To improve a 'Naruto pissed off' fanfic, the writer could focus on the relationships in the story. Ensure that Naruto's relationships with other characters are portrayed accurately. For instance, if Naruto is interacting with Kakashi, it should be in a way that makes sense based on their past interactions in the original series. Also, get feedback from other Naruto fans. They can point out what's wrong and what can be improved regarding Naruto's portrayal and the overall fanfic.
One way to improve is to add more depth to Naruto's character in the fanfic. Instead of just having him react in a simple, one - dimensional way, explore his inner thoughts and emotions more. For example, when he faces a difficult situation, show how his past experiences shape his decision - making. This will make the fanfic more engaging and less likely to piss off fans. Also, make sure the fanfic has a clear theme or message related to Naruto's growth or the Naruto universe in general.
First, the author should stay true to Naruto's character. By studying his traits like his determination, his loyalty to his friends, and his never - give - up attitude in the original anime. For example, don't make him a coward when he's known for being brave. Second, improve the plot. Make it more logical and in line with the Naruto world. No sudden, out - of - the - blue events that don't fit. Third, work on the writing quality. Use proper grammar and spelling so that readers can easily follow Naruto's journey in the fanfic.