Obviously, Harry Potter himself is the central character. Since it's about his unexpected lordship, he is the one going through all the changes and challenges. Hermione Granger is also often involved. She helps Harry understand the implications of his new status, whether it's researching about the history of the lordship or using her intelligence to solve problems related to it. Ron Weasley is there too, providing his usual loyal support and comic relief.
Harry Potter is often a main character. Since he's the central figure in the original series, it's natural for him to be involved in fanfiction about lordships. Hermione Granger might also be there as she is Harry's closest friend and often gets involved in important matters. Ron Weasley could be another, as he's part of the trio.
Obviously, Harry Potter himself. Hermione would probably be by his side, helping him research about his claim to lordship, using her vast knowledge from the library. Ron might also be there, providing moral support and his unique sense of humor in difficult situations.
Harry Potter is often the central character. Since he is the main protagonist in the original series, many fanfictions build on his story by giving him a lordship. Hermione Granger is also popular as she can be involved in helping Harry understand the implications of the lordship, whether it's about magic lore or dealing with political aspects.
Perhaps there are dark wizards who don't want Harry to gain more power through this lordship. They might fear that he'll use it to oppose them more effectively. So they would plot to stop him from fully taking on his new role.
Harry Potter himself is often involved. He might be the one to encounter the first signs of inflation, whether it's a magically inflating potion or an enchanted object. His friends, like Ron and Hermione, are also likely to be part of the story, helping him figure out what's going on.
Ron Weasley could also be a key figure. He might be Harry's loyal friend as always, standing by his side during all the changes that Harry is bringing about in the wizarding world as a god. And there could be new characters introduced as well, perhaps other gods or magical beings that interact with Harry in this new fanfiction realm.
In some cases, Albus Dumbledore could play an important role. His wisdom and power in the wizarding world would make him a key figure in any situation where the two different universes collide. He might be the one to first discover Alexstrasza's presence and figure out how to make use of her abilities in the fight against the dark forces in the Harry Potter world.
Obviously, Harry Potter himself is always a main character. He is the one most directly associated with the concept of death in the original series, what with his parents' death and his multiple near - death experiences.
Ron Weasley could be another main character. He might be initially skeptical about the piano's magic but then be amazed when he sees the extraordinary things it can do. Maybe he accidentally discovers a new function of the piano while fooling around with it in the Gryffindor common room.
Harry Potter himself could be one of the main characters in such fanfiction. Maybe he gets an automail limb after a particularly dangerous encounter with Voldemort. Hermione might also be involved, using her vast knowledge to help understand and improve the automail technology within the wizarding context.