In some fanfics, Naruto might gain new powerful jutsus through intense training with a hermit or by unlocking some hidden bloodline limit. Maybe he discovers a new form of chakra control that gives him an edge over his enemies.
He could be feared by the remaining ninja. Since he has killed all his enemies, others might see him as a ruthless killer rather than a hero. This could lead to isolation as people would be scared to approach him.
In other cases, it might be a result of a curse or a spell gone wrong. His enemies could be trying to harm him with a dark spell, but instead, it backfires and he ends up absorbing their power. For example, if they were trying to drain his own power but the spell reversed on them.
His friends like Sasuke and Sakura could be his allies. Sasuke might be initially skeptical but then see the potential of Naruto's arcane power in fighting common enemies. As for enemies, Orochimaru could be interested in Naruto's power for his own experiments. He might try to capture Naruto to study and steal his arcane abilities.
In some fanfics, Naruto might use his new and powerful jutsu that he has mastered over time. Maybe he combines his Sage Mode with the power of the Nine - Tails in a unique way that Orochimaru can't counter. For example, he could use the Nine - Tails' chakra to enhance the range and power of his Sage Mode attacks, and then catch Orochimaru off - guard.
I'm not entirely sure specifically what a 'naruto kills fanfic' is. It could be a fan - made story where Naruto kills someone in a non - canonical or creative scenario. It might be a very specific plot within the Naruto fanfiction community that focuses on Naruto taking a life, perhaps in a dark or alternate universe story.
Allies could include his usual friends like Sasuke and Sakura. Since Naruto has the connection to All Might, they might see him as an even greater leader and support him more strongly. Kakashi could also be an important ally, guiding Naruto on how to combine his newfound 'All Might - like' qualities with his ninja skills. As for enemies, Orochimaru might be interested in Naruto's new power source and try to steal it for his own evil purposes. The Akatsuki could also view Naruto as a major threat now that he has additional power and try to eliminate him.
Boruto might be in awe. He would probably look at Naruto with wide - eyed wonder, realizing just how powerful his father is.
<Fantasy: I, the Divine Son of the Imperial Race!> Kill All Enemies was a fantasy novel written by Wang Wang. The story was about the protagonist, Ye Huang, who traveled to the Deserted World and became the divine son of the Immortal Emperor Race. He possessed the invincible power of the Heavenly Dao and could easily suppress all enemies in the world. The novel's plot was full of ups and downs, and it was very exciting. It was very popular among readers. Currently, the latest chapter of the novel was chapter 58,"Yin Demon Old Man."
The mental aspect of his training could also be different. Having all of Kurama sealed within him might put more strain on his mind. So, his training could include more mental fortitude exercises. He might need to learn how to deal with Kurama's full - fledged influence on his thoughts and emotions, which could be much more intense compared to the original situation where only part of Kurama was initially accessible.