Perhaps in this fanfic, Griffith has turned into something truly evil and a threat to the world Guts cares about. Guts, being the warrior he is, might feel it's his duty to put an end to Griffith to save others. Also, Guts could be driven by his own sense of justice. If Griffith has wronged innocent people, Guts may decide that killing him is the only way to set things right.
It depends on the specific fanfic. Some fanfics might have Guts killing Griffith as a major plot point, while others could take a different direction and not have that happen at all.
I'm not sure specifically as there could be many interpretations of such a fanfic. It might involve a scenario where Guts, a character, kills Griffith in a fictional story created by fans. Maybe it's about Guts seeking revenge on Griffith for some past wrongs in the context of the original story's lore.
Friendship is a big theme. Despite their differences, they had a strong bond at one point, and fanfics may develop this aspect more, showing how their friendship could have evolved in different scenarios.
Yes, there are some. You can start by looking on fanfiction websites. Some might be based on different interpretations of their relationship in the original work.
Well, 'A New Path' is also a great 'Griffith x Guts' fanfic. It takes a different approach by imagining a world where certain events in the original story didn't occur. This changes the dynamic between Griffith and Guts completely, and it's really interesting to see how their relationship develops in this alternate universe.
Finding fanfics can be a bit tricky. You could start by searching on popular fanfic websites like Archive of Our Own (AO3) or FanFiction.net. Just type in 'guts kills griffith' in the search bar and see if it comes up.
The appeal lies in the fact that the original story leaves a lot of room for interpretation. Fanfic writers can take these characters and put them in new situations, whether it's exploring their relationship in a more romantic light or in a different world entirely. It gives fans a chance to see their favorite characters in new and exciting ways. For example, some fanfics might focus on how they could overcome their differences and form a stronger bond. Also, the unique personalities of Griffith and Guts, with Griffith's ambition and Guts' more rugged nature, create a lot of potential for interesting storylines in fanfics.