One possible plot could be exploring the backstory of how the Deva Path came to be in Naruto's world. Maybe it could involve a secret organization that was experimenting with the powers related to the Deva Path long before Pain used it. This could lead to Naruto uncovering this hidden history and having to face new enemies who want to use the Deva Path's powers for evil purposes.
Perhaps in the fanfiction, the Deva Path's powers are spreading among the shinobi world uncontrollably. Naruto has to go on a journey to find the source of this spread. Along the way, he teams up with old friends and new allies. They encounter various challenges and battles, and Naruto has to use his wits and newfound knowledge of the Deva Path to stop the chaos and restore balance to the world of ninjas.
Naruto himself would be an interesting character to pair with the Deva Path. Their different outlooks on life and power could lead to some great character interactions. Naruto's belief in the good in people might even start to influence the Deva Path.
One idea could be exploring the backstory of how the Deva Path came to be in Naruto's world. Maybe it was created by an ancient civilization's experiments. Another could be a fanfic where the Deva Path gains self - awareness and rebels against Pain's control. It could then seek to find its own purpose in the ninja world.
The characters could interact in a very tense way if some of them fear the power of the Deva Path. For instance, if Sasuke initially suspects Naruto of being corrupted by the Deva Path powers, it could lead to a conflict between them. But as they communicate, they might come to understand that Naruto is using the powers for good.
The plot could be that the Animal Path gets separated from its main control in the Naruto world and ends up in a situation where it has to rely on a particular character for survival. As they spend time together, they start to develop feelings for each other. The 'lemon' aspect could be added as their relationship deepens. This could involve some passionate moments between them. Along the way, they might also face challenges from other characters who are suspicious of the Animal Path's true nature and intentions, adding more complexity to the story.
Maybe Naruto starts to understand Sasuke's motives better. He could embrace Sasuke's idea of seeking power for protection, but in a different way. For example, he might focus more on individual strength rather than relying on the village all the time.
Perhaps Hagoromo's brother was wrongly accused of something in the past and sealed away. Naruto discovers his existence and frees him. In return, the brother tells Naruto the true history of the ninja world, including secrets about the origin of chakra that no one else knows. This knowledge helps Naruto to bring about a new era of peace and understanding among all the ninja clans.
The plot might involve Naruto being summoned by Rias's sister by accident. At first, Naruto is confused and a bit frustrated as he was in the middle of something important in his own world. However, as he gets to know Rias's sister, he realizes she has a pure heart. They embark on a journey to find a way to send Naruto back home. Along the way, they encounter many challenges and have to rely on each other's skills. This adventure makes them respect and care for each other deeply.
One possible plot could be that Orochimaru's daughter is initially raised with his dark teachings. But then she meets Naruto. Naruto, with his positive attitude and belief in people, starts to make her question her father's ways. She could then struggle between her loyalty to her father and the new path that Naruto represents.
Well, it could be that Poseidon's Trident has been stolen and Naruto is called upon to find it. He teams up with some of Poseidon's loyal servants or maybe even a mermaid or two. Along the way, he uses his ninja skills to track down the thieves. When he finally finds the Trident, he has to face the main villain who stole it. Naruto might use his Rasengan in combination with the power of the Trident to defeat the bad guy and return the Trident to Poseidon.
One possible plot could be that the daughter has to struggle with her dual nature. Since Naruto is human (sort of, with his Uzumaki heritage) and Kyuubi is a powerful tailed beast. She might be shunned by some in the ninja world who fear her power. But at the same time, she could also be a bridge between humans and the tailed beasts, trying to bring peace and understanding. For example, she could use her unique abilities to stop a new threat that targets both humans and tailed beasts.