Dumbledore would be an interesting addition. He has a lot of knowledge and power, and his interaction with Merlin would be fascinating. Ron could also be included for some comic relief and his loyalty would be an asset in any adventure that combines the two universes.
Morgana from Merlin could be a great character to include. She could be either an antagonist or an ally depending on how the story is written. Neville could also be part of the story, perhaps learning some new courage from Merlin's tales of his own heroic deeds.
Well, Sirius Black could be an interesting character to put in a 'Harry Potter Dursleys fanfic'. Since he was Harry's godfather, his presence could stir things up for the Dursleys. He might be furious at how they treated Harry and take some sort of action. Hermione and Ron could also be included. They could visit Harry at the Dursleys' and be shocked at the living conditions. Their reactions and how they interact with the Dursleys could make for an exciting plot. And of course, the Weasley family as a whole. Their warm and loving nature would contrast greatly with the cold Dursleys.
Obviously, Harry Potter and Nicolas Flamel are essential. But also including characters like Hermione Granger would be great. Hermione's thirst for knowledge would make her a perfect student of Flamel's teachings.
Well, clearly Merlin and Harry Potter are the main characters. Merlin, with his powerful magic and wisdom from a different era, and Harry, the boy - who - lived from the modern wizarding world.
Well, Harry Potter would be the main character of course, given that he is the 'Son of Merlin' in this fanfic. His friends Ron and Hermione are likely to be important characters too, as they are always by his side in the original series and would probably play significant roles here as well.
Akeno Himejima could also be a great addition. Her dual nature of being sweet but also having a darker side would create an interesting dynamic with Harry. They could have some really engaging conversations about power and morality.
Ron can also be included. He might be a bit clueless at first about their relationship, but then he can become a source of comic relief as he tries to play matchmaker or accidentally gets in the way of their romantic moments.
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.
Neville Longbottom is a wonderful character to add. He has grown so much throughout the series and can be a great support to the trio. Dumbledore, even if in a ghost - like or memory form, can offer his great wisdom. Also, Draco Malfoy can be included in an interesting way. Maybe in fanfiction, he has a change of heart and teams up with the trio against a greater evil.
Hermione is always a great character to include. As a kid, she could be shown solving even more complex problems than in the books. Her intelligence and determination can drive the plot forward in fanfiction.