Some characters might be quite amused. For example, Hermione would probably analyze the fanfiction from a logical perspective, critiquing the plotlines that involve ships. Ron, on the other hand, might be a bit bewildered at first but then find it rather entertaining. Harry himself could be either indifferent or intrigued, depending on how the ships are portrayed. If it's a ship that he has a personal connection to, like his parents, he might be more interested in seeing how the author has envisioned their relationship in the fanfiction world.
Some characters might be very intrigued. For example, Albedo, with his scientific mind, would likely analyze the concepts in the fanfiction related to Earth. He'd be interested in how Earth is depicted, its cultures, and technologies. He might even try to find similarities with Teyvat in terms of elemental powers or social structures.
Well, the characters in Genshin Impact might be quite surprised at first. They come from different universes. For example, the art styles are different. Genshin Impact has a more fantastical, open - world kind of style, while Honkai Impact has its own unique and often more action - packed feel. If they were to react to the fanfiction, some might be amused, like Paimon. She would probably find the crossovers in the fanfiction really interesting and keep asking questions about the Honkai Impact characters. And Diluc might be a bit more reserved, but still intrigued to see how the two universes are combined in the fanfiction.
Some characters would be fascinated. For example, Fischl would likely see it as a grand adventure from another realm. She might even incorporate some of the elements from the Honkai Impact fanfiction into her own delusions. Keqing, on the other hand, would probably approach it more analytically. She would try to understand the logic behind the Honkai Impact world and how it differs from Genshin Impact. She might make notes about the different power - leveling systems and how the characters interact in the fanfiction.
The students of Class 1 - A would have a range of reactions. Ochaco might find the romantic elements in the fanfiction really sweet, especially if there are any cute ship moments. Iida would likely be concerned about whether the fanfiction adheres to some sort of moral code. He might be nitpicky about things like fairness and justice within the fictional story.
I'm not entirely sure who all the main characters are, but I know there must be a ship's captain who leads the voyages. He would be a central figure in the story.
Shigaraki would likely be dismissive. He's so focused on his own goals of destroying the hero society that he'd see fanfiction as a useless distraction. However, if there were elements in the Genshin Impact fanfic that could somehow be related to his own plans, like powerful artifacts or magic that could be used for destruction, he might take a second look.
The Traveler is extremely important. They are the main protagonist, on a quest to find their sibling. Then there's Paimon, the Traveler's sidekick, who provides comic relief and also helps in explaining things to the player. Zhongli is also crucial. As the former Geo Archon, his knowledge of Teyvat's history and his influence on Liyue's development are significant parts of the story.
For the teachers in My Hero Academia, like Aizawa, he would probably be indifferent to most ships fanfiction. But if there were ships that involved his students in inappropriate or unethical ways in the fanfiction, he would be very concerned. Otherwise, he would just see it as another strange aspect of the fans' creativity and leave it at that.
Harry Potter might be a bit surprised. He'd probably think it's strange that people are writing about his friends' and his own relationships in such a different way. Hermione would likely be very interested in the writing style and how the authors are creating these new relationships. She might even take notes to improve her own writing. Ron would just laugh it off most of the time. He'd find it a bit odd but also funny.