Neville Longbottom could be an interesting main character in a wards fanfiction. After all, he has grown into a powerful wizard. He could be in charge of teaching the new students about the wards or be the one to discover a new aspect of the wards. Luna Lovegood could also be a main character, with her unique perspective on magic, she might be able to see things about the wards that others miss.
Harry Potter himself could be a main character, as he has a deep connection to Hogwarts and would surely be involved if the wards were in trouble. Hermione would also be a great choice, with her vast knowledge of magic, she could be crucial in understanding and repairing the wards. Ron could be there for support and his own brand of bravery.
You could have a new generation of students as the main characters. For instance, a young Gryffindor with a curious mind and a natural talent for magic wards. Or perhaps a Slytherin who has a hidden agenda regarding the wards but ends up being on the side of good. There could also be a Hufflepuff who has a special connection to the earth magic that might be related to the wards.
Obviously, Harry Potter himself could be a main character. He has so much experience with the school and its magic. He could be the one to discover a new aspect of the school wards and lead the effort to protect or repair them.
Harry Potter himself is often a main character. Since the blood wards are related to his protection at Hogwarts, his actions and experiences are central. Hermione Granger might also be a key character as she is always involved in solving magical mysteries and could be trying to understand the blood wards better. Ron Weasley too could be there, as he is Harry's best friend and often gets involved in any Hogwarts - related adventures.
Obviously, Harry is one of the main characters. And the wards he is raising would also be main characters. But without reading it, we can't be sure who these wards are specifically.
Well, he might discover some hidden secrets while cleaning. Maybe he stumbles upon a long - forgotten spell or a mysterious object that has been lost for ages.
Neville Longbottom could be a main character. He has always had the potential for great things and in a world without Harry, he would be likely to step into the spotlight. He has the courage and the connection to Hogwarts that could make him a central figure in the fight against evil.
Hermione could also play a role. Given her intelligence and love for learning, she might take an interest in accounting to better manage the finances of the various causes she's involved in, like the Society for the Promotion of Elfish Welfare. So she could be a main character or at least a supporting one in this fanfiction.
Obviously, Harry Potter himself could be a main character. He could be the one who is initially reluctant to participate in a dance event but then discovers a new passion for it. Hermione could also be a main character as she might be the one researching the history and significance of different wizarding dances.
In addition to the main trio from the Harry Potter series, there could be some of the Hogwarts professors as main characters. For example, Professor Dumbledore might have some knowledge about the balverines that he imparts to Harry. And Hagrid, with his love for all kinds of strange creatures, could be involved in trying to tame or at least understand the balverines better.
Harry, Hermione and Ron could be the main characters, exploring the mysteries of the mansion. Or perhaps a new generation of wizards, like the children of the original trio. Neville Longbottom could also be a main character, using his knowledge of plants to uncover secrets in the mansion's garden.
Even Neville Longbottom's descendants could be interesting main characters. Maybe his grandson has a unique talent for herbology, like Neville did. He could use his skills to uncover a plot that involves poisoned plants in the Hogwarts gardens and throughout the wizarding world, and along the way, he becomes a hero in his own right.