One new character could be a half - giant half - wizard. He's big and strong like Hagrid but also has a special connection to the magical elements in the air. He could be a bit clumsy at first but has a heart of gold. Also, a mysterious girl who can communicate with magical creatures through telepathy. She comes to Hogwarts to study more about the different species and ends up befriending Harry and his friends. She has a secret past that is slowly revealed throughout the fanfiction.
A new character could be a young wizard from a far - off land who has a unique style of magic. Maybe he's from a place where they use music to cast spells, and he brings this new form of magic to Hogwarts. Another could be a Muggle - born witch who has an extraordinary talent for herbology, much like Neville, and she challenges the pure - blood students' views on Muggle - borns.
One new character could be a half - giant half - wizard. He's often been an outcast in both the giant and wizard communities. When he comes to Hogwarts, he has to deal with the prejudices of the students and teachers alike. But he also has great strength and a unique perspective on magic. There could also be a character who is a descendant of a former Hogwarts headmaster or headmistress. This character could bring a sense of legacy and new secrets about the school's past.
There could be a new professor at Hogwarts. Maybe a young and brilliant wizard who has just returned from a long journey in a far - away magical land. This professor could bring in new ideas and spells, and become an important figure in Harry's new path.
One potential new character could be an old hermit - like wizard who has been living in the woods near the manor. He has a deep connection with the land on which the manor stands and can communicate with the spirits of the forest. He could be a source of ancient wisdom for the main characters. Also, a young and adventurous witch who is on a quest to find a lost magical gem that is rumored to be hidden somewhere in the manor. She could bring a new dynamic to the group with her fearless and independent nature. There could also be a magical gardener who takes care of the manor's enchanted gardens and has some secrets of his own.
A young, brilliant wizard from a far - flung wizarding community could be introduced. He comes to the Ministry of Magic to share some unique magical knowledge or technology that his community has developed. He could be a bit of an outsider at first, but gradually becomes an important part of the Ministry's operations.
A healer who was a friend of Lily's could be introduced. This healer could have some special knowledge about the magic that Lily used to protect Harry, and could help Harry understand more about his mother's abilities.
A young and talented Seeker from a far - off wizarding school. This character could be really fast and have an almost sixth - sense when it comes to finding the Snitch. They could come from a school that has a very different approach to Quidditch training, like they train in the middle of a thunderstorm to improve their reflexes.
In a Royal Ward Harry Potter fanfic, new characters could include a wizard named Theodore. He's from a long line of seers but his powers are different as he can see glimpses of the past that are related to the current situation in the Royal Ward. There could also be a witch named Lily (not related to Harry's mother), who is an expert in magical plants and is in the Royal Ward to study a rare plant that only grows there. And a young squib named George who has a unique ability to sense magic in objects, which proves useful when Harry is looking for a hidden magical item in the Royal Ward.
Another possibility is McGonagall again. She has been an excellent teacher and deputy headmistress for a long time. Her experience and strict but fair nature would ensure the smooth running of Hogwarts. She already has a great relationship with the students and faculty, and could continue to uphold the school's traditions while also making some positive changes.
In this fanfiction, perhaps a new character is an old wizard who has been trapped inside the mirror for centuries. He has a lot of ancient magic knowledge and he becomes a mentor - like figure to Harry. He helps Harry understand the true power of the mirror and how it can be used to save the wizarding world from a new threat.
Harry Potter himself could be one of the main characters. He has a natural inclination towards heroism and protecting others, so he would fit well as a Hogwarts Guardian.