There could be some original characters too. Maybe there's a mysterious old wizard who lives on the outskirts of the Forbidden Forest and has some ancient knowledge about dragons. He could sense that Harry is raising a dragon and come to offer his wisdom. And there might be a group of students who are jealous of Harry's dragon - raising adventure and try to cause trouble for him.
Ron and Hermione would surely be there. Ron might be a bit hesitant at first about Harry raising a dragon, but he would come around to help. Hermione would use her vast knowledge of magic and creatures to assist Harry in taking care of the dragon.
The dragon, of course, is a major character. It could be named something unique like 'Fyrstorm'. There might also be Hermione and Ron. Hermione would probably be worried about the legality and danger of raising a dragon, while Ron might be both scared and a bit excited about it.
Well, it could start with Harry finding an injured dragon. Out of compassion, he decides to take care of it. He might use his magic skills and knowledge from Hogwarts to nurse it back to health. As the dragon grows, he has to find ways to keep it under control. He could face problems like the dragon's growing appetite and its natural instinct to be wild. Maybe he even has to enlist the help of his friends, like Ron and Hermione, to keep his dragon - raising a secret from the school authorities.
Obviously, Harry Potter himself would be one of the main characters. And the first - years he's raising, though they might be a group of nameless first - years at first, some of them could emerge as more prominent characters as the story progresses.
The main characters are Harry and Teddy, but don't forget about the wizarding community around them. There could be other minor characters such as Teddy's teachers at Hogwarts when he gets older. They would play a part in Teddy's development, and Harry would interact with them to ensure Teddy has a good educational experience.
Maybe Neville could be involved too. He has shown great courage in the original series. In this fanfic, he could be the one who has some prior knowledge about the dragon due to his family's history in the wizarding world. His knowledge could be crucial in helping Harry enter the dragon's territory and deal with whatever lies within.
Obviously, Harry Potter is a main character. Since he is the son of a dragon in this fanfic, his character development would be central. There might also be his friends like Ron and Hermione. They would probably play important roles in helping Harry understand and deal with his new identity. And perhaps there are some dragon characters as well, like his dragon parent or other dragons that he encounters during his adventures.
Typically, there would be the Dragon Lords themselves. They are often powerful wizards or witches with a special affinity for dragons. There might also be some well - known Harry Potter characters like Harry, Hermione, and Ron who get involved with the Dragon Lords in the fanfic. For example, they could be helping the Dragon Lords in a quest related to dragons.
I don't know for sure, but it could be a new student at Hogwarts who has a special connection to dragons. Maybe it's someone who was raised by dragons and is now trying to fit into the wizarding school environment.
There could be a dragon - like character who is not exactly a dragon but has dragon - like features due to the inheritance. This character could be a mentor or a guide to the main character, teaching them about their new powers and the history of dragon inheritance in the wizarding world.
I think Dobby could be an important character. Since Harry is raising himself, Dobby might take it upon himself to secretly help Harry. He could provide some food and small comforts when Harry is all alone. Another character could be Hedwig. She would be more than just a pet; she could be Harry's only true companion, helping him in small ways like delivering messages or even warning him of danger.