Obviously, Harry and Merlin are the main characters. Harry, the young wizard from Hogwarts, and Merlin, the legendary wizard from the past.
The main characters are surely Harry and Merlin. But it's possible that some of the Hogwarts professors could be part of the story too. They might be skeptical about Merlin's training methods at first but later come to see the value in it. And then there could be some magical creatures that Merlin uses to teach Harry certain skills. For example, a phoenix could be used to teach Harry about the power of rebirth in magic.
Well, apart from Harry and Merlin, there could be other characters as well. For instance, Hermione and Ron might play important roles. They could be curious about Harry's new training and try to support him in their own ways. Dumbledore could also be involved. Maybe he is the one who discovers Merlin's presence and arranges for Harry to be trained by him. Or there could be some new characters introduced, like an old friend of Merlin's who has some unique knowledge that helps in Harry's training.
Obviously, Harry and Merlin are the main characters. Harry is the one being trained, and Merlin is the trainer.
Harry is surely the central character in 'harry trained as a pet fanfiction'. Besides him, it could be that his friends like Ron and Hermione are also involved, either trying to rescue him from this strange situation or being part of the process that led to his being trained as a pet. There might also be a new character, perhaps a dark wizard or a quirky magical creature, who is responsible for the training.
Obviously, Harry and Sirius are the main characters. Harry, the protagonist of the Harry Potter series, and Sirius, his godfather.
Obviously, Naruto and Merlin are the main characters. Naruto is the one being trained, and Merlin is the trainer.
Hermione and Ron are likely to be main characters too. They are Harry's closest friends in the original series, and in this fanfiction, they would probably play important roles in helping Harry understand and deal with his new identity as Merlin's heir. They might assist him in researching about Merlin, or they could be by his side when he faces new challenges because of this heritage.
Well, perhaps it could be about Merlin using his ancient and powerful magic to train Harry in combat skills. Maybe he teaches Harry spells that have been long forgotten.
Well, it could be that Merlin teaches Harry some ancient and powerful magic. Maybe Merlin shows Harry how to control magic in a more instinctive way, different from what he learned at Hogwarts.
The main characters would be Harry Potter and Batman. Harry Potter, the young wizard from the wizarding world, is the focus as he is being trained. Batman, the Dark Knight from Gotham, brings his skills and knowledge to the table. There might also be some appearances from other characters in the Harry Potter universe, like Hermione and Ron, who could react to Harry's new training. And in the Batman side, perhaps Alfred could also play a role, providing support or advice in the training process.
The main characters are Harry Potter and Thor. But it's possible that some other important characters from both universes could play a role. In the Harry Potter universe, Dumbledore might have an opinion on Harry's new training. And in the Thor universe, Odin could be aware of Thor training an outsider like Harry. Their reactions and interactions could add more depth to the story in this fanfiction.
Well, one possibility is that Harry would become an even more powerful wizard. Merlin could teach him ancient spells and magic that are long forgotten in the wizarding world of Harry's time. Harry might gain a deeper understanding of magic's origin and be able to use magic in ways that are more instinctive and powerful. He could also learn about different magical cultures from Merlin's vast experience.