In the fanfiction, the Dursleys' pet could be a normal pet that becomes enchanted by accident. For example, Harry accidentally casts a spell on it while practicing magic in secret. This causes the pet to gain human - like intelligence and it starts to understand Harry's situation. It then tries to help Harry by creating distractions whenever the Dursleys are being particularly mean to him.
One possible storyline could be that the Dursleys' pet, perhaps their cat, discovers Harry's wizarding abilities before the Dursleys do. It might then have some comical or tense interactions with Harry, like trying to stop him from using magic in the house for fear of getting in trouble itself.
One possible plot could be that the Dursleys receive a threat from the wizarding world that they can only be protected from if Harry stays with them and helps. Harry, being a good - hearted person, decides to do so and in the process, he starts to understand them better and grows to love them.
One possible motive could be extreme revenge. After years of being mistreated, locked in a cupboard, and generally being made to feel unwanted, Harry might snap in fanfiction. Another could be a sense of self - preservation if the Dursleys were somehow involved in a plot against Harry's life in the fan - created plot.
Petunia Dursley could also be a main character. She is in charge of the household and the pet. In the fanfiction, we could explore how she views the pet and how her attitude towards the pet changes when strange things start to happen, perhaps due to Harry's influence or the pet's own mystery.
The Dursleys are a rather uptight and narrow - minded family. In this fanfiction scenario, they could be extremely judgmental of Harry's girlfriend. They might look down on her if she doesn't fit their idea of what a proper person should be like. They may also be secretly afraid that she will expose their mistreatment of Harry, so they could act very defensively during her visit.
One possible storyline could be the children of the original characters starting their own adventures at Hogwarts. They might face new threats that are related to the past but in a different way. For example, a new dark wizard could be trying to revive the ideas of Voldemort and the kids have to stop it using the knowledge passed down from their parents.
One possible storyline could be that Harry is on the run from dark forces again and the tent serves as his only safe haven. He might be using magic to conceal the tent and make it a cozy, self - sufficient living space, with magical wards all around it for protection.
Perhaps in the fanfiction, Harry discovers that his grandparents had a hidden magical legacy. They had been working on a powerful charm to protect the Potter family long before Harry was born. Harry finds clues about this charm and with the help of his friends, he tries to complete it, believing it could be the key to finally defeating Voldemort.
Well, the Dursleys were extremely cruel to Harry. They locked him in his cupboard under the stairs for a long time. They also tried to prevent him from knowing about his magical heritage, which was a big part of who he was. Harry must have felt a great deal of resentment towards them for suppressing his true self.
One reason could be that he discovers a new threat and decides he can't stay with the Dursleys any longer for their safety. Another might be that he simply can't bear their mistreatment anymore and finds an opportunity to escape.
His relationships could be affected. Hermione and Ron might have to take on more of a caretaker role, which could change the dynamic of their friendship. Also, he may face discrimination or pity from other students at Hogwarts, which could further isolate him. And in terms of romantic relationships, his self - esteem due to his crippled state might make him less likely to pursue someone like Ginny.