Well, often they use the idea of Naruto's strong will. They say that his will is so strong that it breaks the normal limits of what is possible in the Naruto universe. So, his will allows him to access these impossible powers. Also, in some fanfictions, Naruto goes through some extreme and unique training or experiences that no one else has had, and this is what gives him these extraordinary abilities. For example, he might travel to a different dimension where the laws of physics and chakra are different, and when he comes back, he has these new powers.
Fanfiction writers sometimes justify it by introducing new elements to the Naruto world. They might create new types of chakra or energy sources that Naruto can tap into. For example, there could be a 'divine chakra' that only Naruto can access due to his special heritage. Or they might say that Naruto's bond with his friends and the village is so strong that it manifests as these impossible powers. His desire to protect everyone and his love for his friends and home somehow unlocks these powers that are beyond the normal scope of the Naruto universe.
Chapter 176, ", Making Dumplings", is the clearest early answer because it turns Anti's situation into a concrete plot event. A useful checkpoint is the way the scene starts with He stared blankly at the pitch-black muzzle as it emitted a burst of... and follows through with This is the second time content was deleted without my knowledge;....
Chapter 200, ", The Governor's Concept of the Phoenix", is the clearest early answer because it turns Anat's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Before the surgery began, Anat and his two friends were all quite... and follows through with The genetic seeds provided by the Governor have very ideal viability.. By the close, This process could take anywhere from six months to two years,..., and the chapter closes with "Of course, it's okay.
Chapter 83, ", Is This the CPU?", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. It opens with Gu Hang spoke with an attitude that seemed earnest, as if he were not... and closes on In the many city-states of the Eastern Province, each with a.... The key payoff is that the chapter closes with At this thought, Bradford suddenly came to a realization: Eh?
Chapter 208, ", Am I becoming the head of the provincial government now?", is the clearest early answer because it turns Spiritual Energy's situation into a concrete plot event. A useful checkpoint is the way the scene starts with However, after the last disaster, most of the Spirit Energy fields on... and follows through with I was just an employee at a small company in Revival City, and in....
Chapter 45, ", The Governor Will Make a Move", is the clearest early answer because it turns Perbov's situation into a concrete plot event. The setup is Perbov felt a chill in his heart., but the pressure keeps building through He understood all too well what would happen if these monsters....
Chapter 134, ", What Trash is the Agent?", is the clearest early answer because it turns Loyal Heir Academy's situation into a concrete plot event. The chapter turns that into something concrete by moving from The construction of schools was entrusted to Osenia by Gu Hang, who... to Even if the content taught isn't good enough yet, it will at least....
Chapter 208, ", Am I becoming the head of the provincial government now?", is the clearest early answer because it turns Ge Wajia's situation into a concrete plot event. The setup is However, after the last disaster, most of the Spirit Energy fields on..., but the pressure keeps building through The howling, unconstrained force of Spiritual Energy formed various....
Chapter 58, ", indeed, one must not accept fate.", is the clearest early answer because it turns Wu Jiarong's situation into a concrete plot event. Early on, Was the power under Governor Gu Hang truly a technological wasteland?. By the end, The governor was coming soon, and she had no other choice; she.... Inside the broader family politics storyline, the chapter closes with "Do you believe in it?, which gives faction conflict a stronger narrative position and pushes the power growth onward.
Chapter 137, ", Beast Slaughter Group (6.4k Subscriptions Please!)", is the clearest early answer because it turns Li Kexi's situation into a concrete plot event. The setup is Swan said he would find a way to deal with it., but the pressure keeps building through He wasn't just going to handle those who wanted to flee; he would....
Chapter 90, ", Corpse Bomb", is the clearest early answer because it turns Georgette's situation into a concrete plot event. The setup is Through Georgette's keen eyes, the governor's soldiers who had just..., but the pressure keeps building through The bullets were accurately and meticulously sent into the heads and....