Neville could be a great addition. He's been through his own struggles and has grown into a strong wizard. He can share his experiences of growing up and finding his place in the wizarding world with Teddy. And Luna. Her unique view of the world can open Teddy's eyes to different ways of thinking, and she can also be a very calming presence for him.
Definitely Hermione. She's so intelligent and can offer a different perspective. She could help Teddy with his studies and give him advice on how to deal with the academic pressure at Hogwarts. Also, Ron. His sense of humor can lighten the mood. He could be like an older brother to Teddy, joking around with him and teaching him some fun wizarding tricks.
Remus Lupin should be included, even if just in flashbacks. Since he was Teddy's father, his presence can be felt in the story. Harry can talk to Teddy about Remus, sharing memories and stories. This would help Teddy connect more with his father's legacy and also strengthen his bond with Harry as they both have a connection to Remus.
Luna Lovegood would be a great addition. Her unique perspective on magic could offer new insights to Teddy. Also, Ron could be included as Harry's best friend. His humorous and sometimes clumsy nature could add some light - hearted moments to the story.
In some fanfictions, there might be a plot where Teddy gets into trouble at Hogwarts. Harry, as a sort of mentor figure, steps in to help him out. This could lead to a strengthening of their bond as Harry defends Teddy and teaches him the right way to handle the situation. Maybe Teddy was wrongly accused of using dark magic, and Harry uses his experience to prove Teddy's innocence.
Definitely Sirius Black. Since he was one of Lupin's best friends and also had a strong connection with Harry. His presence can add a lot of drama and backstory to the fanfiction.
Well, Hermione would be a great addition. She could use her intelligence to help Harry and Moka understand the different aspects of their two worlds. For example, she could research about yokai and find ways to use magic to help Moka control her vampire side better.
The Cullens from the Twilight series are obvious choices. They could interact with Harry in various ways. For example, Carlisle's medical knowledge and his calm, father - like presence could provide stability in a dangerous situation that Harry and Edward find themselves in.
Most likely, Harry Potter would still be one of the main characters. Since it's in the Harry Potter universe, he's central to the story. He could be the one around whom the new bonds are formed or strengthened.
Hermione and Ron would probably be there. They are Harry's best friends, so they might be like aunt and uncle to Teddy. They could help Harry out with raising Teddy, like Hermione giving educational advice.
Obviously, Harry and Teddy are the main characters. Harry, who is from the well - known Harry Potter series, and Teddy, who is an important character in that universe as well. There might be other secondary characters depending on the specific plot of this fanfiction, but the central focus would be on Harry and Teddy's relationship.
Obviously, Harry and Gabrielle themselves are essential. But characters like Hermione can add a lot too. She could be the one to help Gabrielle with her studies when she visits Hogwarts. Ron can also be there for some comic relief and to show the difference between the Hogwarts and Beauxbatons students.
Definitely Dumbledore. His wisdom would be crucial in guiding Harry and Maxima in any situation. Hermione would also be great as she could research and figure out how Maxima's powers work in relation to magic. And of course, Hagrid, who could introduce Maxima to the more unique and dangerous magical creatures in the wizarding world.