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.
A unique take on their relationship. For example, if it shows a side of their bond that was not explored much in the original manga, like Casca's perspective on Guts' more reckless actions. It could also stand out with great character development, making them more complex and relatable.
One great example could be a fanfic that focuses on Guts and Casca's relationship before the Eclipse. It might explore their shared moments of trust and growing affection. Another could be a post - Eclipse fanfic where Guts is trying to help Casca regain her sanity. There are also fanfics that put them in alternate universes, like a modern - day setting where they have to face different kinds of challenges while still having their core relationship dynamics.
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.
Yes, there are many Berserk fanfictions that focus on the complex non - romantic aspects of Guts and Griffith's relationship. For example, some may explore their friendship before the betrayal, their rivalry on the battlefield, or their mutual respect for each other's skills. These fanfictions can provide a deeper understanding of their characters and the overall story of Berserk.
In some fanfictions, their relationship can be seen as a source of inspiration. Griffith's grand vision might inspire Guts to strive for something greater than just survival. At the same time, Guts' unwavering determination can be an inspiration for Griffith to keep pushing forward in his own goals, all without any romantic or sexual elements.
I'm not entirely sure as 'child casca gut' seems rather unclear. It could potentially be a very specific or misnamed fanfic. It might be related to a character named Casca in some fictional universe, but without more context, it's hard to say exactly what it's about.
I'm not sure where you can find it. It's not a common or well - known type of fanfic, so it may not be on mainstream fanfic platforms. You could try searching in more niche or specialized fanfic communities related to the possible source material of 'Casca'.