In such a fanfiction, one possible scenario could be that Naruto sacrifices himself to save Konoha from an ultimate evil. Maybe a powerful enemy like Kaguya returns in a more menacing form and Naruto, seeing no other way, uses all his power and gives his life to seal the threat away.
Perhaps there's a situation where Naruto's power gets out of control. He tries to hold it back to protect Konoha but it becomes too much for him. As a result, his body starts to deteriorate, and the people of Konoha can only watch in horror as he fades away, with his last thoughts being of the village he loves so much.
Well, he might be really confused at first. Death Battle fanfic often has really out - there match - ups and scenarios that don't exist in his world. He could be intrigued by the different power - level interpretations and the creative battles that the fanfic writers come up with.
In such a fanfiction, one possible scenario could be that Naruto is experimented on for his unique chakra. Maybe Konoha scientists, in a bid to understand the power of the Nine - Tails within him, conduct various tests that are both physically and mentally taxing for Naruto.
One possible scenario is that Anakin might get inspired by the unique battles and combat strategies depicted in the fanfiction. He could start thinking about how he would handle those situations in his own way, given his skills as a Jedi and later as Darth Vader.
In this kind of fanfic, one possible scenario could be that Naruto leaves Konoha due to feeling misunderstood. Maybe he has been wrongly accused of something and decides that he can't stay in a place where people don't trust him.
It can have a significant impact. For some fans, it's a very emotional and dark take. It might make them feel sad and angry, especially those who are very attached to Naruto as a character. They might not like seeing their hero die in such a way.
Perhaps Anakin would find the fanfiction to be an interesting diversion from his own experiences. He might see characters in the Death Battle fanfiction with powers similar to his own and compare their uses of power. For example, if there were a character with a lightsaber - like weapon, he'd analyze how they fought compared to his Jedi training. He could also be intrigued by new and strange powers that don't exist in his world.
One possible scenario could be that Naruto leaves to train in isolation. He might feel that he needs to become stronger on his own without the guidance of Jiraiya, and so he sets off to find new ways to improve his skills.
Perhaps in some fanfiction, Ariel's death could be due to the pollution of the ocean. As she is a mermaid, her home is the sea. If there is excessive pollution, it could make the sea uninhabitable for her and the other sea creatures. She might succumb to the poisoned waters while trying to find a solution to save her home.
One possible scenario could be that she is finally defeated in a great battle by the combined forces of Team RWBY. Maybe Ruby's silver eyes play a crucial role in weakening her, and then Weiss, Blake, and Yang finish her off. Another could be that her own over - ambition and the dark magic she dabbles in backfires on her, causing her to be consumed by it. For example, if she tries to open a portal to a powerful dark realm but loses control and is dragged into it instead of achieving her goal.
Well, Percy might die in a magical accident. Maybe he's trying to harness some extremely powerful and unstable magic, and it backfires on him fatally. He could also be the victim of a curse. A powerful sorcerer or a vengeful god could place a curse on him that slowly kills him. And in some fanfictions, Percy could be killed by a group of enemies who gang up on him when he's in a weakened state, like after a previous battle or when he's separated from his friends and allies.