Suppose in the fanfiction Sakura constantly undermines Naruto's efforts to become Hokage. She might spread rumors or say negative things about his capabilities in front of others. Given that Naruto's dream of becoming Hokage is his life's motivation and something he has worked so hard for, this would surely make him angry. His anger is justified because she is attacking his most precious goal and self - esteem.
If Sakura betrays Naruto's trust in the fanfiction. For example, she might tell Naruto's secrets to the enemy. Naruto has always been very open and loyal to Sakura, so this would be a huge blow to him. His anger would be completely understandable as she would have broken the bond of trust between them.
In a scenario where Sakura physically attacks Naruto out of the blue without any good reason in the fanfiction. Naruto has always considered Sakura as a friend, and an unprovoked attack would be a shock. His anger would be a natural response to such an unjust act. After all, no one would be happy to be physically assaulted by someone they trust and care about.
Danzo could also be the one to make Naruto angry. Danzo's underhanded tactics and secrets might be exposed in the fanfiction, and if they were to directly harm Naruto's friends or the village, Naruto would be furious at his actions.
It could strain their friendship. Naruto might start avoiding Sakura, which would make her realize she's done something wrong and try to fix it.
His anger often manifests physically. His muscles might bulge more than usual, and his hair could stand on end even more in his Super Saiyan forms. His ki, or energy, also becomes more visible and intense. It's like a red - hot aura surrounding him.
In the 'Harry Gets Angry' fanfiction, Harry might get angry when his reputation is smeared. He has always been in the spotlight, and false rumors can really get to him. Also, seeing the weak or the underdogs being bullied can make him angry. He has a strong sense of justice, so any form of oppression or unfair treatment towards others can stir his anger as well.
This kind of fanfiction often goes against the original storyline in 'Naruto' and may not be in line with the general tone of the official work. In the official 'Naruto' story, Naruto ends up with Hinata, and Sakura is with Sasuke. So, while there might be such fanfictions out there, they are more of the wild and uncanonical creations of some fans.
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.
Naruto might be shocked at first. He has always seen Sakura as a friend, so being beaten up by her would be unexpected. He could try to talk to her and figure out what's wrong.
Yes, there might be such fanfictions out there in the vast world of fan - created content. However, it's important to note that fanfictions can vary greatly in quality and adherence to the original spirit of the Naruto series.
His anger could lead to a complete breakdown of their relationship in some fanfictions. Naruto might feel so betrayed or frustrated that he decides he doesn't want to be around Sakura anymore. But in other fanfictions, it could be a turning point for their relationship. Naruto's anger might make Sakura see him in a new light, as someone who has his own boundaries and feelings, and she might start to respect him more, which could improve their relationship.
His family might have neglected him in some ways. Naruto grew up alone and feeling unwanted in the original story. If in the fanfiction, his family was around but still didn't give him the love and attention he needed, it would be a valid reason for his anger. He has always craved connection and acceptance, and if his family failed to provide that, he would be furious.