Another fanfiction idea is that Naruto is born with scales due to a prophecy. The scales are seen as a sign of a great destiny, but also make him a target. He has to grow up dealing with the prejudice of the villagers while secretly training to fulfill the prophecy. In this story, the scales could have unique properties like being able to sense danger or store chakra.
One idea could be a story where Naruto discovers his scale - like appearance after a battle in a mysterious dimension. He then has to figure out how to reverse it while also using his new form to his advantage against an emerging threat. For instance, the scales could be like a natural armor that he can enhance with his chakra.
The scales might give him new jutsu capabilities. For instance, he could learn to use the scales to create a sort of dragon - scale armor jutsu, where he can cover himself in a protective layer of scales that also has offensive capabilities, like shooting out sharp scale - like projectiles.
One possibility is that it could be related to some sort of new power or transformation. Maybe it's a result of an experiment gone wrong or a connection to a long - lost bloodline. For example, it could be a remnant of an ancient clan's ability that has been dormant in Naruto all this time.
It might be a gift from a powerful dragon in Naruto's world. In some fanfictions, there are hidden dragons that see potential in Naruto and bestow upon him the power of dragon scales, which could be a symbol of strength and protection.
One idea could be that Naruto discovers he has these powers due to some ancient curse or blessing. He then has to hide it from his friends at first because he doesn't understand it. As he starts to master it, he uses it to protect the village in unexpected ways, like using Mokuton to quickly rebuild damaged areas after an attack while using Sharingan to detect any remaining threats.
An interesting plot could be that Naruto, with his new eyes, discovers a hidden conspiracy in the ninja world that was related to the origin of the Rinnegan and Sharingan. He has to use both his powers to uncover the truth and stop those behind it. For example, he might find out that there is a group that wants to control all the powerful ocular jutsu in the world. With the Sharingan, he can detect their lies and with the Rinnegan, he can take on their powerful minions. Also, he could use the powers to communicate with ancient ninja spirits and gain their wisdom to solve current problems.
One plot idea could be Naruto discovers a new, unique form of chakra control that has nothing to do with bloodlines. For example, he might learn to manipulate natural energy in a way that no one has before, allowing him to perform incredible feats. Another idea is that he focuses on his own hard - worked skills and intelligence to outwit his opponents. He could create his own jutsu based solely on his understanding of the basic elements and his own creativity.
Perhaps in this fanfiction, the hidden blades are not just normal weapons. They could be imbued with some sort of special chakra or magic. This would make them more powerful and give Naruto an edge in battles against stronger opponents like Pain or Madara.
One idea could be that Naruto's split personality represents his inner struggle between his desire for recognition and his fear of being alone. For example, one personality might be overly confident and outgoing, while the other is more reserved and introspective.
One idea could be that Naruto's new fox features give him enhanced senses. He could use his improved hearing to detect hidden enemies or his sharpened sense of smell to track down missing ninjas. For example, in a mission to rescue a kidnapped villager, his new abilities help him find the secret lair of the enemy much faster than his teammates.
Maybe the gunblade was created by a rogue ninja who had a fascination with both modern - day weapons and traditional ninja tools. Naruto gets his hands on it during a mission where he has to stop the rogue ninja from using it for evil purposes. As he uses it, he realizes it has special chakra - enhancing properties that he can use to his advantage in battle.