I found this idea on Reddit but it was used as a what if so i decided to post it here, I think it would make a really good fanfiction.
I modified the idea little bit more to my liking.
By user: Spidey007
My Scenario:
After fading away in the Fourth Shinobi War, Minato is sent back in time. When Minato opens his eyes again all he sees is destruction and a massive orange fox rampaging in the village while in his hands is the newborn Naruto. (Just before he decided to seal to fox back so after the fight with Obito) This time Minato uses a different seal and seals the Kyuubi in both himself and Naruto without any problems. (Kushina also survived thanks to some bullshit, 🤣)
Why i think my idea is good?
We could get the chance to witness what Narutos life would have been like if his parents survived and we get to see some cool fights like,
Minato vs Orochimaru
Minato vs Pain
Minato vs Danzo
etc
Here is the original idea that is also really good, Minato was sent back in time to teach Naruto during the three year time skip. (I think this idea is better than mine tbh)
Spidey007 Scenario: After fading away in the Fourth Shinobi War, Minato is sent back in time. He is given the three years in the time skip by the Shinigami to train Naruto as much as he could. He reveals his mission to Tsunade and is given the task of training Naruto, but he disguises himself. She tells Jiraiya to take Naruto out of the village but focus on his spy networks, and leave Naruto's training to "Shuji" (Minato's disguise).
So if Minato had been the one to go with Naruto, what would he have taught his son? Would Naruto have come out more stronger/skilled than when training with Jiraiya? What changes in the plot and Naruto's personality/skills?