I doing here? Mama where are you? Mama!" the woman was dying from the labor pains and blood loss.
She whispered to her baby "you can talk? My little isai (genius), that is a good name for you that is what you shall be call Rasuto Isai (Last Genius), now be a good boy and survive for mama she can't make it with you but she will always be in your heart, go on now find a home and remember ashiteru my little isai."
And so Isai crawled through the battle that he remembered to the Konoha gates and then he wailed for help unable to pronounce words again because his mother died and he felt her spirit leave.
And the caretaker for Naruto whom happened to be strolling around saw the poor baby and out of mercy and pity she picked them him up and for the next three years she cared for them both.
Three years later
"Come on Naruto there has to be something you want to be," reasoned Isai.
"Well I would love to be hokage," Naruto admitted.
"Good now why do you wanna be hokage?" Isai asked curiously.
"Cuz hokage means the whole village recognizes you and they respect you and they don't try to beat you to the ground," Naruto responded.
"You really wanna do it then fine I will help you too," Isai stated as he pulled out a kunai.
"Where'd you get that?" asked a perplexed Naruto.
Then Isai slashed and requested that Naruto did the same.
"What? Why?!" Naruto questioned.
"It's a blood promise that we will achieve our dreams and that as of today we will begin to get what we want. And today I am no longer Isai just call me Genius-san," Genius-san smiled as he said this to Naruto.
Naruto eagerly grabbed the kunai and slashed his hand and both of them shook their bloody hands yelling "It's a promise!"
After they searched for the medical facility in the orphanage and told he nurse they need a bandage for a small cut.