On Fanfiction.net, you can sort the search results by reviews or favorites. Writers whose works consistently get a high number of reviews and are favorited a lot are probably worth following. They might be the ones creating interesting crossovers between MHA and God of War. But it does take some time to sift through the different works and find these writers.
You can try websites like Archive of Our Own (AO3). It has a large collection of fanfiction for various fandoms, including those related to My Hero Academia (MHA) and God of War. Just use their search function to look for crossovers or relevant works.
Well, some Olympians might be offended. In God of War, the portrayals of the gods are often rather violent and not in line with their traditional, more glorified images. For example, Zeus is shown as a rather tyrannical figure in the game, and in fanfiction that might be even more exaggerated. So they might not be too happy about it.
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.
The Sky-Breaking God of War and the Jedi God of War were two characters in the anime," They represented the power of loyalty and the pursuit of strength. The Heaven Shattering Battle God and the Earth Destroying Battle God were good friends, and their strengths were equal. In the storyline, they joined forces to fight against the three dark bodies and the God of Destruction, displaying their powerful combat ability. In the 43rd episode, the God of War was upgraded to the Super God of War, and together with the Super God of War, they destroyed the God of War. As for their ultimate moves, there were Extreme Frost, Frozen Ten Miles, and Super Extreme Divine Sword. Other than the characters in the anime, there were also novels and videos related to the Heaven-Shattering God of War and the Jedi God of War.
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.
If it's a Disney fanfiction based on a princess story, the female characters in MHA like Momo Yaoyorozu might relate to the princesses' grace and leadership. Meanwhile, the male characters could either be in awe or a bit dismissive, depending on their personalities. For example, Todoroki might be quietly respectful, while Mineta might make some inappropriate remarks (if we're being honest about his character).
MHA characters might also be a bit jealous of some of the superpowers or unique abilities in other anime fanfiction. In their world, quirks are relatively well - defined, but in some other anime, there are really out - of - this - world powers. They could be in awe of the creativity and at the same time, try to figure out how they could incorporate some of those ideas into their own fighting styles. Like, if they read a fanfiction about a character who can manipulate time, they might start thinking about how they could use their quirks in a time - related way.