It affects the plot in many ways. Firstly, Naruto's character development could take a different turn. Instead of relying solely on his own natural abilities like the Rasengan and Sage Mode, he now has a whole new set of skills at his disposal. This could make him more independent or it could also make him a target for those who fear his power -absorbing ability. And in the long run, it might change the overall goal of the story. Maybe instead of just protecting the village, he now has to figure out how to control and use these absorbed abilities for the greater good.
He could absorb the Sharingan ability. Imagine Naruto with the power to copy jutsus just like a Uchiha. Another interesting one would be the Byakugan. He could gain enhanced vision and be able to see the chakra points even more clearly. Or perhaps the ability to control sand like Gaara. That would be really cool.
In some fanfics, Naruto absorbs the bloodline through a special jutsu. For example, he might find an ancient scroll that contains a jutsu allowing him to transfer and absorb the genetic traits related to a bloodline.
This ability would likely have a huge impact on the plot. Naruto could use it to save his friends by absorbing the souls of those who are about to die and keep them 'alive' in some form within him. It might also make him a target for those who fear his new - found power. And he would probably have to learn to control it, which could be a whole sub - plot in itself.
Impossible abilities can greatly disrupt the plot. For instance, if a character has the ability to teleport anywhere instantly, it can eliminate the need for travel and many of the encounters that were originally part of the story. It can also make battles less interesting as they can easily avoid attacks or reach opponents without any real effort. This changes the whole dynamic of the story.
I recommend "The System: I Am the King of Gluttony" to you. The protagonist Ah Shi accidentally obtained the Glutton System in the Radiant Continent, which could absorb the enemy's ability for his own use. They gradually became stronger in the continuous battle. If you like this kind of theme, this novel is definitely not to be missed. I hope you like this fairy's recommendation. Muah ~😗
In some fanfictions, Naruto's vector abilities open up new storylines entirely. Maybe he discovers a connection between his vector powers and some ancient ninja art. This could lead to him going on a quest to uncover more about it. Or it could lead to him having to protect this new knowledge from falling into the wrong hands. All of these things are ways that his vector abilities can have a major impact on the plot of the fanfiction.
Well, it could change the power balance significantly. If Naruto can absorb bloodlines, he might gain new and unique abilities. For example, he could absorb the Sharingan's power, which would give him enhanced visual abilities and maybe even some of the Uchiha clan's signature jutsu. This would make him an even more formidable opponent and could change the way battles play out. It might also create new rivalries or alliances as other characters react to his newfound powers.
An overpowered child Naruto can also impact the way the Akatsuki is introduced. Instead of being a looming threat that Naruto has to grow to face, they might become aware of his power early and target him sooner. This would completely shift the pacing of the story, as Naruto would be forced into more dangerous situations at a young age. Also, the training arcs would be different. He wouldn't need to go through the same basic training as in the original story, and might instead focus on more advanced and unique techniques that match his overpowered status.
Typically, it adds a layer of drama. In such fanfics, Naruto might be blamed for things he didn't do, like a failed mission or a mysterious incident in the village. This then sets off a chain of events. His reputation gets tarnished, and he may be ostracized. However, this also gives the author a chance to explore Naruto's resilience. He might start to investigate on his own to clear his name, which could uncover secrets about the village or other characters that were previously unknown.
It can change the story plot in many ways. If Naruto looks like a girl in the fanfic, it might attract different kinds of antagonists. Maybe some villains who target women specifically would come after him. Also, his role models like Jiraiya might treat him differently. Jiraiya might not be as comfortable training him in the same way as he did in the original story. This would then force Naruto to find new ways to grow as a ninja, thus altering the plot.