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.
Often, themes like mutual understanding and acceptance are present. Since 'lemon' usually implies a more mature or romantic side, the fanfictions might also explore themes of passion and the growth of the emotional bond between Shinkami. There could also be themes related to overcoming challenges together as a couple, which adds depth to their relationship in the story.
One popular theme is friendship exploration. In many shinkami fanfics, they might start as classmates or heroes in training and gradually develop a deep bond. Another theme could be adventure, where they team up to face a powerful villain. Also, some fanfics focus on their individual growth and how they inspire each other during that process.
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.
DeviantArt can also be a source. While it's mainly known for art, there are some writers who post their fanfics there as well. You can search for shinkami fanfic specifically and might be surprised at what you find. Just make sure to check the ratings and descriptions to ensure it's what you're looking for.
One possible aspect to analyze in 'shinsou x denki fanfiction' could be the relationship dynamic between the two characters. Shinsou is often depicted as more reserved and Denki as more outgoing. Their interactions in the fanfiction might explore how they complement each other. For example, Denki's energy could bring out a different side of Shinsou, and Shinsou's calmness could ground Denki. It could also delve into their shared experiences at school or during hero training, and how these experiences strengthen their bond.