Years have passed since that day. Zetsu has traveled far and wide across the Elemental Nations searching for anyone who he has deemed worthy of the Kamiton Kekkei Mora. Sticking to the shadows, he has spied on many powerful individuals, yet he has not met anyone powerful who was neither arrogant nor an asshole. Even the more benevolent of the strong have some 'taint'.
Zetsu found one person that may have been worthy of the Kamiton. So, in order to find out if Hashirama Senju was worthy, Zetsu granted the Senju a minuscule amount of the Kamiton's power, allowing him to use Mokuton. Based on the man's personality and goals, Zetsu believed that Hashirama would have been a wonderful person to give Kamiton.
However, that idea was quickly snuffed out as by the time Zetsu returned from scouting out any more potential successors, Hashirama already married Mito Uzumaki and had children.
In order to keep balance within the Senju's family, Zetsu decided not to give Hashirama and any of his future children the Kamiton, lest those already born without it become jealous of their younger siblings.
Decades have passed since then. Hashirama died during what was known as The First Shinobi World War or The First Great Shinobi War. He also sealed all the Biju into vessels known as Jinchuriki and (foolishly) gave each major village one or two, including a minor village known as Takigakure, or The Village Hidden by a Waterfall. His brother, Tobirama Senju, a master of Suiton jutsu, also died during that war, but not before he was titled Nidaime Hokage of Konoha, with Hashirama being the Shodaime.
Tobirama's student, Hiruzen Sarutobi, was appointed Sandaime Hokage after the death of his sensei. As the years went by, he became a powerful shinobi and Kage, earning himself the title of God of Shinobi, a title that, before, was only held by Hashirama himself.
During the time passed, no one since Hashirama has been worthy of the Kekkei Mora. No matter where he looked, Zetsu couldn't find anyone even remotely worthy of the Kamiton. Not even Hashirama's future family had the potential.
It was only during The Third Shinobi World War that Zetsu found someone who he thought had the potential to be a proper successor. So, like Hashirama, Zetsu gave Minato Namikaze a taste of the Kamiton, giving the future Yondaime two Kamiton jutsus in seal form: the Rasengan (Spiralling Sphere) and the Hiraishin (Flying Thunder God). Though, Minato still had to figure out how to actually use them.
Nevertheless, by giving Minato these two powerful techniques, Zetsu unintentionally gave him the means to defeat an army of Iwagakure, The Village Hidden by Rocks/Stone, shinobi, earning him a 'Flee On Sight Order' in the Bingo Book, and gaining the ire of many, if not all Iwa shinobi.
After the end of the Third War, Minato was appointed Yondaime by Hiruzen. The entire village of Konohagakure cheered and celebrated this event, with many looking forward to the future of the village now that it had a powerful, charismatic, and se- handsome (I will not let this story be corrupted by fangirls. *Shudders*) Hokage. Zetsu, too, admired this man, and cam close to introducing himself, explaining his background and father's wishes, and giving Minato the bloodline outright.
However, there were very few who were skeptical about having Minato as their Kage and even fewer who were outraged. Those who… disliked the idea of Minato as the Yondaime included a certain serpentine Sannin.
"This is outrageous! I was supposed to be the next Hokage, not some young brat! You even said that I was going to be the next one, sensei!", screamed an uncharacteristically enraged Orochimaru, who was normally calm, collected, and preferred underhanded tactics instead of direct confrontation unless necessary.
In this case, the Snake Sannin deemed it necessary.
"I know that I once said you would be my successor to the hat, Orochimaru, but one cannot deny the sheer amount of charisma that Minato has, as well as the love that the general populace has for him. His Will of Fire burns brightly", explained an aging Hiruzen Sarutobi.
"Oh, not again with this nonsensical 'Will of Fire'. The Will of Fire is naught but an idea, an idea that I doubt would actually manifest itself in reality. Unless I see undeniable proof that such a thing actually exists, I would believe in it as much as I believe that a Daimyo would eat his own money."
"I know that you believe that the Will of Fire is nothing but a useless idea, however, one cannot simply deny that, even if it did not exist, the placebo of believing in it certainly shows visible effects."
"Bah! I must go to my laboratory lest you start spouting even more nonsense. Just know that this conversation is not over." Orochimaru storms out of the room leaving Hiruzen to sigh and think about how to solve this problem.
Just as Hiruzen gets up to leave, his longtime friend and former advisor, Danzo Shimura, enters the room.
"How much did you hear?", Hiruzen asks, already thinking about how much Danzo actually heard.
"I heard enough. Although I agree with Orochimaru that someone more experienced should take up the mantle of Hokage, I cannot deny that I also agree with you, if only somewhat. A Hokage should not only have years of experience, of which that Minato boy does not have enough of, but a Hokage must also be adored by the masses, lest we have a mass protest, or worse, a coup. Such an event would not only weaken, if not destroy the village, but it would also paint us in a bad light, and would no doubt cause our enemies to be enticed into attack us while we are down. Speaking of bad lighting, have you heard the recent rumors regarding Orochimaru?"
"What rumors do you speak of? There are many rumors surrounding my student, most of which are disturbing and untrue, such as the disgusting rumor that he is a pedophile."
"I concur with the notion that that particular rumor is nothing but what it is, a rumor. If there is one thing that your student is, it is not a pedophile. No, the rumor I am asking you about is the one in which people believe that Orochimaru has been kidnapping children from orphanages to use for his experiments."
"Yes, I have been hearing about this, and I have been finding it strange that a few orphan children have gone missing lately, but I have been down in Orochimaru's labs occasionally, and not once did I ever see a human body younger than a teenager, nor did I ever see a body that belonged to that of someone from our village."
"While I may have trust in your judgment on this matter, I would still like to ask your permission to investigate this rumor as a precautionary measure, lest it turns out to be true and come back to bite us."
"If I were still Hokage, I would give you my permission to deploy your ROOT shinobi to investigate. I would even consider it an A- to S-Rank mission. However, because I am no longer the Hokage of Konoha, I no longer have power over this. The person you should be asking is Minato, but I doubt he would sanction the investigation. The shinobi populous still think that you believe in the idea that all shinobi are disposable tools that should have no emotions. That includes Minato."
"Yes, I agree that I have been severely blinded by my beliefs in the past. I must thank you for preventing me from treading deeper down a darker path."
"You are welcome, old friend. Back to the topic at hand, I severely doubt that you would be able to convince Minato to sanction this investigation alone. However, if both of us were to ask him, I have little doubt that he would disagree, especially considering the trust that boy has in me. That amount of trust is only usurped by the amount of trust he has in his sensei, Jiraiya."
"Perhaps you could convince the Toad Sage to agree with me, and to convince Minato to agree as well."
"An excellent idea, but by the time Jiraiya gets back for his report, it would most likely be too late. Therefore, the task falls to us."
"Very well, Hiruzen. I trust your judgment on this matter."
And so the two conspired an idea to convince the Yondaime to give his permission for Danzo to send his ROOT to investigate the snake's den.
Meanwhile, Zetsu is currently spying on the beloved Yondaime Hokage.
'So far', he thought, 'This is going well, this boy is doing well. Although I will still hold from giving him the bloodline for a few years, just in case he dies and the power is wasted.'
And so Zetsu continues to keep watch on the Namikaze orphan.
Zetsu collects his memories of the Yondaime. An orphan boy that declared his desire to become Hokage during his time in the academy, becoming rivals with Kushina Uzumaki, his current wife, who shared the same dream. As he grew, so did his power. One day, while Minato was sleeping, Zetsu planted the idea of a seal version of two Kamiton jutsu, Rasengan and Hiraishin, into his brain. Years later, the Hiraishin was perfected, with Rasengan being incomplete, yet near perfection. Then during the war, he got some students.
Kakashi Hatake, son of Sakumo Hatake, the White Fang of Konoha, who committed seppuku after a 'failed' mission, causing Kakashi incredible grief and to pursue an ANBU career to suppress his emotions. He gained a "The mission comes first, always" mentality, at least until both of his friends and teammates died.
Rin Nohara, a Medic Nin who had a crush on her teammate, Kakashi. She was kidnapped by Kirigakure, The Village Hidden by Mist, in order to be used as a sacrificial Jinchuriki for the Sanbi, a turtle-like Biju. She was to have the Sanbi purposely badly sealed within her and sent back to her village, where the Sanbi would easily escape and cause major damage. However, before the final stage of the plan could take place, Kakashi found the Kiri group along with Rin, killing the shinobi. As he prepared to use Chidori (One Thousand Birds), Rin sacrificed herself by impaling herself on the attack.
Obito Uchiha, a goofball and black sheep of the Uchiha Clan. He was disliked by Kakashi for his carefree attitude and had a crush on Rin, which bloomed into love. During a mission to Kannabi Bridge, Obito was crushed by a boulder and gave his surviving Sharingan eye to Kakashi, who lost one of his during an attack.
Kakashi is the only surviving member of Team Minato, other than Minato, of course. After losing so many loved ones, he became extremely depressed and returned to ANBU. He would later gain a porn addiction and start reading the famous porn book Icha Icha, written by Jiraiya, who would do… research for notes on his next story.
All in all, his Minato sure meets some interesting people. He is an interesting person himself. Though, his wife might be even more interesting, considering the fact that she is the Kyuubi's Jinchuriki.
Kushina Uzumaki, one of the last few Uzumaki after Uzushiogakure, The Village Hidden by Whirling Tides, fell. She has special Chakra Chains and, due to her Uzumaki blood, can live longer than most (Naturally, of course. She can still die before then. She is a kunoichi).
It has been smooth sailing so far. The Yondaime is in his prime, his wife is pregnant, and the Elders haven't bothered him in quite some time. Not even Danzo came to bother him yet.
Zetsu has decided to cut some time off. He decided that he would give Minato the Kamiton a few days after his son would be born. Zetsu believes it's a boy because he has Kamiton Chakra as his blood, therefore he could use the bloodline to see the top 5 most likely outcomes of any event he desires. The most likely outcome of these 5 is that the child will be born a boy. The least likely is that it will be female. Although, just because the baby being male is the most likely outcome doesn't mean that it has a 100% chance of being male.
Zetsu is starting to believe that Minato is the one. At least, that was until the Kyuubi attack.