Hermione Granger is a very common character. Since she is Harry's best friend, she would likely be there to help him understand and control his new superpowers. She might research in the library to find out how these powers came about and how to use them effectively. Ron Weasley is also common. He would probably be both in awe and a bit jealous of Harry's new powers at first but would still support him in the end.
Luna Lovegood might be another character that interacts with Harry. With her unique perspective on magic, she could offer some out - of - the - box ideas about Harry's superpowers. For example, she might suggest that his power has a connection to some rare magical creature that no one has thought of before. And of course, Voldemort would be a key figure. His reaction to Harry having superpowers would be one of fear and determination to destroy Harry even more, leading to some intense confrontations.
Dumbledore would be an important character in such fanfiction. He would be the wise guide for Harry. Dumbledore might offer his insights on how to use the superpowers for good and how to avoid the temptations that come with great power. Snape could also be involved. He might be initially suspicious of Harry's new powers but later realize that they could be used to defeat Voldemort. His interactions with Harry would be filled with his usual mix of sarcasm and underlying care.
Hermione is usually one of the main characters that interact with Harry. She might be in awe of his new powers at first but then help him use them wisely. Ron could also be there, perhaps being a bit more skeptical at the start but eventually coming around. Dumbledore might also play a role, guiding Harry even in his god - like state, sharing some of his own deep knowledge of magic.
Ron is also there. He could be Harry's right - hand man in some adventures related to his lordship. For example, when Harry has to deal with some dark wizards threatening his lands, Ron might be by his side, using his Weasley - family - taught magic skills.
Sometimes, new original characters are created in fanfiction to help Harry. These could be students from other wizarding schools who have unique skills. For example, a student from a school in a far - off land who has mastered a type of magic that is unknown in Hogwarts and uses it to help Harry in his fight against the dark forces.
Hermione is often a key character. She might stand by Harry's side, using her intelligence and loyalty to help him through the tough times. She could be the one to encourage him to keep going and not let the disownment break him.
Obviously, Harry Potter himself is the central character as he's the one getting the wish. Hermione and Ron are also commonly involved. They are Harry's best friends, so they would be there to support him or perhaps even influence his wish. Dumbledore also often shows up in these fanfictions. As the wise headmaster, he might guide Harry on how to use his wish wisely or warn him of the consequences.
One character that would surely interact with Harry is Hagrid. Hagrid is always there for Harry in the main series, and in the fanfiction of traveling through books, he could introduce Harry to new magical creatures that are relevant to the specific book he has traveled into. Luna Lovegood could also be part of it. Her unique perspective on magic and the world could help Harry see things in a different light as he navigates through the different book - based scenarios. And then there's Ginny. Ginny, being Harry's love interest in the original series, would likely play an important role in the fanfiction, perhaps being involved in some of the adventures Harry has while traveling through the books.
Definitely Sam and Dean Winchester. They would be like his surrogate brothers or mentors. Then there's Castiel, the angel. He could have some interesting interactions with Harry, perhaps being intrigued by his magic. Bobby Singer could also be there, guiding Harry in the ways of hunting.
Well, Harry could marry one of the veelas. Given their beauty and allure, it would add an interesting dynamic to the story. Their relationship could involve Harry having to deal with the jealousy of other wizards and also the cultural differences of the veelas. Or he could marry a descendant of one of the founders of Hogwarts. This would tie in a lot of Hogwarts history into their relationship, and their wedding could be a grand event that unites different factions within the wizarding community who have ties to the founders.
Maybe Dumbledore, if he were still alive in the fanfiction. Dumbledore was highly respected and had a great influence. Knighting Harry would be a way for him to publicly recognize Harry's achievements and heroism on a grand scale.
Ron would also be there. He might start out a bit reluctant, but then get into it. He could be Harry's partner in physical challenges, like having races on broomsticks or wrestling magical creatures in a controlled environment for fitness.