Well, in some fanfictions, it could be due to a special chakra manipulation technique. Maybe he discovers a new form of chakra that has the properties of lightning, allowing him to transform into it. This could be something he stumbles upon during a difficult battle or while training in a mysterious place.
It could also be the result of a genetic mutation or a hidden ability within his Uzumaki heritage. The Uzumaki clan is known for their strong life force and unique chakra, so it's possible that there is some latent ability that allows Naruto to turn into lightning. He might have to unlock this ability through intense emotional experiences, like when he's protecting his friends or facing a great threat to the village.
Well, in many such fanfics, Naruto might achieve it through intense training. He could focus on mastering new jutsus, like some super - rare or advanced ones. Also, he might gain a deeper understanding of the ninja way, perhaps by facing and overcoming some really tough moral dilemmas.
One implication is that his speed will increase tremendously. Lightning is known for its quickness, so Naruto would be able to move at lightning - fast speeds, making it difficult for his enemies to track or counter him. This would give him an edge in battles, especially against opponents who rely on slow - moving attacks or are not as agile.
Well, Naruto could become a true ninja in this fanfiction by learning the true meaning of ninja. It's not just about power but also about protecting the village and the people he loves. He might have faced some tough moral choices that tested his ninja way. By sticking to his beliefs and growing from these experiences, he becomes a true ninja.
Some fanfictions suggest that Naruto achieves the Rinnegan as a result of intense training in a new form of chakra control. He might discover a way to tap into a deeper level of his own chakra, which has been dormant all this time. As he delves deeper into this new form of chakra manipulation, his eyes start to change. Over time, with continuous practice and facing numerous challenges that push his limits, his eyes finally transform into the Rinnegan. It could also be that he has a genetic predisposition that was activated by a specific event in the fanfiction, like coming into contact with a particular type of energy or meeting a certain character.
Well, in many fanfictions, Naruto might learn black lightning through intense training. Maybe he gets some special guidance from a powerful shinobi who has mastered it, like Kakashi or some other unknown but strong character. He could also discover some ancient scrolls that contain the secrets of black lightning.
Another way could be as a result of a special encounter. Maybe he discovers a hidden scroll or a mysterious artifact that imparts the power of lightning control to him. This discovery could be accidental, like when he's exploring an ancient ruin or during a battle when he stumbles upon something unexpected.
Another possibility is that he gets help from a powerful ally. This ally could be a sage or a spirit who bestows upon Naruto the power of invisibility. They might see Naruto's potential and the importance of his mission and decide to give him this special ability. It could also be a side - effect of a powerful transformation he undergoes, like a new sage mode or some other super - powered form that has the added benefit of making him invisible.
In fanfictions, Naruto might master the Lightning Blade through intense training. He could start with basic chakra control exercises, focusing on the element of lightning. Maybe he has a special mentor in the fanfic who guides him in molding his chakra in the precise way required for the Lightning Blade.
Naruto could achieve an absolute defense by combining different ninja techniques. He might merge his Rasengan with a sealing jutsu to create a spherical defense that is both offensive and defensive. The Rasengan's spinning chakra could be harnessed in a way that it not only attacks but also forms a shell around him that nothing can penetrate. Also, his experiences in different battles might lead him to innovate a new jutsu specifically for defense. For instance, after facing a particularly difficult opponent, he figures out a way to reverse the flow of his chakra to create a repelling force that acts as an absolute defense.
In some fanfictions, Naruto might learn to use black lightning through special training with a powerful ninja who has mastered it. Maybe he discovers a new chakra nature within himself that allows him to manifest the black lightning.