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.
In this fanfic, Harry is the main protagonist. However, it may introduce some new characters as well. But the classic main characters like Ginny Weasley, as Harry's love interest, could also be prominent. Luna Lovegood with her unique perspective might also be involved. The main characters also include those in the Order of the Phoenix. They could be working with Harry in different ways to save everyone. As for the bad guys, it could be a group of Death Eaters or a single powerful dark wizard who has a sinister plan that Harry has to thwart.
Harry Potter is the central figure in 'harry saves everyone fanfic'. His friends, Ron and Hermione, are main characters too. But it could also include other characters like Neville Longbottom, who has his own growth and importance in the wizarding world. Hagrid might also be there, providing his unique brand of support and wisdom. And don't forget the professors at Hogwarts, like McGonagall. They could be important in helping Harry or at least be part of the world that Harry is saving. And the antagonists would be those who pose a threat to the safety of everyone, which could be a variety of dark wizards or creatures.
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.
Well, obviously Sakura is one of the main characters as the title implies she is the one saving everyone. There could also be the people she is saving. They might be her friends, family, or just random people in the fictional world she exists in.
Dumbledore could also be an important character. He might be the one who tries to figure out what's wrong with Harry and tries to reverse this hatred. Another character could be Snape. He might see this as an opportunity to make Harry's life even more difficult or, on the other hand, might be secretly trying to help him get over this hatred.
In a 'harry saves everyone fanfic', one key plot point could be Harry discovering a new, hidden power within himself. This power might be the key to saving everyone. He could also form new alliances with unlikely characters. For example, he might team up with some Slytherins who have a change of heart. Another aspect could be that the situation is extremely dire, like the whole wizarding world is on the verge of destruction. Harry then has to go on a quest to find ancient magic or artifacts that can turn the tide and save all the wizards and witches from harm.
Obviously, Hermione is the central character. Harry and Ron are often also important. They might be in trouble and Hermione has to save them. For example, they could be captured by Death Eaters and Hermione devises a clever plan to rescue them.
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.
Most likely, Harry Potter himself would be one of the main characters doing the trolling. Given that it's in the title, he's probably at the center of the humorous and mischievous actions.
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 and the Jedi would be the main characters. Maybe Luke Skywalker and Harry could form an alliance.