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.
There's also 'Female Guts: The Lost Chapters'. This fanfic delves deep into Guts' backstory, adding a female perspective. It gives her more emotional depth and shows how she overcomes various challenges. The author does a great job of maintaining the dark and gritty feel of the original 'Berserk' series.
A good 'Berserk' female Guts fanfic should first of all stay true to the essence of the original character. Guts is known for her tenacity and her complex personality. So, the fanfic should capture that. For example, if it shows her facing demons, it should show her unwavering will to fight, just like in the original work.
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.
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.
A villain like Shigaraki would likely be interested in the power levels in the MCU fanfiction. He's always looking for ways to increase his own power, and seeing the various powerful artifacts and abilities in the MCU might give him some ideas. He could think about how he could use similar things in his own plans to take over the MHA world.
Some MHA characters might be flattered. For example, Midoriya would probably be really excited and take it as a sign of how much he's inspired people. He might even look for positive lessons in the fanfiction to improve himself.
If the MHA characters were to react to a Mastermind fanfiction, some would be more accepting than others. Characters like Ochaco might find it really exciting. She's a fan of the heroes herself, so seeing different takes in fanfiction would be like getting a new perspective on the MHA world. However, characters like Shoto, who are more reserved, might be a bit hesitant. He might need some time to process what he's reading. But overall, it would be a very interesting scenario as it would show how the characters view different interpretations of their world.
Some characters would be shocked. For example, if the fanfiction had a really dark and unexpected Mastermind plot, like a hero turning out to be the mastermind of all the villains' plans, characters like Tsuyu would be very taken aback. She'd probably question the motives behind such a plot. Then there are characters like Denki. He might be more into it if it had some cool action scenes in the fanfiction, regardless of how out - of - the - blue the Mastermind storyline was. And Nejire would probably be super curious about the emotional depth of the characters in the fanfiction.