One way the story could develop is through cooperation. The two Harrys could team up to solve a mystery or defeat a common enemy. They could combine their skills and resources, like one Harry being better at Potions and the other at Defense Against the Dark Arts.
Another possibility is that they might not get along at first. They could have different views on things due to their different experiences. But as the story progresses, they gradually understand each other and learn from one another. This could lead to a more harmonious relationship and ultimately, a resolution to whatever problem brought them together in the first place. For example, if they were brought together to stop a dark wizard, they would learn to work together effectively to achieve that goal.
The story could start with Naruto being in a strange place and suddenly seeing his other self. Then they would start to exchange words. It might develop into a battle at first as Naruto tries to figure out if this other self is a threat.
If Harry meets the founders in fanfiction, the story might develop in a way that Harry is given a mission by the founders. This mission could be related to saving Hogwarts from an ancient threat that only he, with the help of the founders' knowledge, can defeat. Along the way, he would interact with different historical figures and magical creatures that the founders introduce him to.
His creativity would likely expand. Since he's teaching himself fanfiction, he would start to view his own world from different perspectives. This could make him more empathetic towards others in the wizarding world as he tries to understand different characters' motives and feelings through writing.
Harry would likely be more reserved. The Weasleys, especially Ron, brought out a more relaxed and fun - loving side of Harry. Without them, he might be constantly in a serious state, always on guard. His sense of humor might not be as developed, as Ron was often the one who shared a lot of the light - hearted moments with Harry.
Anakin could be angry. He might see his other self as a threat, especially if one represents his dark side and the other his light side. There could be a power struggle between the two versions of himself as they try to assert dominance over the other. Or he could be curious and eager to learn from his other self, about what he could have been or what he can still become.
Their relationship could start off with Charlie being a bit of a mentor to Harry. Charlie has a lot of knowledge about the magical world outside of Hogwarts, especially when it comes to magical creatures. Harry, being curious, would be eager to learn from him.
The plot could take a dark turn. Naruto's friends might become worried about him and try to stop his self - experimentation. This could lead to a conflict between Naruto's desire for power and his friends' concern for his well - being.
In the later part of the plot, there could be a turning point. Maybe Harry realizes that his isolation isn't helping him and that he needs his friends. Or perhaps an external threat arises that forces him to come out of his self - imposed isolation. This could lead to a rekindling of his relationships, and they all work together to face the new challenge stronger than ever before.
At first, their relationship might be a bit tentative. Harry would be surprised to see Remus near his relatives' place. But as they start talking, Harry would feel a sense of connection. Remus could offer some words of comfort and understanding about Harry's difficult situation with the Dursleys.
Their relationship might start off rocky. Minqto could be wary of Fem Harry due to her being different from what he's used to. But as time passes, he sees her determination and courage, and starts to respect her. This respect could then turn into a friendship.