Ron might also be there. He could be the one who offers Harry a place to stay at his own home if Harry is having trouble finding a place. Or, if they've had an argument, Ron could be the reason Harry is moving out in the first place.
Neville could be involved. He could bring some plants from the Hogwarts greenhouse that have healing properties. Luna Lovegood might also make an appearance. She could offer some of her unique and rather strange remedies or just be there to provide her calming and dreamy presence, which could have a positive effect on Harry's mental state during his recovery.
Dumbledore could play a crucial role. As the wise headmaster, he may have some prior knowledge about Harry's possible inheritances. He could guide Harry through the process, explaining the significance of any new powers or items he has inherited and how to use them for the greater good of the wizarding world.
Neville could play a role too. He has a deep connection to the magical creatures, and he might be sympathetic to Harry's idea of hatching the basilisk. He could offer some advice on how to handle the hatchling based on his own experiences with plants and other less - dangerous magical beings. Also, he could be the one to stand up for Harry when others start to question his motives.
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.
Hermione and Ron would most likely be main characters. They are Harry's closest friends in the original story. Since Harry is deaged, they would play important roles in taking care of him or guiding him in some way.
He could meet indigenous Canadian wizards who have their own unique magic traditions.
Harry could encounter a group of wizarding surfers. They use magic to enhance their surfing experience, like creating perfect waves or making their boards fly over the water. They introduce Harry to a more laid - back side of the wizarding world in California.
Even some of the professors could be involved. Professor Dumbledore, with his vast knowledge and wisdom, might have some connection to the magical trunk. He could be the one guiding the students in their exploration of it, or perhaps he has left some clues for them to discover. Professor McGonagall might also get involved if she senses that the students are in over their heads with the trunk's secrets and she needs to step in to protect them.
Dumbledore could make an appearance. He might be the one who gives Harry the idea to become a pilot in the first place or provides some ancient magical knowledge about flying that helps Harry in his new career. Also, the Weasley twins could be involved. They could create some magical gadgets for the plane, like a device that makes the plane do cool stunts.
Hermione Granger would surely be a key character. She is Harry's best friend and is known for her intelligence. She would use her knowledge of magic and laws to try and stop the execution. Ron Weasley would also be important. He would be by Hermione's side, providing his loyalty and bravery. Neville Longbottom could also play a significant role. He has grown into a strong wizard and might lead the resistance within Hogwarts against the Ministry's decision.