In many Neville Longbottom Deathly Hallows fan fictions, Neville's grandmother Augusta Longbottom could be a significant character. She might give Neville some crucial advice or pass on a family heirloom that is related to the events in the fan fic. Also, Seamus Finnigan and Dean Thomas, Neville's dorm mates, could be main characters as they are with Neville through a lot of the Hogwarts experiences during that time.
Neville himself is obviously a main character. Often, Harry, Ron, and Hermione also play important roles as they are part of the main story in the Deathly Hallows. Luna Lovegood might also be included as she is a friend of Neville's. And of course, the villains like Voldemort and his Death Eaters are usually there to create the conflict.
One interesting fan fiction could be about Neville leading a secret resistance within Hogwarts during the Deathly Hallows time. He uses his knowledge of the castle and plants to outwit the Death Eaters. Another could be a story where Neville discovers a hidden power related to the Deathly Hallows that gives him an edge in the final battle. And there might be a fan fic that focuses on Neville's emotional journey during this dark time, like his internal struggle with fear and his determination to fight for his friends.
Harry Potter is likely to be one of the main characters. He and Neville often interact in the original series, and in the fanfic, their relationship could be further developed. Hermione Granger could also be a main character. Her intelligence and knowledge of magic could play a role in whatever adventures or situations Neville gets into. Ron Weasley might be there too, adding his humor and loyalty to the group.
There's no definitive set of main characters for this without more context. But it could be a young wizard or witch as the main character, perhaps named something like Tom or Lily. There might also be a wise old wizard who acts as a guide and tells the child about the Deathly Hallows.
Harry Potter is the most important. He is the one who has to defeat Voldemort. Ron Weasley and Hermione Granger are also crucial as they help Harry throughout his journey. Voldemort himself is a major character. Albus Dumbledore also has an important influence even though he is dead, through his past actions and the knowledge he left behind.
Obviously, the children of the main characters from the original series could be great main characters. For instance, James Sirius Potter, Albus Severus Potter, or Lily Luna Potter. They would have their own adventures, perhaps trying to live up to the legacies of their parents while also forging their own identities in the wizarding world.
In my opinion, Snape is often a very interesting character in Deathly Hallows fanfiction. His complex past and his true loyalties are always fascinating to explore further. There are many fanfictions that dig deeper into his relationship with Lily and how that influenced his actions throughout the series.
Obviously, Harry Potter is one of the main characters as the title implies he is the one who keeps the Deathly Hallows. Hermione Granger and Ron Weasley are likely to be important as well, as they are Harry's closest friends and would probably be involved in whatever adventures or challenges come with Harry having the Hallows.
Their children could also be important characters. If the fanfiction delves into their family life, the kids would play significant roles. For example, their eldest son might show signs of having inherited Harry's courage and Ginny's feistiness, and they would be part of the story as Harry and Ginny navigate parenting.
Harry Potter is without a doubt one of the most important characters. He is the central figure in the fight against Voldemort. Hermione Granger is also crucial. Her intelligence and knowledge of magic are always helping Harry and Ron out of difficult situations. And Ron Weasley, with his loyalty and sense of humor, is an important part of the trio.
In 'Deathly Hallows' fanfics, you can often find a wide range of characters from the original 'Harry Potter' series being read about. This includes the main trio, Harry, Ron, and Hermione. They are usually central to the fan - created stories, just as they were in the original books. Their relationships and adventures continue to be explored in different and creative ways by fanfic authors.