Obviously, Harry and Sirius are the main characters. Harry, the protagonist of the Harry Potter series, and Sirius, his godfather.
Neville could be part of it too. Maybe he sees Harry's training and gets inspired to improve his own magical abilities. He could learn from Harry's experiences under Sirius's training. And the Weasley twins might show up to add some mischief and perhaps even create some magical gadgets to aid in Harry's training.
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 Merlin are the main characters. Harry, the young wizard from Hogwarts, and Merlin, the legendary wizard from the past.
It could be about Sirius teaching Harry advanced magic skills like Patronus charm. Sirius, being a skilled wizard, might train Harry to be better at dueling and facing dark wizards.
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.
Obviously, Harry and Merlin are the main characters. Harry is the one being trained, and Merlin is the trainer.
Well, clearly Harry Potter and Sirius Black are the main characters. Harry is the protagonist of the original series, and here he has a special connection with Sirius as he rides him. Sirius, in his animagus form of a large black dog, provides the means of transportation and is also a very important character in the Harry Potter universe.
The main characters are Harry and Sirius. Harry is the famous wizard boy from the Harry Potter series, and Sirius is his godfather. In this fanfiction, they are likely to be at the center of the story, with their relationship and the events related to the 'happiness hamper' being the main focus.
Well, perhaps Sirius trains Harry in advanced defensive magic. Harry could learn spells like the Patronus charm more effectively under Sirius's tutelage. Sirius might also teach Harry about the wizarding world's secrets that Dumbledore didn't share.