Yes, there are likely some fanfictions out there with such a premise. Fanfiction writers often come up with creative and out - of - the - box ideas like this. However, it's not part of the official Naruto storyline.
Well, if Naruto were Madara's brother in a fanfiction, it would completely change the Naruto universe. Their power levels combined could make them an unbeatable force. Naruto's positive attitude might have influenced Madara to not go down the dark path he did in the original story. It could also lead to different alliances and battles, with Naruto perhaps trying to reason with Madara and change his view of the ninja world.
In a fanfiction where Naruto is Madara's older brother, it could completely change the Naruto universe's dynamics. For example, Naruto's ideals of peace and friendship might have influenced Madara at a young age, preventing him from going down the dark path he did in the original story. Naruto could have taught Madara about the power of bonds, which was something Madara seemed to have lost sight of later in his life. This would lead to a different series of events, perhaps even averting the many wars that took place in the Naruto world.
Fan Xian did not tell Lin Wan 'er that he had killed her brother. Fan Xian chose to hide the truth of Lin Gong's death because he was worried that Lin Wan 'er would be heartbroken and might do something extreme. Fan Xian believed that telling Lin Wan 'er the truth would cause her great harm. So, Fan Xian did not tell Lin Wan 'er that he had killed her brother.
Fan Xian did not tell Lin Wan 'er that he had killed her brother, Lin Gong. Fan Xian chose to hide the truth of Lin Gong's death because he was worried that telling Lin Wan 'er would cause her great harm. Fan Xian believed that if Lin Wan 'er knew that her brother's death was related to him, she might be heartbroken and do something extreme. Therefore, according to the information provided, Fan Xian did not tell Lin Wan 'er that he had killed her brother.
One possible motive could be if his brother was somehow a threat to the village. Naruto is very loyal to Konoha, so if his brother was planning to destroy it or harm its people, Naruto might feel compelled to stop him at all costs.
Fan Xian did not tell Lin Wan 'er that he had killed her brother, Lin Gong. Fan Xian chose to hide the truth of Lin Gong's death because he was worried that telling Lin Wan 'er would cause her great harm. So, Fan Xian did not tell Lin Wan 'er the truth about killing his brother.
One common theme is loyalty. Their loyalty to each other as brothers is often explored, whether it's tested by the events in the ninja world or by their own personal goals. For example, in many fanfics, they have to choose between their loyalty to the clan and their loyalty to each other.
Yes, there might be such a fanfic in the vast Naruto fanfic community. Some fanfic writers like to create unique and unexpected relationships between characters. However, it's not a part of the original Naruto storyline, so it's all about the creativity of the fanfic authors.