There could be a fanfiction where the Firestorm element is combined with Naruto's friendship with Sasuke. Maybe in a battle, Naruto uses the Firestorm to save Sasuke from a great danger. This would not only show his power but also the depth of their bond. It could also explore how Sasuke reacts to being saved in such a spectacular way.
One popular Firestorm OC fanfiction could be 'The New Flame of Firestorm'. It might introduce a unique original character who has special powers that interact in an interesting way with Firestorm's abilities. Another could be 'Firestorm: The OC Alliance' where the OC teams up with Firestorm to fight against a common enemy.
One interesting Naruto fanfiction could be those that explore an alternate universe where Naruto becomes a villain. It flips the whole story on its head and shows a different side of the characters. Another type is the ones that focus on Naruto's relationships in a more in - depth way, like his friendship with Sasuke evolving in unexpected ways.
One interesting Naruto fanfiction could be about Naruto learning a new and extremely powerful jutsu from an ancient scroll he discovers. This jutsu gives him an edge in battles against powerful foes like Madara. Another could be a story where Naruto travels to a different dimension and has to team up with alternate versions of his friends to save both worlds.
One interesting Naruto fanfiction could be about Naruto having a secret power that he discovers during a mission in a hidden land. This power could change the way he approaches battles and his relationships with his friends.
Some fanfictions in 2017 could focus on Naruto's family life. For example, how he is raising his children and passing on his skills and values. It could show a more domestic side of the great hero.
One interesting Naruto fanfiction could be about Naruto learning a new and unique jutsu from an ancient scroll. Another might be a story where Naruto and Sasuke have to team up against a completely new and powerful enemy that doesn't exist in the original series. There are also fanfictions that explore what would happen if Naruto was raised in a different village.
One interesting Naruto fanfiction could be those that explore different relationships. For example, a story that delves deeper into the friendship between Naruto and Sasuke, showing their growth and how they support each other in new and unexpected ways. Another could be a fanfiction where Naruto discovers a new power that wasn't in the original series and how he uses it to protect the village. There are also fanfictions that focus on the backstories of minor characters, like how Rock Lee trained even harder than what was shown in the anime.
One interesting Naruto fanfiction could be about Naruto having a different kind of training with an ancient sage. This would change his abilities in unique ways and lead to new adventures. For example, he might learn a completely different set of jutsus that are not part of the original story.
There are fanfictions that focus on different pairings. Like a story about Naruto and Hinata where their relationship develops in a completely different way. Maybe they start training together more often and through that, their bond deepens much earlier than in the original plot. It adds a fresh perspective to their relationship.
To start writing Naruto Firestorm fanfiction, you should do a lot of research on the Naruto world. Know the existing powers, the characters' personalities, and the overall lore. For the Firestorm part, you can be creative. Maybe it's a power that was lost long ago and Naruto stumbles upon it. Outline your story first, with a beginning, middle, and end. For example, the beginning could be Naruto's first encounter with Firestorm, the middle his training and challenges, and the end a big battle where he uses it to save the village.