No. In the Harry Potter fandom, fanfiction is quite popular. There are many fans who enjoy creating and reading fanfictions. So, the idea of Harry Potter 'saying no' to it is not a common statement at all.
Watching the movie adaptations can also be a substitute. The movies bring the magical world of Harry Potter to life in a different medium. You can see the spells being cast, the Hogwarts castle in all its glory, and the beloved characters come to life on the screen.
I don't have enough information to say exactly who Cap'n Kathy is. She could be an original character created by the fan fiction writer. Maybe she's a pirate - the 'cap'n' part could suggest that - who has some connection to the wizarding world of Harry Potter.
One possible plotline could be that Harry and his friends discover EXO's music and are magically transported to one of their concerts. Another could be that Voldemort is trying to use EXO's popularity to gain more followers in the wizarding world.
Maybe it's a former Death Eater who has seen the error of his ways. He wants to atone for his past sins by training Harry to defeat Voldemort. He has inside knowledge of the dark side's tactics and uses this to make Harry a more formidable opponent.
In this 'Harry Potter Trained by N Fanfiction', perhaps Harry is trained in the art of magical combat in a more intense way. He might be sent to a secret location where he has to endure rigorous training. This training could involve facing powerful magical creatures, which helps him build his confidence and magical strength.
It could mean that within the context of the Harry Potter world, there is an idea or statement where Harry Potter, as a character, is opposed to fanfiction. Maybe it implies that the official or 'true' story as per the original works doesn't want to be overshadowed or misrepresented by fan - created stories.
As far as I know, there isn't a single, all - encompassing official statement that says 'Harry Potter saying no fanfiction' in those exact words. However, the rights holders have been cautious about fanfiction due to various reasons like protecting the brand and intellectual property.
Well, 'Harry Potter saying no fanfiction' might imply that J.K. Rowling or the rights holders of the Harry Potter series don't want fan - made stories. Fanfiction often takes the original characters and settings and creates new scenarios. They might be worried about it diluting the brand or going against their vision for the story. For example, some fanfictions might change the personalities of the characters in ways that the original creators don't like.
It would be very negative. Fans of 'Harry Potter' are passionate about the series for its positive themes. Such a statement would be offensive to them as it goes against the essence of the story they love. It could create division within the community, with some fans being outraged and others perhaps confused by such a baseless claim.