Since I don't have access to the 'harry bribes the troll fanfic', I can only make assumptions. It could be that the troll is blocking Harry's way to something important, like a secret passage or a magical object. Harry, being resourceful, decides to bribe the troll. He might offer it food that trolls like, such as a large amount of meat or some sweet magical treats. This bribe could then change the troll's behavior and set off a chain of events in the story. It could also explore themes like Harry's morality in using bribery to achieve his goals.
Another reason for its popularity is that it gives fanfic writers a chance to be really creative. They can create unique troll characters with their own personalities and senses of humor. And when these trolls interact with Harry, it can lead to all kinds of wacky storylines. Also, it's a break from the more serious and often dark themes in the original Harry Potter series, providing a fun escape for readers.
The title 'harry bribes the troll fanfic' clearly indicates that Harry is a main character. He is the one taking the action of bribing. The troll is another main character as it is the recipient of the bribe. However, in the context of the Harry Potter universe, there could be other characters that play important roles. For example, Hermione might be there to offer advice to Harry about whether bribing the troll is a good idea or not. Ron could also be involved, perhaps he is initially against the idea but later comes around. So, while Harry and the troll are the obvious main characters, there may be others depending on how the fanfic is written.
In the 'harry stops the troll humor fanfic', perhaps Harry represents a force for good in the fan - created universe. The troll humor might have been causing distress or ruining the positive atmosphere of the fanfic's world. By stopping it, Harry is maintaining the integrity and positive nature of the story, making it more enjoyable for the readers who prefer a more positive and less 'troll - ish' environment.
Maybe he uses his charm and influence. If Harry is a popular or respected character in the fanfic, he could simply talk to the ones creating the troll humor and convince them to stop.
I'm not sure who specifically wrote it. There are so many Harry Potter fanfic authors out there. It could be an amateur writer on a fanfic website like Archive of Our Own or FanFiction.net.
It could be about Harry dealing with a troll in a Slytherin - themed fanfic. Maybe it shows how Harry uses his magic skills and courage to face this troll within the context of the Slytherin house setting in the fan - created story.
In this kind of fanfic, it might start with Harry having access to a troll. He could have found it in the Forbidden Forest or some other mysterious place. He then decides to send it to school for various reasons. It could be to teach a bully a lesson. Once the troll arrives at school, there would be pandemonium. Students would be running and screaming. Teachers would be trying to protect the students and subdue the troll. Harry would then be in a moral dilemma, realizing the seriousness of what he has done and trying to fix the situation before anyone gets seriously hurt.