Other characters could include his professional Quidditch teammates. There might be a tough but fair captain, a cocky star player who initially doesn't get along with Harry, and a kind - hearted newbie who looks up to Harry. Then, of course, there could be rival players from other teams. These could be the typical antagonists on the pitch, always trying to outwit Harry during the games.
There could also be some Quidditch officials. Maybe a strict referee who always seems to be nitpicking at Harry's plays, or a league organizer who has some sort of influence on Harry's career. And don't forget about the fans! There could be die - hard fans who idolize Harry and some who are jealous of his success, adding more drama to the fanfiction.
Another plot might involve Harry getting injured during a professional Quidditch match and having to struggle to get back in top form. This could include his journey of physical rehabilitation and mental strength building. In the fanfiction, it could also show how his teammates support him during this tough time.
Harry Potter himself is often a popular character in these fanfictions. Since he was a great Quidditch player in the original series, many fanfictions expand on his Quidditch career or have him mentoring new players.
Ron Weasley could be included. His friendship with Harry and his own skills (even if he's not as good as Harry or Ginny at Quidditch) could bring some comical moments. He could be the team's cheerleader or the one who always has a joke to tell in the locker room to ease the tension before a big match.
Hermione would likely be one of the characters. She's Harry's best friend and would probably try to find him and help him out. Ron might also be there, as he's always been by Harry's side. Dumbledore could be another character. He might be trying to keep an eye on Harry from afar, or perhaps he has a plan for Harry's new situation. Hagrid would also be a likely character. He has a soft spot for Harry and would want to make sure he's okay. And of course, the Dursleys themselves might make appearances, either to continue their mean - spirited ways or to have a change of heart.
Ron Weasley would be there too. He would add a bit of humor to the story. He might be the one who is a bit clumsy at first in the MMO but then has some unexpected moments of great skill, like when he discovers a new way to use a simple in - game tool in a creative way during a battle.
Hermione would likely be there. She is always interested in learning, so she'd be involved in any study related to magical creatures. Ron might also be around, perhaps getting into some comical situations with the creatures. Hagrid is another obvious choice, as he has a deep love and knowledge of magical creatures.
Hermione would probably be there. She might be worried about Harry and trying to stop him from getting too close to the Whomping Willow at first, but then gets involved in the adventure too.
Harry is the central figure for sure. Neville Longbottom could play a role. He might be one of the few who know where Harry is hiding and is trying to protect the trunk from being discovered. Hagrid could also be involved. He might bring Harry some food and supplies while he's in the trunk. And there could be some mysterious old wizard or witch who has some connection to the trunk and its magic.
Obviously, Harry Potter himself is the main character. His friends like Hermione and Ron are likely to be there. Hermione might offer her intellectual support and advice on raising the child. Ron could be there for some comical relief and also to provide a male friend's perspective. Harry's godson Teddy Lupin could also be an important character, as he might be someone Harry looks to for inspiration on raising a child without a traditional family setup.
Obviously, Harry himself. And his best friends Ron and Hermione would surely be there. After all, they have been through so much together with Harry.