One possible scenario could be that Harry grows up on the streets, learning to fend for himself and developing a tough exterior. He might encounter some kind of mentor figure who helps him discover his magical abilities in a very different way than in the original story.
One common plot twist is that his family actually has a noble reason for abandoning him. Maybe they were trying to protect him from a greater evil that they knew was coming for him. Another is that Harry discovers he has a hidden power that his family was afraid of, which led to the abandonment. For example, he could have a power that is considered dark but is actually something that can be used for good.
Snape could also be a central figure. Maybe he discovers Harry's situation early on and has a change of heart. He could secretly guide Harry, teaching him things about magic and the wizarding world that he otherwise wouldn't know, all while still maintaining his aloof exterior.
He would probably try to figure out what went wrong. Harry is a curious and determined character. He might start to recall recent events to see if there were any signs of his friends' discontent. He could also try to reach out to them, either directly or through mutual acquaintances, to ask for an explanation.
In such fanfictions, Harry might overcome the emotional trauma by finding true friends. These friends could provide the love and support his family didn't. For example, he could meet someone like Hermione who is intelligent and empathetic. She could help him study and also be there for him emotionally. Another way is through self - discovery. Harry could realize his own worth outside of his family's view of him. He might discover he has unique magical abilities that make him special and valued in the wizarding world.
One possible reason could be jealousy. Maybe Harry has achieved something great and his friends can't handle his success. For example, if he gets a very important role in a magical competition, his friends might feel overshadowed. Another reason could be a misunderstanding. Harry might be wrongly accused of something, like being in league with the dark side, and his friends, in their fear or haste, abandon him without giving him a chance to explain.
Maybe it's Ron. Suppose Ron gets jealous of Harry's fame and power and, in a moment of weakness and envy, decides to abandon Harry to die. This would create a lot of drama as Ron and Harry have been friends for a long time, and such a betrayal would be a huge shock to the story's readers.
One possible plot could be that Harry's mate is influenced by dark forces. Maybe they are threatened or corrupted, which leads them to abandon Harry. Harry then has to find his own way to survive. He might discover new powers or allies in the process, and in the end, seek revenge on those who made his mate turn against him.
Well, Luna Lovegood could be a great ally for Harry. She has an open - minded and accepting nature. She might see something special in Harry even though he's been abandoned and would offer him her unique brand of friendship and support. Dumbledore, if he's still around in the fanfiction, would also be a key ally. He has a lot of knowledge and power and would likely take an interest in Harry's situation, guiding him and protecting him. And then there's the Weasley family. They are known for their warmth and kindness. Even if Harry is abandoned, they might take him in and be his family, with Ron being his closest friend among them.
In such a fanfiction, Naruto might grow up feeling extremely lonely and having trust issues. He could become more self - reliant, forging his own path without any family support. Maybe he would be more eager to prove himself to the village, not just to gain their acceptance but also to show his absent family what they missed out on.