Harry would likely be overjoyed at first. After all, he never really got to know his parents. Their return could give him a sense of family and belonging that he's always craved. It could also help him deal with some of his past traumas, having his parents there to support him.
Well, it would probably strengthen his relationship with his friends. His friends would be happy for him to have his parents back, and it could lead to more group activities like family - style outings. For instance, they might all go on picnics together with Harry's parents.
The 'return of Merlin' in Harry Potter fanfiction could be a really exciting plot. It might be that Merlin has been trapped or in some sort of stasis for a long time. His return would stir things up. He could be the key to solving some of the most difficult problems in the wizarding world, like the mystery behind certain dark artifacts or the origin of some powerful curses. He could also form alliances with the existing characters, creating new and interesting relationships.
Well, it depends on what you're looking for in a 'Harry Potter Return of the King' fanfiction. If you like stories with a lot of action and adventure, there are likely some that fit the bill. For example, there could be fanfics where Harry has to go on a long and dangerous journey, much like Frodo in 'The Lord of the Rings: Return of the King', to save the wizarding world from a powerful dark force. You can also find some that focus more on the political aspects of the wizarding world, similar to the power struggles in Middle - earth in the 'Return of the King'.
Fanfics contribute by filling in the gaps. For instance, between the books, there are time periods that J.K. Rowling didn't fully explore. Fanfics can create stories during those times. They also expand on minor characters. Some fanfics focus on characters like Dobby or Kreacher, giving them more backstories and personalities, which in turn adds to the overall richness of the fandom's continuity.
Harry's view of the world might change completely. He has seen so much darkness and death. With his parents' return, he could start to see the world in a more hopeful light. He may be more willing to forgive those who have wronged him in the past, like Snape. Their return would be a catalyst for a huge shift in his personality, making him more balanced and less haunted by his past traumas.
Well, it could be about the founders coming back to Hogwarts to fix some long - standing issues. Maybe they return to deal with the dark magic that has seeped into the school over the centuries.
Harry Potter might still be the main character even with Merlin's return. Merlin could be more of a guiding or helping figure, and Harry would be the one who ultimately has to face the main challenges with Merlin's assistance. So Harry would remain at the core of the story.
There could also be new characters introduced in the fanfic. Maybe a young, talented wizard or witch who is just starting at Hogwarts and becomes involved in Harry's return journey. They could bring a fresh perspective and new abilities to the story. And of course, Dumbledore, even if he's not physically present all the time, his influence and legacy are likely to play a role, so he can be considered one of the important characters in a sense.
It could mean that in the fanfiction, there's a concept of the dead returning in a more metaphorical sense. Maybe the memories or the influence of dead characters return to haunt or guide the living ones. For example, the ghosts of Harry's parents could play a more active role in the story than they do in the original books, coming back in a way that affects Harry's decisions and the overall plot.