The characters could have a range of reactions. If a character is prideful in the original series, they might be offended if the fanfiction portrays them as weak or incompetent. However, more laid - back characters might just take it in stride and see it as a fun, alternate take on their existence. They may even start to think about their own actions in the series differently after seeing how they are depicted in the fanfiction. Also, characters who are more social might be excited to see how they interact with other characters in these new stories.
Well, some characters might be a bit critical. For example, if the fanfiction takes their personalities in a very different direction than what they are in the original Mob Psycho 100. They could be like, 'That's not really how I would act!' But on the other hand, some might be flattered by the attention and the new storylines created around them. It also depends on the nature of the fanfiction. If it's a heart - warming story, they might enjoy it more than a really dark and twisted version of their story.
They might be shocked. Since fanfiction can often deviate from the original plot, characters could be taken aback by unexpected storylines or characterizations.
They could also be offended. If the fanfiction portrays them in a way that goes against their values or character traits in the original work, they may feel misrepresented. For example, if a character is always shown as noble in the original but is made into a villain in the fanfiction. They might not like this change at all and feel insulted.
They might be amused. Since fanfiction often contains creative and sometimes humorous takes on the original story, characters could find it funny to see how fans imagine different scenarios for them.
They could also be confused. If the fanfiction takes a really wild turn from the original story, characters might not understand the new concepts or relationships presented. For example, if a fanfiction pairs two characters who have no interaction in the original in a romantic way, it could be bewildering for them.
They may also be confused. Fanfictions often take the original story in new directions, and characters might not understand why certain things are written the way they are. For example, if a fanfiction changes the relationship dynamics between characters, they could be left scratching their heads.
They might be amused. Some characters could find the creative interpretations in the fanfiction quite interesting and it might make them laugh or at least bring a smile to their faces.
The Mob Psycho 100 manga was first released in 2012.
One of the highly regarded Mob Psycho 100 fanfiction stories is 'The Unseen Growth'. It delves deep into the character development of Mob outside of what we see in the anime. It shows his internal struggles in a very relatable way.
Others might be critical. For example, if the fanfiction goes against the established canon of the Danny Phantom universe, they could be annoyed or feel that it misrepresents them. They might think that the author didn't do enough research on their personalities or the story's lore.
They may also be indifferent. There could be so much fanfiction out there that they just get used to it and don't really care what's written about them in those fictional works. It could be like just another part of the whole South Park phenomenon that they are part of.