In some 'armin death fanfic', he could be killed by a traitor within his own group. This would create a lot of drama and conflict, as his friends have to not only deal with his death but also hunt down the traitor. It could also lead to a lot of soul - searching among the group members about trust and loyalty.
I'm not sure about specific popular 'Armin Arlert death fanfic' stories as it can be a rather niche area. However, some might be found on fanfic platforms like Archive of Our Own. You could try searching there using relevant tags.
First, understand Armin's character well. Know his strengths, weaknesses, dreams, and fears. Then, create a believable scenario for his death. It could be related to the overall plot of the original story or something new. For example, if the original story has a lot of battles, his death could be a result of a strategic sacrifice in a crucial fight.
People write 'Armin Arlert death fanfic' for various reasons. It could be a form of expressing their own interpretation of the 'Attack on Titan' story. They might feel that in a certain scenario, Armin's death is a logical outcome. Another reason could be to explore the psychological impact on the other characters if he were to die. Writers may also be interested in subverting the expectations of the original story. Since Armin is an important character, his death can change the entire dynamic of the story and open up new avenues for storytelling. Some writers might also use it as a way to deal with their own feelings about the character, either loving him so much that they want to explore a tragic end for him or having a different view of his role in the story.
It's fairly common. Fans often look for more content related to their favorite shows. Since 'Attack on Titan' has a large and passionate fan base, there are a lot of fanfics available. 'Aot' fans might watch (read) these fanfics to explore different scenarios that the official story didn't cover. For example, they might want to see how a certain character would react in a different situation or what would happen if a major plot event had a different outcome.
There could be various fanfictions. Maybe some that focus on alternative endings, like ones where certain characters survive who didn't in the original. For example, a fanfiction where Erwin survives and leads the Scouts in a different way.
It could mean that a person who is a fan of 'Attack on Titan' (AOT) is reading or watching fan - created fictional works related to AOT. Maybe they are interested in seeing different interpretations or storylines that fans have come up with.
One way is to check on popular fanfiction websites. Look for ones with high ratings and a lot of reviews. For example, Archive of Our Own (AO3) has a large collection of AOT fanfictions. You can search for the most popular ones there.