There could also be other characters like Harry's friends, such as Ron and Hermione. They might be involved in the story and notice the similarities between Harry and his grandfather, and through their reactions, the story could unfold in different ways.
They might be similar in appearance. For example, they could have the same eye color or the shape of their nose.
It could be an old and powerful wizard who has been in hiding for years. Maybe he was a friend of Dumbledore's but had some differences with him, so he stayed away from the main events in Harry's life until now.
The main characters are obviously the old grandfather and his grandson.
Obviously, Harry Potter himself is a main character. He is the one on the journey of discovering his heritage. There might also be Hermione Granger as she often helps Harry in his adventures and could be crucial in this discovery too.
Harry and Lemon are the central figures. Harry might be a brave and curious character, while Lemon could be kind - hearted and intelligent. Their personalities would likely drive the story forward as they interact with each other and the world around them.
Obviously, Harry Potter is the main character as he is the one trying to save his parents. His parents, James and Lily Potter, would also be important characters even though they are the ones being saved. There might also be other characters like Dumbledore. Dumbledore could play a role in guiding Harry in his mission, either by providing advice or by giving him some magical tool or knowledge that helps him in his quest to save his parents.
Obviously, Harry Potter is the main character since it's about him living on his own.
Obviously, Harry Potter himself is the main character as the whole concept is about him reliving his life. His friends like Ron Weasley and Hermione Granger are also likely to be main characters as they are an important part of Harry's life in the original story and will surely play a role in this new scenario.
Obviously, Harry would be the main character. He is the one taking control of his life. Hermione and Ron would most likely be important characters too as they are Harry's closest friends and would be involved in his journey. Dumbledore could also play a role, perhaps as a mentor figure that Harry starts to question and break away from as he takes more control.
In this fanfic, Harry is the main character. However, we could also expect to see Dumbledore making an appearance. Dumbledore has always been a guiding figure for Harry, and in a story about Harry showing his power, Dumbledore might offer some wisdom or crucial information. Neville could also be a key character. He has his own growth in the original series, and in this fanfic, he could be inspired by Harry's power and contribute to the overall plot in some way.