If Batman finds out that the Slade fanfiction was having an impact on the minds of young people, for example, making them idolize a villain - like character, he would take it more seriously. He might try to work with the creators of the fanfiction platforms to ensure that there were some sort of guidelines or warnings attached to such stories, to make sure that the younger audience understood the difference between right and wrong, and that Slade was not a character to be emulated.
Batman may be slightly annoyed. He's a very private and serious person. The idea of people writing fictional stories about a character like Slade, especially if they were inaccurate or glorifying Slade in some way, could irk him. He might think it was a waste of people's time when they could be focusing on more important real - world issues.
She could be confused at first. Fanfiction can be quite different from the actual story, and Abby might need some time to understand the concept if she's not familiar with it.
Some fanfictions show Slade taunting Nightwing about his relationship with Batman. This can create tension between Nightwing and Batman as Nightwing might feel the need to prove his independence. Batman, in turn, may be overly protective, which Slade can use to his advantage. The interactions can also lead to unexpected alliances. For instance, in some stories, Slade and Nightwing might have to work together briefly against a common enemy, much to Batman's dismay.
He may feel a bit weird. Fanfiction can be so different from his real self. He might not like some of the wild ideas people have about him.
If Naruto was adopted by Slade Wilson in fanfiction, his powers would take on a new dimension. Slade could introduce Naruto to a different way of thinking about his powers. Instead of using his chakra mainly for big, flashy attacks, he could be taught to use it more subtly. His Nine - Tails chakra, for instance, could be harnessed in a more controlled way for stealth and infiltration. Naruto might also learn how to use his powers to intimidate opponents rather than just overpower them. His power growth would not just be about getting stronger in the traditional sense, but also about becoming a more strategic and unpredictable user of his abilities.
Naruto could find some similarities between his own values and Batman's. Both are determined to protect their respective worlds. However, the storytelling style in Batman fanfiction might be a new concept for Naruto. He may enjoy the complex characters and the dark, gritty atmosphere often found in Batman stories, or he could be put off by it as it's so different from the more straightforward good - vs - evil in his own world.
He would probably be frustrated. Batman relies on his human abilities and technology, not powers. He might try to quickly correct their misunderstanding.
Alphys would likely be very confused at first. She's used to her own types of fan - related interests, and this would be something new and strange. She might think it was some sort of strange new trend in the Undertale fandom that she didn't know about. As she thought more about it, she could become more accepting, especially if she realized it was just a creative expression of the fans. But it would definitely take her some time to get used to the idea.
I think Spiderman would have an edge in a fight against Batman. His powers are more innate. He can swing from building to building effortlessly and has a much stronger physical strength compared to Batman. Batman is just a human, albeit a very well - trained one. In the fanfiction world, though, the story could be twisted to make Batman's gadgets and strategic mind overpower Spiderman. But overall, Spiderman's natural abilities give him an upper hand.
Snape might be initially shocked but then try to hide his concern. He's a complex character. He could act indifferent in public but secretly start to gather information about who is behind the abuse. He might also start to keep a closer eye on Harry without the boy realizing it.
If Harry Potter discovers the Tessaiga in fanfiction, his character could develop in many ways. He'd have to adapt to a different kind of power. This would require him to be more open - minded. He might start to question the traditional magic of his world more. Also, having such a powerful weapon could make him more confident, but also more cautious as he realizes the great responsibility that comes with it. His relationships with his friends might change too. For example, Ron might be a bit jealous at first, while Hermione would be eager to study the Tessaiga. Overall, his character would grow in complexity as he incorporates this new element into his life.