Well, in such a fanfiction, the plot could be set up in many ways. Perhaps Issei's actions in the crossover world are misinterpreted by Naruto as a threat. Naruto, being a protector of his village and friends, would not hesitate to eliminate a perceived threat. On the other hand, it could also be a dark - themed fanfiction where Naruto is somehow corrupted or forced into killing Issei against his normal moral code.
It could be that in the fanfiction, Naruto is under some sort of mind control when he kills Issei. This would add an interesting layer to the story as Naruto would have to deal with the consequences of his actions once he is free from the control.
In a fanfic where Naruto kills Sirzechs, it could be a very interesting concept. Maybe it's a crossover universe where the power dynamics are completely different. Naruto, with his powerful jutsu, might have a reason like protecting his own world from a perceived threat by Sirzechs. However, it also depends on how the author has set up the story, the rules of the world they've created, and the motives given to Naruto for such a drastic act.
If Naruto kills Rias in a fanfiction, it might be due to a misunderstanding. Naruto is known for his strong sense of justice. Perhaps in this fanfic, Rias is misrepresented as a threat to Naruto's world or his friends. But it's still quite a shock as they are from different fictional universes with their own moral compasses.
In fanfiction, such a plot would be extremely dark and out of character for Naruto. Naruto is typically portrayed as someone who values his friends and comrades, especially Hinata who he has deep emotional connections with. It could be a very edgy take in the fanfic world, perhaps exploring some extreme 'what - if' scenarios or alternate universes where Naruto has been corrupted or misinformed in some way.
This is a really dark concept. In fanfiction, such a scenario might be written to explore extreme emotional distress. Maybe the author wants to show how much pressure Naruto has endured secretly, and on his birthday, which is supposed to be a happy day, it all becomes too much to bear. However, in the original Naruto story, Naruto is a character full of hope and perseverance, so this is a very different take.
This type of fanfiction concept is really out of the ordinary. Naruto's character is built on his values of friendship, loyalty, and his dream of becoming Hokage. Killing Sasuke would mean betraying all of that. However, in a fanfiction, the author might be exploring the 'what - if' scenario. For example, what if Sasuke's actions against Konoha were so heinous that Naruto felt he had no choice? But still, it's a far - fetched and very different view from the original Naruto we know.
In many Issei in the Darkness fanfictions, Issei often undergoes character development. He might face new challenges that are different from the original story. For example, his relationships with other characters can be re - defined. He could form stronger bonds with some characters while having more complex rivalries with others. This makes the fanfiction interesting as it gives a fresh perspective on the character.
In a 'Naruto kills the Sandaime' fanfic, it would be a very dark and alternate take on the Naruto universe. This goes against the traditional bond and respect Naruto has for his village elders. It could be a result of some extreme corruption within the village that Naruto discovers, leading him to take such a drastic step. However, this is a huge deviation from the original storyline.
A fanfiction about Issei marrying Rias could explore the cultural differences within their world. Since Issei is human - turned - supernatural, and Rias is from a noble devil family. Their marriage could be a blend of human and devil traditions. They might incorporate elements like a human - style wedding reception with food and music, along with devilish ceremonies that are unique to Rias' family heritage. This would make their marriage a truly special and one - of - a - kind event in the fanfiction world.
The idea of 'tails kills himself fanfiction' is quite concerning. Fanfiction should be a form of creative expression, but this topic crosses into a very dark territory. It might be inspired by real - world issues of mental health and hopelessness, but it's crucial to handle such topics with care. It could also be a shock - value attempt by the writer, which isn't always the best approach as it can be distressing for readers, especially those who are fans of the character Tails.