No. Fanfiction is a form of creative expression. Naruto fans write fanfiction to explore different ideas and stories within the Naruto world. Just because someone doesn't like it doesn't mean it should be 'killed'.
One idea could be that Naruto and Sasuke are somehow transported to the world of Kill la Kill. They might get involved in the fight against the Life Fibers, with their ninja skills being a unique addition. Maybe Naruto's Rasengan could be used to disrupt the Life Fibers in a new way.
Power dynamics is often a theme. In both Naruto and Kill la Kill, power is important. In a harem fanfic, the main character might be in a position of power or might be trying to gain power while dealing with multiple romantic interests. For example, a character could be using their ninja skills in the Kill la Kill world to impress potential partners. Another common theme is friendship and loyalty. As the main character forms relationships with different characters from both series, the bonds of friendship and loyalty can be explored, especially when it comes to choosing between different love interests.
One interesting crossover is when the ninjutsu from Naruto is combined with the combat style of Kill la Kill. For instance, Naruto using his shadow clone jutsu while Ryuko uses her scissor blade attacks in tandem. It creates a very dynamic and visually appealing fight sequence.
One aspect of this fanfiction could be the exploration of the harsh realities within the Naruto universe. It might show characters being forced to make difficult choices between killing their opponents or being killed themselves. This could lead to a deeper understanding of the moral gray areas that exist in a world full of ninja battles and power struggles.
Sure. One popular 'naruto and kill la kill fanfiction' might be the ones that explore the characters from both universes teaming up for a special mission. For example, Naruto and Ryuko could join forces to fight a common enemy that somehow threatens both their worlds. It could be an interesting concept as Naruto's ninja skills and Ryuko's kamui powers would make for an exciting combination.
Maybe Kakashi could be the one. He's always been Naruto's mentor in many ways. He has the knowledge and skills to train Naruto for such an unusual task. He could use his Sharingan to analyze the fanfiction and teach Naruto how to spot the dangerous elements within it.