There could be a young wizard or witch who is also on the run from the dark forces. This character could seek refuge with Sirius and Harry. They could become friends with Harry and together they could learn and grow. Additionally, a wizard historian who knows a great deal about the Potter family's past could be introduced. This historian could provide crucial information about Harry's heritage and the secrets that his family has been keeping for generations.
One potential new character could be a magical creature that Sirius has befriended over the years. It could be a creature that Harry has never seen before, like a phoenix - like being with unique powers. Also, an old acquaintance of Sirius from his days in the Order of the Phoenix who has some special skills or knowledge could be introduced. This person could help Harry and Sirius in their battles or in uncovering some secrets about Harry's family.
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.
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 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.
He could meet Bella. Since Forks is Bella's hometown in the 'Twilight' series. They might become friends or have some kind of adventure together.
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 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 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.
A new demigod from a previously unheard - of god or goddess. Maybe a child of a minor deity who has some unique powers that could either help or hinder Percy in the situation of the collapse. For example, a child of Hypnos who can manipulate sleep and dreams, and their powers could be used to either give Percy visions of how to fix things or put him in a dangerous trance.
A potential new character could be a magical art teacher who has the ability to bring out the best in Evillustrator's powers. Another could be a street artist who becomes friends with Evillustrator and gets caught up in the superhero - villain drama. Maybe a young aspiring artist who looks up to Evillustrator and tries to help him turn good.
A young dragon rider from a distant island who has a very different style of riding and communicating with dragons. This character could bring new techniques and ideas to Hiccup and his friends.
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.