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.
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.
In this fanfic, Harry Potter is the protagonist. He is the one with the idea of giving the troll a job. The troll is the main character as well, as the story focuses on its new life with a job. Additionally, Dumbledore might be involved. He could be either supporting Harry's decision or warning him about the potential risks of having a troll in a certain role at Hogwarts.
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.
A powerful dark wizard who has infiltrated the Troll Market and is using it as a base to gather dark magic items. He could be after the Elder Wand or some other powerful artifact from the Harry Potter universe and is using the chaos and secrecy of the Troll Market to his advantage. He would see Harry Potter as a threat to his plans and try to eliminate him.
Well, aside from Naruto and the troll emperor, I think Sasuke could also make an appearance. He might show up to either support Naruto or to be annoyed by the whole situation. And there could be a cameo from Jiraiya. He might be there to add some wisdom to the crazy interview scenario, maybe trying to give Naruto some advice on how to handle the troll emperor. Also, the interview might be held in a place where other minor characters from the Naruto world are around, and their reactions could be part of the story too.
Harry Potter himself is often a main character. Since it's related to Hogwarts, he would be the one to step up and deal with the troll situation. Hermione would also be there, using her vast knowledge of magic to come up with a plan. Ron would be by their side, providing some comical relief as well as his own brand of bravery.
There could be a brave troll warrior as a main character, who is known for his great strength and combat skills. Maybe there is also a wise old troll who serves as an advisor, guiding the younger trolls through the chaos of the war. And there might be a female troll character who is not only strong in battle but also has some special abilities, like being able to communicate with animals or having some sort of healing power that helps the wounded trolls in the war.
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.
It could be the person or group who sent the troll. Maybe there's a mastermind behind the troll's actions, like a villain who wants to distract Bucky from something important. So while the troll is the immediate target of Bucky's punch, the real enemy is the one pulling the strings.
The main characters are usually the troll and the traveler who wants to cross the bridge.