Maybe Jiraiya found out some dark secret about Naruto's past, like his connection to the Nine - Tails, and decided to keep it from Naruto. When Naruto eventually discovers this, he would be angry at Jiraiya for not trusting him enough to share the truth. This could lead to a rift between them in the fanfiction.
Another reason could be in a fan - created scenario where there are secrets involved. Hinata might be keeping a secret from Naruto that, when revealed, makes Naruto feel betrayed or deceived. This sense of betrayal could easily turn into anger. For instance, if Hinata has a connection to an enemy that she's been hiding from Naruto.
Naruto being angry at Kushina in fanfiction could stem from a feeling of abandonment. Even though she's his mother, if in the fanfiction she was absent during important moments in his life, whether physically or emotionally, Naruto could be angry. He might feel that she didn't fulfill her motherly duties. For instance, if she was more focused on other things like her own past traumas or relationships, and neglected Naruto's needs, that would surely make him angry.
Another reason could be if someone were to slander or disrespect his late mentor, like Iruka or Jiraiya. Naruto holds these people in high regard, and any negative remarks or actions towards them would likely enrage him.
In Naruto fanfic, a common trope related to a few angry words is the 'clash of ideals'. Characters with different views on things like how to handle the Akatsuki or the nature of ninja work might exchange angry words. For example, Naruto, with his belief in saving everyone, might have an angry exchange with a more traditional ninja who believes in strictly following orders. This trope helps to explore the different perspectives within the Naruto universe and also adds drama to the story.
A typical plotline in 'angry naruto fanfiction' is Naruto's anger due to the village's past actions against him. For instance, the way he was ostracized as a child. His anger then causes him to either distance himself from the village or try to make it a better place by changing its ways. Sometimes, his anger is also sparked by threats from outside forces to the village, but the village elders don't believe in him to handle it, which makes him really angry and he takes matters into his own hands.
One common theme is revenge. When Naruto is angry in these fics, often he wants to take revenge on those who have wronged him or his friends. For example, if the village turns against him, he might seek to make them pay.
One common theme is revenge. When Naruto is angry, he might seek revenge against those who have wronged him or his friends. For example, if someone attacks Konoha, Naruto's anger could fuel his desire for revenge on the attackers.
One possible reason could be if Sakura constantly criticizes Naruto's abilities in a very harsh way. In the story, Naruto has always been striving to prove himself, and if Sakura doesn't show any faith in him, it might make him angry.
One reason could be Boruto's recklessness. In fanfiction, Boruto might engage in dangerous stunts or actions that go against Naruto's teachings. For example, if Boruto were to use a forbidden jutsu without fully understanding the consequences, Naruto would be angry as it not only endangers Boruto but also those around him.