There's a chance they'll meet some sort of time - keeper or guardian in the future. This character could be in charge of making sure the timeline isn't disrupted by their presence. Or they could meet future Hogwarts professors who are teaching new and exciting magical subjects that Harry and Ginny have never heard of before.
In this fanfiction, they could meet future versions of their friends, such as Ron and Hermione. Maybe Ron has become a great inventor in the future, and Hermione has made even more contributions to the magical library. They might also come across new characters who are the result of future relationships and events in the wizarding world.
They are likely to meet their future selves. This could be a very strange and enlightening encounter for both of them. They might also meet their descendants, like their children and grandchildren, which would be a heartwarming experience.
Definitely Captain America. Their relationship has always been complex and full of different ideologies. Meeting future Tony would be a big moment for Steve as he would see how Tony has changed or what new ideas he brings. Also, Thor would likely interact with him. Thor, with his Asgardian knowledge and power, would be interested in the future technology Tony might bring. And of course, Black Widow. She's the master of espionage and would be curious about Tony's motives and what he's hiding from his future.
Obviously, Harry and Ginny are the main characters as they are the ones raising the kids. Their kids would also be important characters. Depending on how many kids they have in the fanfiction, each kid could have their own unique personality and story arc.
The main characters are Harry and Ginny for sure. But it's also possible that some of the villains they faced in life, in a reformed state, could be part of the story. For example, Draco Malfoy could be there, having had a change of heart in the afterlife. This would add an interesting dynamic to the story as they all interact in this new realm.
Obviously, Harry and Ginny are main characters. Harry, with his knowledge of the future events and his skills as a powerful wizard. Ginny, who is also a talented witch. And then, of course, the Marauders - James Potter, Sirius Black, Remus Lupin and Peter Pettigrew. They are the ones being taught, so they are also central to the story.
Harry Potter himself would probably be a main character. After all, he's the hero of the original series and would likely be at the center of any attempt to fix the future. Hermione Granger would also be a key figure, with her intelligence and knowledge of magic.
Obviously, Harry and Ginny are the main characters. Their kids would be important characters too. For example, James, Albus, and Lily. Then there could be their friends like Ron and Hermione, who might be the godparents or just good friends who are always around to give advice or help out.
He could meet the local wizarding elders in Salum. They might be very wise and have a different way of doing magic compared to what Harry is used to.
Well, perhaps they will discover that magic has merged with Muggle technology in the future. Harry and Ginny could be amazed to find flying cars that are powered by both magic and electricity. They may also encounter new forms of dark magic that they have to fight against, or they might see a future where the wizarding world has achieved complete peace and harmony, and they play an important part in maintaining that peace.
A young scientist would be a great main character. They could be curious about what the future holds for their research and accidentally stumble upon a way to travel to the future. Their scientific knowledge would help them understand the new technologies and concepts in the future world.
Obviously, Ginny Weasley is one of the main characters. She's a strong - willed and brave witch. The Marauders, which include James Potter, Sirius Black, Remus Lupin, and Peter Pettigrew, are also likely to be main characters. They are known for their mischief - making and loyalty to each other. Dumbledore might also make an appearance as he was around during the Marauders' time and would surely have some role to play if Ginny is interacting with that era.