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.
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.
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.
We could rewrite it as 'Harry ruins a certain fan - created story'. This way, we remove the vulgar and inappropriate language and focus on the more general idea of Harry having a negative impact on a fanfic.
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.
If we consider 'Percy challenges a significant fanfic', it means that Percy is doing something that questions or contests the elements of a fan - made story that holds significance. He could be challenging the values represented in the fanfic, or he could be opposing the main ideas or the way the story is progressing. This shows that Percy is having an impact on the fanfic that is more than just a minor interference.