Perhaps the fanfic could focus on Naruto's discovery of a powerful and ancient jutsu during the 2nd War. He then has to keep it a secret while also trying to figure out how to use it to help his side in the war. This would add an element of mystery and power - up to his character in the story.
One possible plotline could be Naruto getting involved in a special mission during the 2nd War. Maybe he has to rescue a group of ninja who are trapped behind enemy lines. This would show his courage and skills as a young ninja.
Another plot could revolve around Naruto making unexpected alliances. In the chaos of the 2nd War, he might team up with some ninja from other villages who share the same goal for a short period. This could lead to some interesting character interactions and growth for Naruto as he learns about different ninja cultures.
Maybe in the fanfic, Naruto and Hinata work together to rebuild the village. They use their unique skills and influence. Naruto, with his leadership skills and powerful jutsu, and Hinata, with her Byakugan and knowledge of the Hyuga clan's techniques. Their teamwork could strengthen their bond even more. And also, they might encounter some old enemies who are trying to take advantage of the post - war confusion, and they have to fight side by side again.
Perhaps a plotline where a single character rises to power in the midst of the war on ruins. They start as an underdog but through their wits and strength, they gain followers and begin to shape the future of the post - apocalyptic world. This could involve political intrigue, alliances, and betrayals as they climb the ladder of power.
One possible plotline could be Naruto being adopted into the Uchiha clan early on. He might then learn the unique Uchiha jutsus and secrets at a young age. This could lead to him having a different relationship with Sasuke, perhaps as a brother - like figure within the clan.
One possible plotline could be a comical take where Naruto, perhaps as a baby or in a situation where he's regressed to a younger state in diapers, accidentally uses his newfound baby - like clumsiness to his advantage in a prank - like way against his friends. For example, he might 'accidentally' spill something on someone while being carried, leading to a series of funny events.
One possible plotline could be that Naruto and Ino are on a mission together. They start off bickering like they used to in the original series, but as the mission progresses, they begin to understand each other better. For example, they might face a powerful enemy that forces them to rely on each other's unique skills. Naruto's brute strength and Ino's mind - control abilities could complement each other in combat. Another plotline could be a more emotional one where Ino helps Naruto deal with his inner demons related to his past. She could use her skills to get inside his head in a more positive way and help him come to terms with things.
Perhaps a plot where Himawari discovers a new and rare chakra ability, and Naruto helps her to understand and control it. They might go on a journey to find someone who can further teach her about this power. This could involve meeting old friends of Naruto's along the way and having various adventures together.
Perhaps there could be a love story in the 'war of light and shadow fanfic'. A character from the light falls in love with someone from the shadow side. Their relationship becomes a key factor in the war as they try to bridge the gap between the two opposing forces. This could lead to various conflicts and reconciliations.
A plotline could involve Islamic mythology or figures somehow making their way into the Naruto universe. Maybe an Islamic - inspired spirit or entity appears in the Hidden Leaf Village and has to be dealt with, and the characters learn about Islamic beliefs in the process.
One possible plotline could be Naruto ending up in Alois' world and having to adapt to its different rules and power dynamics. He might use his ninja skills in unexpected ways to survive and make a name for himself.
A possible plotline could be Naruto and his friends being transported to the WW2 era. They then use their ninja skills to try and stop the war. Or perhaps they side with one of the Allied forces and help them in their battles. Another plotline could be that a powerful Naruto villain teams up with a WW2 dictator and they create chaos together. The heroes have to then find a way to defeat this unholy alliance.