Their relationship often develops into a deeper, more trusting bond. Hermione's act of saving Harry makes him see her in a new light. He becomes more reliant on her, and she on him. For example, he may start confiding in her about his past abuse, which he never did before. This sharing of secrets brings them closer.
One example could be a story where Harry is verbally abused by some of his classmates in Hogwarts. Hermione steps in, using her quick wit and magic skills to defend him. She might cast a spell that makes the abusers' voices disappear when they try to say mean things. In this fanfiction, Hermione becomes Harry's protector, not just from the bullies but also from his own self - doubt that the abuse has caused.
There's a fanfic titled 'Snape's Redemption in Harry's Abuse'. This story focuses on how Snape, who has his own complex past with Harry's father, realizes that Harry is a victim of constant abuse. He decides to use his position as a teacher and his skills in potions and magic to keep Harry safe. It delves deep into the relationship between Snape and Harry, exploring themes of forgiveness and second chances.
One plot idea could be that Voldemort saves Harry from his abusers in the Dursley household because he realizes Harry's potential is being squandered there. He then takes Harry under his wing, not to turn him evil, but to train him in magic in a very different way than Hogwarts. Maybe he wants to use Harry as a tool against the Ministry, which he believes is corrupt.
There's also 'Draco's Salvation of Harry'. It delves deep into the reasons why Harry was being abused and how Draco, who has his own growth arc in the story, manages to rescue Harry. It shows the transformation of their relationship from rivals to something more like protectors of each other.
Often, in such fanfiction, they become more resilient. For example, if they are physically abused by Death Eaters, Harry might become more determined to fight against Voldemort and Hermione might use her intelligence to find ways to protect themselves and others. Their experiences of abuse shape them into stronger characters.
Harry's character would likely become more complex. Initially, he might be distrustful of Voldemort's motives but also feel a sense of obligation for being saved. This could lead to him being more cautious and calculating in his actions, as he has to navigate the dangerous waters of being associated with the Dark Lord.
One common trope is the 'unlikely hero' where Draco, who was once seen as an antagonist, becomes Harry's savior. Another is the 'healing journey' for Harry as he recovers from the abuse with Draco's help. There's also often the 'forbidden friendship' trope as they come from different sides of the wizarding world.
Some fanfictions could depict a scenario where they are abused by the wizarding media. False rumors are spread about them. Hermione and Harry rely on each other for emotional support. They work together to clear their names and in the process, their friendship becomes unbreakable. It shows how they can overcome external abuse through their strong friendship.
Well, in general, fanfiction about an adopted and abused Hermione is a rather dark concept. Ethically, it's a gray area. On one hand, fanfiction allows for creative exploration, but this theme might be disturbing to many. It could be seen as unethical if it promotes or glorifies abuse in any way.