It doesn't seem to be a widespread or commonly - used statement in the general 'DanMachi' fandom. Most of the time, the fandom is focused on either the official story, fanart, or positive aspects of fanfiction. However, in some niche discussions where fans are very critical of how the official story affects the fan - created content, such a statement could potentially come up. But overall, it's not something you'd hear every day among 'DanMachi' fans.
In the 'DanMachi' fandom, I haven't really noticed this being a common statement. The fandom is quite diverse, with different groups focusing on different aspects like shipping characters, analyzing the plot, or creating their own fanfiction. While there may be some impact of the official Bell Cranel story on fanfiction, it's not something that has led to a general, widespread statement like 'bell cranel killed fanfiction'. There are still plenty of fans creating and enjoying fanfiction related to the series, regardless of what Bell Cranel does in the official story.
A really interesting fanfiction idea could be Bell Cranel having to prove himself worthy of his Zeus - related lineage. This could involve him going through a series of trials that test not only his physical strength but also his moral character, all while dealing with the regular challenges in the Danmachi world.
Perhaps in the story, Bell Cranel had an arc or a relationship development that was so impactful that it left little room for the kind of creative interpretations that fanfiction often thrives on. Fanfiction usually takes the existing characters and settings and explores different scenarios, but if Bell Cranel's story in the official work is too complete or all - encompassing, it might discourage the creation of new fanfiction.
One unique plotline could be Bell Cranel using powers that are latent within him due to his Zeus heritage in unexpected ways. For instance, he might be able to communicate with a special type of monster that has a connection to Zeus's past.
Love is also a common theme. There are many fanfictions that explore Bell's romantic relationships, whether it's with Ais or other characters. Adventure is another prevalent theme. Bell is known for his adventures in the original story, and fanfictions often take him on new and exciting adventures, sometimes to unexplored parts of the world.
It could be a character from a rival group. They see Bell Cranel as a threat to their plans and so they betray him by setting him up in a dangerous situation.
One common theme is adventure. Since they are both characters from a world full of dungeons and monsters, many fanfictions focus on their exciting adventures. For example, exploring new levels of dungeons or fighting powerful foes.
Romance is also a popular theme. Many fanfictions focus on his relationships with different characters, like his feelings for Ais Wallenstein. This adds an interesting emotional depth to the stories.
Friendship is also a prevalent theme. His strength can either strengthen or strain his friendships. In some fanfictions, his friends might be jealous of his rapid growth in strength, while in others, they support him wholeheartedly and their friendships are deepened because of his journey to become strong.
It concludes with Bell Cranel achieving a significant level of growth both as an adventurer and as a person. He overcomes many of his initial insecurities and becomes a more confident and capable hero in the world of Orario.
One common theme is empowerment. Since Bell is female in these fictions, the stories often focus on her rising above challenges and becoming stronger. Another theme is friendship, showing how she forms deep bonds with other characters in the 'danmachi' world.