Well, it could mean that in the context of Percy Jackson, something about Percy Jackson's character or actions in a fan - created story (fanfic) disrupts or spoils what was otherwise a really good or well - structured fanfic. Maybe his actions go against the flow or theme the fanfic author had in mind.
The phrase contains inappropriate and vulgar language. If we assume 'Harry' is a character name, it seems to be about a situation where this Harry is involved in some sort of destruction related to a fan - created fictional work, but the use of 'tight cunt' is unacceptable in proper language.
Definitely not. A normal fan - created concept for Naruto would revolve around his adventures, his battles against villains, or his development as a character. This phrase contains offensive and inappropriate language which has no place in the world of proper fan - creations. It's a deviation from what is considered appropriate and positive in the Naruto fan community.
No. Given the rather odd and not - so - common naming, it's highly unlikely to be a popular fanfic. Popular fanfics usually have more accessible and mainstream - friendly names.
Using such a title violates the norms of good taste and respect in the fan community. Fanfic is meant to be a form of creative expression that is inclusive and family - friendly, not containing such offensive elements.
It's a rather odd statement. 'Harry' here might refer to a character named Harry in a particular fandom. 'Ruins' implies that he somehow spoils or negatively impacts a 'fanfic' (fan fiction). However, 'tight ass' is an inappropriate and unclear part in this context. It could be a very unorthodox or poorly worded description within the fan - created story.
Since we don't have much information about this 'percy destroys tiny cunt fanfic', it could be a really out - there idea from a small group of fans. It might be inspired by a book, movie, or game where Percy is a character. The 'destroys' part implies some sort of action or plot point, and 'tiny cunt' could be a very strange or specific object, place, or idea within the fanfic world. Maybe it's a play on words or has some deep - seated meaning within the fan community that created it.