It's also about the potential for character growth. In fanfics, we can see how they influence each other. Himawari might help Kawaki open up more, and Kawaki could teach Himawari about the harsher side of life. This mutual growth and the exploration of their relationship make the fanfics popular.
It could also be related to a prophecy or a pre - determined fate in the fanfic's plot. There might be some kind of dark prophecy that says Kawaki has to kill Naruto to prevent a greater evil. Or perhaps Kawaki is being controlled by an external force that has a vendetta against Naruto and uses Kawaki as a tool to carry out the murder.
Nagato was a character in the Japanese anime " Naruto " and its derivative works. He was the leader of Rain Hidden Village and the controller of Pei En Six Paths. Zhangmen had the Reincarnation Eye and powerful ninjutsu. He could use forbidden techniques such as the Earth Explosion and the Stars. He was very powerful. However, Nagato was not the strongest character. There were many ninjas in Naruto who were stronger than him.
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Many of Naruto's friends and allies would be filled with rage. Characters like Sasuke would probably seek immediate revenge on Kawaki. The other villages might also see this as a sign of instability in the Hidden Leaf and could either try to take advantage or offer help depending on their relationships with the Leaf. And the younger generation, like Boruto, would be deeply affected. He would have to deal with the loss of his father and might struggle with his own identity and purpose in a world without Naruto.
Kawaki could be developed by showing his softer side when he is around Himawari. For example, he might start to open up more about his past traumas. Himawari, on the other hand, can be shown to become more confident in her abilities with Kawaki's support.
One common theme is friendship. Writers often explore how Himawari and Kawaki, who come from different backgrounds, form a bond of friendship. Another theme is growth. They both grow as characters, learning from each other.
Kawaki makes his appearance in Boruto manga at a specific point, but I can't recall exactly. You might want to check the official manga sources for the precise chapter.
Saitama's strength in the manga comes from his intense training and unwavering determination. He pushed himself to the limit every day, which eventually led to his overwhelming power.