The Dursleys play a big role too. Their reactions to Harry's early magic can vary widely in fanfiction. Vernon might be more enraged and try harsher methods to suppress it, while Petunia could have a moment of realization about her sister's world that she has been trying to deny. And Dudley might be either scared or jealous of Harry's abilities. Also, Hagrid would still be an important character, as he would be the one to bring Harry into the wizarding world, but his interactions with an even younger Harry could be different and more fatherly in some interpretations.
Obviously, Harry Potter himself is the central character. Then there's Dumbledore, who might be even more vigilant in protecting Harry earlier due to his early magic display. Hermione could also be involved, perhaps being even more intrigued by Harry's early magical experiences and trying to study them.
Obviously, Harry Potter himself is the central character. Then there are often the Dursleys, who would have to deal with Harry's early magic in different ways. Sometimes, Hagrid might also be involved earlier, coming to rescue Harry from the chaos caused by his early magic manifestations.
Well, Harry Potter himself is surely one of the main characters. Since it's about him discovering magic early, he'll be at the center of the story.
Harry Potter himself is often involved. Writers might explore how he could use the magic eye in different ways to solve mysteries or fight against the dark forces. Hermione would also be a common character. She could study the magic eye and try to understand its mechanics and magic better.
In some fanfictions of 'harry discovers magic early', he might accidentally perform magic in front of the Dursleys much earlier than in the original story. This could lead to either extreme fear or a strange kind of acceptance from them. Maybe they try to hide it from the wizarding world for their own gain. For example, Vernon might see it as a way to make money if he can control Harry's magic.
In addition to the main characters related to Naruto directly, some fanfictions might include other village elders or shinobi who knew about the Uzumaki clan's past. For instance, an old ninja who was friends with Kushina's parents could surface with crucial information about Naruto's heritage. There could also be antagonists who are interested in Naruto's newly discovered heritage for their own evil plans.
Snape is a character that could play a major role. Given his past with dark magic, he might be a reluctant mentor to Harry, guiding him in understanding the power and danger of it. Dumbledore, too, would likely be in the story, as he is always concerned about Harry's well - being and actions.
One interesting scenario could be Harry accidentally performing magic in front of the Dursleys much earlier than in the original story. For example, he might make Dudley's pudding float right in front of their eyes, which would lead to a huge commotion in the household.
Obviously, Harry Potter is the main character as the title implies he is the one learning magic early. But there could also be Hermione and Ron. Hermione might be intrigued by Harry's newfound knowledge and Ron could be both a bit jealous and in awe of Harry's early magical abilities.
Besides Harry, Hermione is a key character. She can research and find loopholes in the Ministry's laws and regulations. Ron is there too, providing muscle and emotional support. Neville Longbottom could also be involved. He has grown into a strong and brave wizard, and he might join Harry's cause. Additionally, Luna Lovegood with her unique perspective on magic could offer different ways of approaching the conflict with the Ministry. Some fanfictions might also include Sirius Black, if set in a timeline where he didn't die, as he has a history of opposing the Ministry's unjust actions.
One interesting plot could be Harry accidentally using magic in front of Muggles before he goes to Hogwarts. This would create a whole new set of challenges as the wizarding world would have to cover it up to avoid the Statute of Secrecy being broken.