Yes, there are likely some out there in the vast world of fanfiction. Fanfiction writers often come up with unique and unexpected crossovers like this. However, the quality and popularity can vary greatly.
Yes, there are some out there. You can start by looking on popular fanfiction websites like Archive of Our Own or FanFiction.net. Just search for the specific tag'superman kills batman' and you'll find a variety of stories. However, the quality can vary greatly from one to another.
You need to consider their different backgrounds. Superman has his Kryptonian heritage and his experiences in the Injustice 2 world. The reader could be from a more ordinary background. Show how these differences can both create friction and also draw them together. For instance, the reader might teach Superman about the simple joys of Earth life that he's forgotten in his pursuit of justice, which deepens their connection.
One possible reason could be mind control. Maybe some villain has taken over Superman's mind and made him do it. Another reason might be a fundamental difference in their ideologies that has escalated to the point of no return.
One common theme is the corruption of power. Maybe Superman's power has gone to his head, and Batman sees the need to stop him at all costs. Another could be a mind - control scenario where Superman is being controlled by an outside force and Batman has no other option.
A 'Naruto kills Superman' fanfiction could be a complex and exciting read. Naruto would have to find a way to counter Superman's strength, flight, and heat vision. Maybe he would team up with some of his ninja comrades at first to study Superman's abilities. He could use his ninjutsu to create illusions and misdirect Superman. Once he figures out a strategy, perhaps using a combination of his most powerful jutsu like the Tailed Beast Bomb. It would also depend on the rules set in the fanfiction world, such as if there are any limitations on Superman's powers or if Naruto has any new abilities or enhancements. The story could also explore the moral implications of Naruto killing Superman, which could add depth to the narrative.
Obviously, Batman and Superman are the most prominent. Their complex relationship, which is a mix of friendship, rivalry, and ideological differences, makes them central to any fanfiction in this universe. However, characters like Wonder Woman also often play important roles. In some fanfictions, she may be caught in the middle of the Batman - Superman conflict, trying to mediate or having her own stance on the events that unfold.
One interesting storyline could be a redemption arc for Superman. In the Injustice universe, Superman has gone down a dark path. A fanfiction might explore how Batman tries to bring back the good in him, with lots of emotional confrontations and moral debates between the two.
There are indeed some 'batman kills superman fanfic' out there. In some, the writer might be exploring a darker take on the DC universe. It could be due to a breakdown in the relationship between the two heroes, or some external threat that forces Batman's hand. But you have to search through a lot of not - so - great ones to find the gems.