One interesting plot idea could be exploring how Minato's relationship with the Kyuubi affects Naruto. For example, Naruto discovers some hidden memories of Minato's encounter with the Kyuubi that give him new powers or insights. Another idea is a story where Minato has to return from the afterlife briefly to help Naruto control the Kyuubi's power more effectively. Maybe there could also be a plot where the Kyuubi has a change of heart due to Naruto's kindness and decides to reveal secrets about Minato that no one else knew.
One idea could be exploring how Kushina and Minato's relationship influenced Naruto's growth. For example, in the fanfic, Naruto could discover old letters from his parents that reveal their hopes and dreams for him. This would add an emotional depth to his character.
The plot could involve the child being sought after by various ninja clans who want to use the power of the Kyuubi within the child for their own purposes. The child, with Naruto's teachings, resists and tries to find a way to use the power for the good of the village. Maybe the child discovers a new form of chakra control that combines Naruto's Uzumaki heritage and the Kyuubi's power.
One idea could be exploring the relationship between Naruto and the Kyuubi no Kitsune in a more spiritual way. Maybe Naruto can have dreams where he actually communes with the fox spirit and gains new insights about his powers. Another plot could involve a situation where the Kyuubi's powers start to merge with Naruto in unexpected ways, causing him to develop new abilities that he has to learn to control quickly.
One idea could be that the female Kyuubi has the ability to transform into a human form and she becomes Naruto's secret protector. She uses her powers subtly to keep him out of harm's way while he's on his missions, and Naruto starts to notice strange things happening but doesn't know it's her at first.
One idea could be that the power transfer is not straightforward. Maybe Kyuubi's power starts to change Naruto's appearance in unexpected ways, like giving him fox - like features that he has to learn to hide. This could lead to some comical and also tense moments as he tries to keep it a secret from his friends.
A really interesting plot could be that the Kyuubi bloodline in Naruto starts to have an effect on his relationships. Some people in the village might be afraid of him now that they know he has this powerful bloodline. On the other hand, some might see him as an even greater asset. Naruto then has to deal with the social implications while also training to control the new powers that come with his Kyuubi bloodline. He could also find out that there are other ninja out there with a similar bloodline from other tailed beasts, and they come together to form a unique group.
Maybe in the fanfic, Naruto gets injured while protecting the Fem Kyuubi from some other powerful force. This act of self - sacrifice makes her realize her deep love for him. Then, they start to train together, not just for power but also to strengthen their bond, sharing their secrets and fears during the process.
Well, in some fanfics, the Kyuubi's obsession might result in it influencing Naruto's chakra in a unique way. This could lead to Naruto developing new and unexpected jutsu. Also, the Kyuubi could be so obsessed that it tries to merge with Naruto in a different way than just lending its power, like actually becoming one entity with Naruto but still maintaining their individual consciousnesses to some extent.
One idea could be Minato teaching Naruto how to master the Rasengan at a very young age. Since Minato was the creator of it, he could pass on his in - depth knowledge. Another plot could be Minato protecting Naruto from the early threats that Naruto faced in the original story, like the Akatsuki's early interest in him. Also, Minato could introduce Naruto to the other powerful ninjas of the Hidden Leaf in a more personal way, which would change Naruto's relationships and his standing in the village.
One plot idea could be Minato somehow being brought back to life for a short time and getting to spend precious moments with toddler Naruto. He could teach Naruto some basic ninja skills that Naruto would later forget but unconsciously use in his training. Another idea is a story where toddler Naruto is in danger and Minato's spirit appears to protect him, guiding Naruto to use his own latent powers. And perhaps a story where Minato's memories are transferred to toddler Naruto, giving him flashes of his father's life.