It could be Harry Potter. Since the Harry Potter series is extremely popular, there is a vast amount of fanfiction written about the character Harry Potter. So it's very likely that this 'Harry' refers to him.
Well, it's a bit of a subjective matter. While there are a huge number of fanfictions already, new fans are always emerging and they might want to contribute their own stories. However, from a certain perspective, with so many existing ones, it could be argued that there's enough. There are so many different takes on the characters, relationships, and the magical world that it might be saturating the market so to speak.
There are several possible reasons. Maybe he's looking for more originality in his reading material. Fanfic often builds on existing universes, and Harry may be craving something completely new. Another factor could be that he's had negative experiences with certain fanfics, such as encountering offensive or poorly - written ones. After a while, these experiences could lead him to declare that he's had enough of fanfic as a whole.
It could mean that Harry, perhaps a character named Harry, has reached a point where he has had an excessive amount of fan - created fictional works about him. Maybe he's tired of the various interpretations, plotlines, or simply the overabundance of fanfiction that exists regarding him.
Another consequence might be that fans will start to be more self - conscious about their fanfiction writing. They might try to be more respectful of Harry's character and the original story. This could lead to a change in the nature of fanfiction, with more positive and respectful interpretations being written in an attempt to make Harry more comfortable with the whole concept.
Yes, it likely is. The phrase 'enough is enough' usually implies a negative feeling towards something. In this case, it seems to be directed at Harry Potter fanfic, so it probably means the person has some sort of negative view, perhaps they are tired of it or don't like the current state of the fanfic in general.
It could mean that the Harry Potter franchise has been the subject of so much fan fiction that it's perhaps reached a saturation point. There are countless fan - made stories, and maybe it's felt that there's just too much out there now.
Yes, there is a vast amount of Harry Potter fanfiction. The popularity of the series has inspired countless fans to write their own stories, exploring different aspects of the wizarding world, alternative timelines, and new relationships between the characters.