Well, there are also those characters who might be a bit shocked or confused. Take Levi from Attack on Titan. He's a very serious and no - nonsense type of character. If he were to read some of the fanfic about him that deviated too much from his own self - perception, like being made into a comical or overly emotional character in the fanfic, he might be taken aback at first. But then he might also realize it's just a different interpretation and not take it too seriously.
In general, the JJK anime remains loyal to the manga. It effectively captures the key elements and maintains the story's momentum. Some scenes might be presented differently for better animation effects, but these changes are not substantial and don't deviate from the manga's core.
Well, it's kind of hard to give an exact measure. But the anime has made good progress and has adapted quite a few story arcs from the manga. There are still many exciting parts in the manga that haven't been animated.
Well, it's a bit tricky to say exactly. The anime has made decent progress, but it's not caught up completely. Some key storylines and developments from the manga are yet to be shown in the anime.
Well, it depends on the nature of the fanfiction. Some anime characters might be amused if the fanfiction is light - hearted and full of comical situations. For example, if it's a fanfic about a cooking competition among the characters from a shonen anime, they might react with good - natured laughter and competitiveness. They could also be confused if the fanfiction takes their story in a very strange or unexpected direction, like suddenly making a character from a historical anime end up in a space adventure.
The JJK anime ends at a specific point in the manga that varies depending on the pacing and adaptation decisions. You'll have to look closely to determine exactly where.