One interesting plot point could be that the Nidaime's water affinity is somehow connected to a mysterious prophecy. As he discovers more about his water - based powers, he realizes that he might be a key figure in fulfilling this prophecy. This could lead him on a path full of self - discovery, danger, and difficult choices. He might have to face off against those who want to prevent the prophecy from coming true or use his powers in ways he never expected in order to ensure its fulfillment.
Perhaps a plot point could be centered around the Nidaime training a young ninja with potential in water - based jutsu. He could pass on his knowledge and experiences related to his water affinity. This relationship between the mentor (Nidaime) and the mentee could be filled with lessons, challenges, and growth for both characters. For example, the young ninja might struggle with a particular aspect of water control, and the Nidaime has to find a unique way to help them overcome it.
A great fanfiction idea could revolve around the Nidaime's water affinity being passed down through generations. It could show how his descendants in the Hidden Leaf Village also had an inclination towards water - based techniques. The story could detail their struggles and triumphs in learning and mastering these jutsu, inspired by the Nidaime's legacy.
One idea could be exploring the Nidaime Hokage's relationships before he became Hokage. Maybe his friendships with other ninja that influenced his leadership style.
One interesting plot idea could be Naruto discovering ancient techniques that were passed down from the Nidaime. For example, he might find a hidden scroll with a unique water - style jutsu that the Nidaime was known for. Another idea is that Naruto has to face an enemy who is also related to the Nidaime's past and in order to defeat them, he has to understand his own heritage better. He could also go on a journey to the Nidaime's birthplace to learn more about his ancestor and the secrets that lie there.
One plot idea could be exploring the Nidaime Rikudo Sennin's early days. Maybe he discovers a new power that is different from what Naruto has. For example, a power related to nature spirits.
One possible interesting plotline could be the exploration of the Nidaime Otokage's relationships with other Hidden Villages. Maybe he had secret alliances or rivalries that are not fully explored in the original Naruto series.
A fanfiction on this topic could explore how Naruto's godlike water affinity affects his relationships. For instance, Sasuke might be initially jealous of Naruto's new power but later realize they can work together. Sakura could use her medical ninjutsu knowledge to help Naruto better understand how his water affinity can be used for healing. And the village elders might be worried about Naruto's growing power and try to keep him in check. However, Naruto, with his kind heart, uses his power for the good of the village and to protect those he loves.
Naruto could use his godlike water affinity to communicate with water - based creatures. He might be able to understand the language of fish or water spirits. This could give him an edge in battles as he could call upon these creatures for help. For example, he could ask schools of fish to distract his enemies while he prepares a powerful water jutsu.
In Naruto, typically those with an affinity for water are often from certain clans or have a natural inclination towards it. In fanfiction, Naruto could be given a high water affinity to explore new plotlines. Maybe it's a result of some special training with a water - using mentor, or perhaps it's a hidden aspect of his Uzumaki heritage that was previously unknown.
Naruto's high water affinity in fanfiction can be depicted in his battles. He might use water - style jutsu to outmaneuver his opponents in unexpected ways. His water attacks could have special properties, like being able to freeze on contact or carry a healing effect. And in some stories, his water affinity is so strong that he can manipulate the moisture in the air to create water for his jutsu, even in arid environments.
In some fanfictions, Naruto might be given high water affinity to add a new dimension to his powers. Maybe the author wanted to show his versatility. Since Naruto already has strong chakra control for his wind - style jutsu, extending it to water could make him an even more formidable ninja.