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.
" Solitary Throwing Supreme " was a short story that told the story of a lonely supreme being who rose again after being abandoned by a divine object. I recommend this novel to you. I hope you like my recommendation.π
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.
Since I don't know the exact 'lonely king story', but most likely the main character would be the lonely king himself. There could also be some servants or advisers who interact with him in the story.
The 'lonely king story' might revolve around a king who has become isolated due to his power. People might be afraid of him or he might have pushed them away in his pursuit of ruling. For example, he could have made decisions that made his subjects turn away from him, and now he is left with only his title but no real friends or allies. He might be reflecting on his past actions and feeling the weight of his loneliness.
The story of Grunn the Lonely King could be a tragic one. He might be a king who was left all alone in his castle. It could be that his kingdom was facing hardships like war or famine. His advisers might have turned against him, or his family members passed away. He was then left to rule by himself, with no one to truly understand his burdens. He may have tried to make amends or find a way to bring his kingdom back to prosperity, but his loneliness always haunted him.