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.
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.
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.
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.
Maybe some of Sirius' old schoolmates that he hasn't seen in a long time could be introduced. They could come to visit Sirius and Harry and bring with them new stories and magic. Another potential character could be a mysterious neighbor who is also a wizard but has been in hiding. This neighbor could either be a friend or a foe, adding an element of mystery to the story.
A half - veela character who uses her charm to get ahead in the Ministry but then realizes the importance of true merit. She could add an interesting dynamic to the often - stuffy Ministry environment.
Hermione could be a key character. She is always by Harry's side, and her intelligence and knowledge of the wizarding laws would be invaluable in the lawsuit. She might be the one doing all the research and preparing the legal arguments for Harry.
A young and talented artist could be a new character. The empress could commission the artist to create a portrait or some art for the palace, and in the process, a unique friendship or a complex relationship could develop. The artist could also be a source of inspiration for the empress in different ways.
One possibility could be Morgana. In some interpretations, she has powerful magic and could be reimagined as a more benevolent Goddess of Magic in the Harry Potter universe. Another could be a completely new character created specifically for the fanfiction, perhaps an ancient witch who has been watching over the wizarding world since its inception.
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.