There are several popular plot devices. The first is the 'training arc' where Naruto trains intensively to gain the power to defeat the Akatsuki. This could involve learning from a long - lost master or uncovering a new chakra source. Another plot device is the 'information leak'. Some minor character in the Naruto world might accidentally or deliberately give Naruto crucial information about an Akatsuki member's location or weakness. Also, the 'race against time' plot device is used, where Naruto has to kill an Akatsuki member before they complete a dangerous ritual or mission that would endanger the whole ninja world.
One popular plot device is the power - up. Naruto might gain a new form or a super - powerful jutsu right before facing an Akatsuki member. Another is the betrayal within the Akatsuki. For example, someone in the Akatsuki might give Naruto information to help him in the fight. And the 'damsel in distress' can also be used, like Naruto has to save a friend from an Akatsuki member, which leads to the fight and the kill.
One common plot device is mind control. For example, Voldemort or some other dark force could control Harry's mind and make him kill Dumbledore without his full awareness. Another is a misinterpreted prophecy. Harry might think Dumbledore is endangering his life based on a wrongly understood prophecy.
A typical plot device could be a power - up related to their brotherhood. Since Naruto has his chakra and Trunks has his Saiyan strength, they might discover a new combined power because they are brothers. Also, there could be a time - travel element involved. Trunks is associated with time travel in Dragon Ball, and this could be used in the fanfiction to explain how Naruto and Trunks' relationship came to be. For instance, Trunks could travel to the Naruto universe and somehow become related to Naruto through some time - warped event.
In many such fanfictions, the power struggle plot device is used. If Sakura becomes too powerful or tries to assert her dominance in a way that overshadows Naruto and Hinata's relationship or their own achievements, they might start to hate her. For example, if Sakura gets a high - ranking position in the village and starts making decisions that affect Naruto and Hinata negatively, it can fuel their dislike. Another aspect is the character arc plot device. The writer might give Sakura a negative character arc where she becomes more self - centered or greedy, which would make Naruto and Hinata dislike her.
Well, perhaps in the fanfiction, Naruto kills Orochimaru and the Akatsuki, but it turns out that Orochimaru had a failsafe. His death triggers a powerful curse that starts to affect Naruto and the Hidden Leaf Village. Naruto then has to find a way to break this curse while also dealing with the remaining threats that were associated with the Akatsuki. It could be a race against time to save the village and himself.
For such a plot to be possible in the fanfiction, it could involve some major changes in the Naruto world. The Akatsuki could have some new secret weapons or techniques. Also, Naruto might be in a situation where he is not able to access his full power, like being poisoned or something. And perhaps the Akatsuki are more united and desperate than ever to achieve their goals, leading them to take out Naruto who is a major obstacle for them.
In a fanfiction where Naruto kills the Akatsuki, it could lead to a much more peaceful ninja world much sooner. The Akatsuki's plan to capture the tailed beasts was a huge source of unrest. With them out of the picture, the villages might not be as paranoid about security. However, it could also lead to new problems. The power vacuum left by the Akatsuki could be filled by other evil forces or there could be internal power struggles within the villages that were previously united against the Akatsuki threat.
The most obvious consequence would be chaos. Naruto was the hope for the village. His death would likely lead to a great sense of despair among the villagers. Konoha might lose its strength and confidence.
Another plot device could be a mind - link or a shared vision. Maybe Naruto has a moment where he links minds with a past Hokage who was an expert in Rasengan. Through this connection, he gains instant knowledge on how to form and use it. It's a more supernatural way of learning compared to the traditional training.
One common plot device is the alteration of major events in the Naruto timeline. For example, a time - traveling Naruto might prevent the Uchiha massacre, which would have huge ramifications for the entire shinobi world. Another is the transfer of knowledge from the future. The time - traveling character could introduce new jutsu or battle strategies that hadn't been thought of in the past. Also, there's often the theme of self - discovery as the character sees their past self or predecessors and gains a new understanding of their own path and purpose.
The redemption arc of some Death Eaters can also be a plot device. In some fanfictions, Harry tries to save some of the Death Eaters who he believes can be redeemed. This adds a layer of complexity to the story as he has to balance his desire for revenge with his moral compass. He may end up sparing some Death Eaters who then help him in his fight against the more hardcore ones.