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.
Some might be curious and want to explore more. They could be intrigued by the new storylines and concepts in the fanfic, and might even start to think about how those ideas could fit into their own experiences in the real One Piece story.
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.
Some would be excited. Luffy would probably be eager to jump into the future he sees in the fanfiction. He's always looking forward to adventures, and if the future seems cool, he'd be all for it.
The characters' reactions can be quite diverse. Chopper would be extremely worried and immediately start his medical examination. He'd be constantly checking Luffy's symptoms and trying different remedies. Nami would be worried too but also thinking about how this could affect their journey and the crew's safety. Zoro might seem nonchalant on the outside but would be secretly on high alert, ready to fight off any danger. Sanji would cook up all kinds of nutritious food to help Luffy get better.
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.
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.
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.
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.
Some characters might be very interested and engaged. They could get drawn into the new stories and ideas presented in the fanfiction.
They may laugh. If the fanfiction contains some humorous scenarios or dialogues that are well - written. For instance, if there are some comical interactions between the dragons and the riders that are different from what's in the movie.
Some characters might laugh at the creative and sometimes out - of - the - box ideas in the fanfiction. For example, if there's a fanfic where a dragon can talk in a very strange accent.