Yes, there might be some extremely dark and out - of - canon fanfictions out there with such a disturbing premise, but it goes against the general nature of the original story where Harry's parents loved him deeply. However, in the vast world of fanfiction, people can create all kinds of strange and often inappropriate scenarios.
He could meet his future children, if he has any. They would likely be powerful wizards or witches with their own adventures. Also, he might run into the future versions of Hermione and Ron. They would probably be in important positions in the wizarding world, like Hermione might be a headmistress at Hogwarts or something.
He might meet the future versions of his friends like Hermione and Ron. Their children or grandchildren could be there, and they might have different personalities and magical skills compared to their predecessors.
In Harry Potter fanfiction, parents can be portrayed in various ways. Some are shown as overprotective, like Molly Weasley who is fiercely protective of her children in the original series, and this trait might be exaggerated in fanfiction. Others could be absentee parents, perhaps too busy with their wizarding jobs or studies to be fully present in their kids' lives. For example, in some fanfics, pure - blood parents might be preoccupied with maintaining their family's status in the wizarding world.
In addition to the Potters themselves, there are often original characters created for the fanfiction. For example, there could be a wizard or witch who was friends with James and Lily at Hogwarts but was not mentioned in the original books. These characters can bring new plotlines and perspectives. Voldemort is also a crucial character in many of these fanfictions, as his actions are directly related to the fate of the Potter parents.
Definitely not. The story of Harry Potter has a certain moral framework. His parents' love and sacrifice are what shape Harry's character and his journey. A fanfiction with such a concept distorts that and can be seen as disrespectful to the original work and its fans.
One possible reason could be that he might feel abandoned. Growing up without them, he could resent the fact that they left him an orphan. He might think that if they were really so great, they would have found a way to survive and be there for him.
It can contribute by adding new perspectives. For example, it might make fans think about the parents' generation in a way they hadn't before. But it also needs to be done tastefully.
He'd first have to get used to the new technology. If there are new magical devices, he'd need to learn how to use them. For instance, if there are advanced wands with extra functions, it would take him some time to figure them out.
He might be shocked. In fanfiction, the future could be full of strange twists. For example, if his friends' children are involved in some wild adventures that are very different from what he expects. He would probably be confused at first, then curious to understand how things got to that point.