What could be the reasons behind the existence of 'pokemon kill themself fanfiction'?

Definitely not. The whole concept of Pokemon is about friendship, growth, and adventure. Fanfiction should build on these positive aspects rather than creating such dark and inappropriate content. It goes against the spirit of the Pokemon franchise which has always been about positive interactions between the characters and the Pokemon.

The existence of such 'percy weasley abused fanfiction' could also be due to the sheer freedom of the fanfiction realm. There are no strict editorial guidelines like in official publishing. Writers can let their imaginations run wild, and sometimes that results in extreme interpretations. Also, they may be influenced by other dark fanfictions they've read and want to create something similar but with Percy Weasley as the focus, whether it makes sense in the context of the original character or not.

Maybe some people just have very unique and niche interests. They might find some strange fascination in the idea of Pokemon feet for reasons that are hard to understand for the general public.

One reason could be the exploration of dark or taboo themes in literature. Some authors might be interested in delving into the extreme and abnormal aspects of human relationships, including sexual ones, to shock or provoke their readers.

Some people might create it out of a desire to shock others. They want to go against the norm and create a very different, controversial story.

Some people might create such disturbing content due to a lack of proper moral guidance. They may not understand the boundaries of acceptable creativity.

It could be that a very small number of people have a warped view of the characters. Instead of seeing the love and positive aspects of Edward and Bella's relationship, they want to explore a negative and inappropriate side for some strange or deviant reasons. However, this is not in line with the general perception of the story and its characters.

One reason could be a misinterpretation of the characters' struggles. In the original series, the characters face many difficulties, but they always find a way to persevere. However, some fanfiction writers may take those struggles too far and end up with the idea of suicide. Also, there might be a lack of understanding of the impact such content can have on the readers, especially the younger ones.

Some people might be exploring the darker side of human nature through these characters. They want to see how extreme situations can play out between Sasuke and Sakura.

Some people might be exploring extreme or dark themes in the realm of creativity. They want to push the boundaries of what can be written in fanfiction.