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.
The main character is Harry. Additionally, there could be Hagrid. Hagrid was there when Harry was a baby and knew his parents. He could assist Harry by using his knowledge of the magical world at that time. And then there's Snape. Snape had a complex relationship with Harry's parents. In the fanfic, he could either be an ally or an obstacle depending on how the author writes it, but he is definitely a character that could be involved in the story of Harry saving his parents.
One possible plotline could be that Harry discovers a powerful time - traveling spell in his third year at Hogwarts. He decides to use it to go back in time and save his parents. Along the way, he has to face challenges like avoiding detection by the time - turner regulations and dealing with dark wizards who are also lurking in the past.
Obviously, Harry Potter would be the main character. He is the one doing the saving. Ron Weasley and Hermione Granger are also likely to be main characters as they are Harry's closest friends and often by his side in his adventures. Dumbledore might also play an important role, even if he's dead in the original story, his influence could still be there guiding Harry. And of course, there would probably be villains, perhaps Voldemort or some new dark wizard created for this fanfic.
Obviously, Harry's parents, James and Lily, would be main characters as their portraits are central to the story. Dumbledore could also be an important character. He might be the one who either hid the portraits or knew where they were all along and guides Harry to them.
The main characters are obviously baby Harry, his father James Potter, and his mother Lily Potter. They are central to any story about baby Harry and his parents.
The main characters are Dudley and Harry. Dudley, who has usually been portrayed as a bully in the original series, is now the hero. Harry, on the other hand, is the target of whatever danger is present in the fanfiction. There might also be other supporting characters like Dudley's parents or some of Harry's friends from Hogwarts who could play a role in the story.
Hermione and Ron are usually quite common. Since they are Harry's best friends, they would be involved in the story when Harry's parents return. They might be curious about his parents, and also help Harry and his parents adjust to the current situation.
In this fanfic, Chaos is surely one of the main characters. As for the others, it could include Athena, the goddess of wisdom. She might play a crucial role in devising plans to cooperate with Chaos to save Olympus. There could also be a centaur or a nymph that has some special knowledge or ability that aids in the whole process. Another possible main character could be Apollo, with his powers of light and prophecy being useful in the fight against the threats to Olympus.
The main characters are likely Booth and Bones. Booth is probably the one who takes on the role of the savior, while Bones is the one in need of being saved.
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.