It might be an existing Naruto character like Deidara. He already has an affinity for explosives in the original series, so in the fanfiction, he could be further developed as an even more powerful explosive master, with new techniques and a more in - depth backstory.
It could be an original character created specifically for the fanfiction. Maybe a young ninja who has a natural talent for explosives.
Another possibility is that the main character could be a mysterious outsider who comes to the Naruto world with knowledge of unique explosive arts. This character could be from a far - away land or even a different dimension, and their explosive skills could be completely different from what the Naruto characters are used to, which would create interesting interactions and storylines.
Rock Lee could be a great main character. He's known for his taijutsu skills, and adding the Explosive Fist to his repertoire would make for an exciting story. He could use it to overcome his limitations in ninjutsu and genjutsu and prove himself even more as a powerful ninja.
In this 'naruto explosive master fanfiction', it could center around a group of characters who discover ancient explosive techniques. These techniques are so powerful that they attract the attention of both good and bad forces in the Naruto world. The explosive master character, whether it's an existing Naruto character or a new creation, has to protect these techniques from falling into the wrong hands. Along the way, they might learn about the history of these techniques and how they were once used to either create peace or cause great destruction in the past.
It could be an original character. For example, a young ninja who has a natural talent for katana - wielding but comes from a family of non - combatants. They struggle to gain acceptance in the ninja world while also mastering the katana. Or perhaps a wandering samurai - like figure who stumbles into the Naruto world and has to adapt to its unique ninja culture while showing off their katana skills.
It could be Naruto himself. Imagine Naruto learning the art of forging to create a special weapon that can harness his chakra in a new way. He might do it to become stronger and protect his friends and the village.
It could be an original character created by the fanfiction writer. Someone who has dedicated their life to mastering the Kawarimi technique.
It could be an original character created specifically for the fanfiction. This character might be someone who was initially not very good at ninjutsu but discovers a special affinity for the kage bunshin technique and then devotes themselves to mastering it.
I think Sasuke could be a great main character. He already has an affinity for lightning - based attacks. In a fanfiction, he could further develop his Raiton skills and become an even more powerful Raiton master. He could use his new - found skills to seek revenge in a different way or to protect the village in a more unique manner.
It could be an original character created specifically for the fanfic. A young ninja who discovers their talent for making traps early on and decides to master it.
It could be Naruto himself. Imagine if Naruto, instead of focusing solely on his regular jutsu, delved into the world of kinjutsu and became a master at it. His never - give - up attitude would make for an exciting story as he overcomes the difficulties of learning this new type of jutsu.
A new character could be introduced as a Sharingan master. For example, a wandering ninja who has been secretly studying the Sharingan for years. He might have no allegiance to any village and travels around, looking for worthy pupils to inherit his knowledge. He could have unique techniques related to the Sharingan that no one has seen before.