Obviously, Harry Potter is a main character as the story is centered around him as a baby at the Dursleys. Then there are the Dursleys themselves - Vernon, Petunia, and Dudley. Vernon is the strict and often cruel uncle, Petunia is the conflicted aunt who has her own issues related to the wizarding world, and Dudley is the spoiled cousin.
One interesting plotline could be Harry showing early signs of magic that the Dursleys try to suppress. For example, he might accidentally make Dudley's toys float when he's angry or frustrated.
There are indeed. A lot of fanfiction writers like to take the concept of the Dursleys being kind to baby Harry and run with it. They might write about how the Dursleys initially had good intentions but got corrupted by their fear of magic later. Or they could create a scenario where the Dursleys truly care for Harry from the start, changing the whole dynamic of the early Harry Potter story. It gives a fresh perspective on the characters.
Well, family unity is often a theme. Since the Dursleys love baby Harry, it creates a more harmonious family environment. This is different from the original story where Harry was mistreated. Also, the exploration of how this love affects Harry's magical abilities and his relationship with the wizarding world is common. For instance, he might be more open about his magic to the Dursleys, and they in turn support his journey in the magical realm.
It could be Dumbledore. He might have realized that the Dursleys were not the best place for Harry after all and decided to take matters into his own hands, using his powerful magic to rescue baby Harry.
One possible scenario could be that a powerful wizard or witch, perhaps someone who knew James and Lily Potter well, comes to rescue baby Harry. They might use magic to bypass the Dursleys' defenses and take Harry away to a safer place, like a hidden wizarding community.
In the 'the dursleys abuse harry fanfiction', the abuse can be multi - faceted. Physically, Harry could be pushed around or hit by Vernon. Emotionally, Petunia might constantly compare him unfavorably to Dudley, which is really damaging to Harry's self - esteem. And socially, they might prevent him from having any friends over, making him feel completely alone in the world.
It's possible. In some fanfictions, authors might explore complex motives for the Dursleys' actions. Maybe they could be under some dark magic influence that makes them act out of character and in a more extreme way. However, this goes against the general perception of the Dursleys in the original series, where they are mainly just cruel and neglectful without such extreme murderous intent.
One consequence could be that Harry becomes withdrawn. He's so used to the abuse that he doesn't trust people easily. He might have nightmares often, reliving the moments of abuse. For instance, if Vernon has hit him before, he could have flashbacks in his sleep.
Well, in fanfic, the Dursleys' abuse of Harry can be shown in different ways. They might isolate him from the outside world. For instance, not allowing him to have friends or participate in normal neighborhood activities. They could also starve him, giving him very little food while Dudley gets plenty. This kind of treatment is often explored in detail in fanfiction to show how harsh Harry's life is with the Dursleys.