One common theme could be exploring a different kind of relationship between Harry and Hagrid. It might involve a deep emotional bond that is taken to a romantic level. Another theme could be the idea of an underdog relationship, as Hagrid is often seen as an outcast in some ways and Harry has his own struggles. However, it should be noted that this is not in line with the original story's intentions.
It depends. While some 'harry potter and hagrid slash fanfiction' might be written in a way that is more innocent and focuses on friendship aspects that are misinterpreted as something else, a lot of it is likely to have adult - themed content. The original Harry Potter books are for a general audience, but slash fanfiction often veers into territory that is not appropriate for kids or those who prefer to stick to the original tone of the story.
In some fanfiction, Hagrid might be the one to finally reveal to Harry all the secrets about his parents that Dumbledore had been holding back. This could lead to a whole new set of adventures for Harry as he tries to come to terms with this new information. Also, there could be stories where Hagrid and Harry team up with some of the other Hogwarts professors to fight a new dark force that is emerging, with Hagrid using his knowledge of magical creatures to their advantage.
One interesting fanfiction could be about Hagrid taking Harry on a secret adventure in the Forbidden Forest before he starts at Hogwarts. They might discover a new magical creature that has been hidden there for centuries.
Then there is 'PotterFanFictionPro'. This author is good at adding new twists to the relationship between Harry and Hagrid. They might write a story where Hagrid accidentally casts a spell on Harry that gives him a temporary ability to understand the language of all magical creatures, and they explore how this new ability affects their relationship and the adventures they go on together.
It's hard to say who the best is, but 'EnchantedQuill789' has some really good Hagrid x Harry Potter fanfiction. Their writing style is very detailed and they do a great job of bringing out the personalities of both Hagrid and Harry. There are also authors like 'WizardlyWords012' who write stories that are full of heart and really explore the relationship between the two in different scenarios.
A really interesting plot could be a time - travel fanfic where Dobby, Hagrid and Harry Potter are sent back in time. They end up in the era when Hogwarts was first built. Dobby has to figure out how to blend in as a house - elf in this different time period, Hagrid is amazed by the primitive but still wonderful magical creatures, and Harry Potter has to deal with the fact that he might change the course of Hogwarts' history. They all work together to make sure that they return to their own time safely while also learning a great deal about the origins of Hogwarts.
It could involve Dobby helping Hagrid in some magical task on Hogwarts grounds. Maybe Dobby uses his unique house - elf magic to assist Hagrid with taking care of the magical creatures. For example, he could magically clean up the dragon's lair in a blink of an eye when Hagrid has trouble doing it the normal way.
The exploration of the wizarding world is also common. Since Hagrid has a deep connection to the wilder parts of the wizarding world, fanfictions may use their relationship to show readers more about the Forbidden Forest, magical creatures, and other aspects of the magical realm that we don't see as much in the original books.
Well, 'Hagrid's Lost Love' is a very touching fanfiction. It tells a story of Hagrid's past love and how it affected his life. The way it describes Hagrid's emotions is really heart - felt. Another one is 'Hagrid's Encounter with the Dark Arts'. This one shows Hagrid facing some dark magic elements and how he overcomes them. And 'Hagrid's Role in the Wizarding War' gives a different perspective on Hagrid's contributions during the war.