In this kind of fanfiction, the main ones would be the Potter family. But it would also include Sirius Black if the story allows for his presence in some way, like a magical resurrection. Remus Lupin's family might be there too, if Tonks and their son Teddy were to be part of the reunion. And of course, the whole Weasley clan, from the eldest siblings to the youngest grandchildren, all gathering together to celebrate family.
Definitely Harry himself. Then, there could be his godfather Sirius Black if he was somehow brought back. His parents' old friends like Remus Lupin might also show up as they were like family to Harry. And of course, any remaining members of the Potter family line, such as distant cousins or aunts and uncles who were in hiding or just not known to Harry before.
Obviously, Harry and Hermione themselves are the central characters. Their spouses, if they have any in the fanfiction, would also be important. Their children would play a big role too, as they would be part of the new generation of the family. And of course, old friends like Ron, Ginny, and other Hogwarts alumni might make an appearance.
Hermione could be a main character. Since she was a Muggle - born witch, her Muggle schoolmates might be very curious about her new life. Harry could also be involved as he had some experience in the Muggle world. Maybe even Ron, as he's always curious about Muggle things. Their presence would bring an interesting dynamic as they try to balance their wizarding selves with the Muggle environment of the reunion.
Well, it might involve the Potter family getting together. Harry could finally introduce his kids to some long - lost relatives. Maybe Sirius Black, if he somehow was brought back, would be there. They would all sit around the fireplace and talk about the old days, how they fought against Voldemort. And then they might start planning for the future of the wizarding family, like ensuring the kids get the best magical education and how to keep the family name honorable in the wizarding community.
Obviously, Annabeth herself will be involved. Her parents might be there, if they are still alive in the context of the story. There could also be siblings if she has any. Extended family members like grandparents, aunts, uncles, and cousins might also make an appearance.
Her parents would most likely be there. Maybe some cousins, aunts, and uncles too. There could also be an estranged family member who decides to make an appearance.
Probably Natsu. Since he has been searching for Igneel for so long, finding his family or getting some real family - related news would make him extremely excited. He's always been a bit of a lonely dragon slayer without his real family around, so a reunion would be a huge deal for him.
Well, it could include the emotions of Harry's parents. Lily might have been feeling a mix of joy and anxiety. James would probably be very protective. Also, the description of their home, like how they decorated the nursery in a magical way, with floating mobiles of magical creatures.
There's also a possibility that it could be a minor character from the original series, like Neville Longbottom. He has grown a lot throughout the story. He might be the main character in this fanfiction, finally getting his own family after his heroics in the war. He could pass on his knowledge of Herbology to his children and create a family that is deeply involved in the study and protection of magical plants.
It could be his loyal owl, Hedwig. She might be staying with him in the attic, providing comfort and also being a messenger for him when he needs to communicate with his friends outside.