It could be the center of a power struggle. Different ninja groups or characters might want the Raijin Sword for themselves. Some may want it for its power, while others may want to keep it out of the wrong hands. This can create a lot of conflict and drama in the fanfic. The main character could be caught in the middle of this struggle, either trying to protect the sword or having to decide who is worthy of wielding it.
One idea could be that the main character discovers a hidden power within the Raijin Sword that gives them the ability to control lightning in a unique way. For example, they can transform the lightning into various shapes to attack or defend.
The 'naruto raijin no ken fanfic' may have a plot that delves into the origin of Raijin no Ken. Maybe it was an ancient weapon lost in time that Naruto discovers. He then has to uncover the secrets of how to use it properly. This could involve seeking out old scrolls or meeting sages who have some knowledge about it. As he progresses, he might use it to defend Konoha from a new, powerful threat that normal jutsu can't handle. His friends may also be involved, some might be skeptical about this new power while others support him wholeheartedly.
It could be a rogue ninja who also has a connection to the Raijin Sword. Maybe he was once a guardian of the sword but was corrupted by its power and now wants to use it to rule the ninja world.
The Raijin Sword in the fanfiction might have an ancient origin. It could be a weapon forged by a powerful ninja clan in the past. Maybe it was created to combat a great evil that once threatened the ninja world. And for some reason, it has now come into Naruto's possession.
His relationship with Sasuke could be affected. Sasuke might be intrigued or even jealous of Naruto's new weapon. This could lead to new rivalries or, on the other hand, a new level of respect between them.
In the 'naruto raijin no ken fanfic', Naruto is likely to be the central character. However, we could also see characters like Kakashi. He might play a mentoring role, having some knowledge about Raijin no Ken from his past experiences or research. Additionally, villains or antagonists would also be important characters. They could be after the Raijin no Ken for their own evil purposes, which would put them in direct conflict with Naruto.
One interesting 'raijin naruto fanfic' could be about Raiden (from Mortal Kombat) somehow being transported to the Naruto universe and having to team up with Naruto to fight a common enemy. This would bring in Raiden's god - like powers and Naruto's ninja skills together in a unique way.
Maybe the Raijin Sword is actually a key to an ancient realm. The story could follow Naruto as he embarks on a journey to this realm, facing many challenges along the way, all related to the secrets of the Raijin Sword.
The Raijin Sword could also have some sort of connection to Naruto's chakra or his Nine - Tails power. It could potentially unlock new forms or power - ups for him. For example, the sword's energy could combine with the Nine - Tails' chakra, creating a unique and extremely powerful attack.