Some characters might be critical. If they have a strong sense of the 'canon' Superman, they could nitpick at the details in the fanfic that don't match up. For instance, if the fanfic changes Superman's origin story too much, they might frown upon it.
There could also be characters who are indifferent. They may not really care about the fanfic one way or the other. They might just be there, watching passively, without any strong emotions either for or against what they're seeing in the fanfic.
They could be shocked. If the fanfic takes a really unexpected turn, like making a villain into a hero suddenly, the characters might be taken aback. It's like seeing a completely different version of their world.
They could be entertained. Characters like Frozone might find it really interesting to see how fans envision their world and relationships. He might even laugh at some of the more comical interpretations in the fanfic. Fanfics can often bring out new aspects of their personalities in a fun and unexpected way.
Characters could have mixed reactions. If the fanfic is well - written and respectful of the source material, they might be quite positive. But if it's poorly written or changes their characters too much, they could be disappointed or even angry. For example, if a character is known for being brave in the movie but is made cowardly in the fanfic, that character would likely be unhappy about it. And this reaction could vary from character to character depending on their personalities and how much they value their established identities.
They may laugh out loud if there are humorous parts in the fanfic. For instance, if the fanfic writer creates a comical situation involving the characters that is well - written.
There could also be characters who are a bit skeptical. Dolores, with her ability to hear everything, might be able to tell if the fanfiction is based on real events or just pure imagination. If it's too far - fetched, she might be less impressed. However, overall, most characters would probably see it as a form of celebration of their story and be at least somewhat entertained by it.
They could be either impressed or disappointed. The well - written fanfiction that respects the lore and adds new depth to the 40k universe would impress them. But those that are full of inaccuracies or go against the core values of the 40k world might disappoint them. For example, if a fanfiction portrays a noble character as a villain without proper reasoning, the character might be offended. On the other hand, if a fanfiction explores a new aspect of their backstory in an intelligent way, they would be quite impressed.
Some might be entertained. They may enjoy seeing the different scenarios that fans come up with. Like Vaggie, she might be initially skeptical but then get drawn into the creativity of it all.
The villains would have diverse reactions too. Garou might see the fanfic as a source of inspiration for his own 'evil' plans. He might think that some of the ideas in the fanfic could make him an even more formidable foe. However, if the fanfic makes him look like a complete fool, he'd be enraged. Deep Sea King would be confused by the fanfic, not really understanding the concepts that are different from his simple view of the world. But he might also be intrigued by the new versions of himself presented in the fanfic.
Jean might be a bit embarrassed. If the fanfic has some romantic or over - the - top heroic scenes about him, he'd probably blush and try to act like he doesn't care, but secretly he'd be a bit flattered. He's always had an ego, so while part of him would be like 'this is so cheesy', another part would enjoy the attention.
Well, it depends on the specific fanfic. Sometimes the characters could be in awe of the visuals and the story. They might also start imagining themselves in that world and having similar adventures. Or they could be critical and compare it to other similar shows.