One idea could be that Naruto somehow gains the power of the Flame - Flame Fruit. He could use it to create new and powerful jutsu, like combining the fire nature of the fruit with his own chakra to make a super - heated Rasengan. Another plot could involve Naruto using the fruit's power to protect Konoha from a new and powerful enemy that is immune to normal ninja attacks but vulnerable to the unique flames of the fruit.
A cool plot could be that the Flame - Flame Fruit is actually a key to unlocking a hidden dimension in the Naruto world. Naruto, with his friends, embarks on an adventure to find the fruit. Once they get it, they accidentally activate its power and are transported to this new dimension. There, they have to face new challenges and enemies, and Naruto has to figure out how to use the fruit's power to get them back home.
One possible plot could be that Naruto, with the power of the Flame - Flame Fruit, becomes even more powerful in combat. He could use the fire - based abilities of the fruit to enhance his existing jutsu, like adding a flaming element to his Rasengan. This would make him a more formidable opponent against enemies, especially those with water - based techniques.
One interesting plot could be a character with the flame bloodline being exiled from their village due to fear of their power. They then have to journey to prove their worth and that they can use their power for good. For example, they might encounter other outcasts and form a unique group.
Another idea is that the dying will flame represents Naruto's unfinished business. In the fanfiction, it could be that there's a threat to the Hidden Leaf Village that Naruto was aware of before his death. His dying will flame then becomes a guiding force for his friends and family to uncover the mystery and save the village. It might lead them to hidden secrets or new allies.
A plot could revolve around a new threat that is not part of the original Iron Flame story. Maybe a mysterious group with a different kind of magic that challenges the existing order of dragon riders. This would create new conflicts and alliances.
In fanfiction, if Luffy ate the Flame - Flame Fruit, he would gain the power of fire. His attacks could be infused with flames, making his Gum - Gum Pistol even more powerful. He could also use fire to defend himself, like creating a wall of flames around himself.
A possible plot idea is that the little flame dragon gets separated from its family during a great storm. It then has to navigate through unknown territories, facing various challenges such as other dangerous creatures and difficult terrains. Along the way, it meets a group of misfit animals who at first are hesitant to help but eventually become friends and help the dragon find its way back home.
His relationship with his friends might change. They would see him as even more of a powerhouse. Some might be in awe of his new power, while others, like Sasuke, might feel a bit of rivalry. Naruto would also have to learn to control the power of the fruit, which could be a struggle at first. This journey of self - control would make him more mature and responsible. He'd understand the importance of not misusing such a powerful ability and would strive to use it for the good of Konoha and his friends.
In this fanfiction, Naruto's relationships would experience significant shifts. With his friends, they would initially be curious and a bit envious of his new power. However, as time goes on, they would learn to work with it. His relationship with the village elders might change too. They would likely be more cautious about Naruto, fearing the potential destruction that could come with his new, powerful ability. But Naruto, being Naruto, would strive to prove that he can use the Flame - Flame Fruit's power for the good of the village and its people, thus gradually earning their trust back and strengthening his bonds with them in the process.
Another plot idea could be a character who is mysteriously connected to the Silver Flame. They could have powers that are enhanced by it and have to hide this fact from others for some reason, like fear of being experimented on. For example, a new student at Beacon Academy discovers this connection and has to navigate through the challenges while keeping it a secret.
A lot of fanfictions might explore the origin of the Atlas Flame. It could be tied to an ancient civilization that was long forgotten in the Naruto world. A group of ninja researchers start to dig into the secrets of this flame, and they find out that it has a connection to some sort of god - like being from the past. As they uncover more, they also attract the attention of both good and bad forces in the Naruto world.