Dumbledore, as Harry's guardian in the fanfiction, would probably use his influence in the wizarding world. He could make sure that Harry is taught by the best teachers at Hogwarts. He'd also be there to offer advice and guidance, especially when Harry faces challenges like dealing with Voldemort or other dark forces. For example, he might teach Harry some advanced defensive magic privately to better protect himself.
One reason could be that Dumbledore had too many other responsibilities in the wizarding world. He was the headmaster of Hogwarts and was constantly involved in dealing with the threat of Voldemort on a larger scale. He might not have been able to give Harry the individual attention and care that a true guardian should provide.
One possible reason could be that Dumbledore wants Harry to have a more normal upbringing away from the spotlight of Hogwarts and his own influence. So he deliberately steps back from the role of guardian.
Perhaps Sirius Black could be Harry's magical guardian instead. In the original story, Sirius had a strong connection to Harry and a great desire to protect him. Even though Dumbledore was a major figure in Harry's life, Sirius was his godfather and had a natural claim to the role of guardian.
In some fanfictions, Harry might be depicted as Dumbledore's pet in a metaphorical sense. It could be that Dumbledore is overly protective or manipulative in the story, making Harry seem like a 'pet' under his control. But this is not a common or canonical view, just a creative interpretation in certain fan - created works.
There probably is. Fanfiction is a place for fans to re - imagine the stories they love. With Dumbledore as Harry's grandfather, it could mean that Dumbledore had a more personal stake in Harry's well - being from the start. It might also lead to different backstories for Dumbledore himself, like how his family ties to Harry came to be. It could even change the way the final battle against Voldemort plays out, as Dumbledore's family connection to Harry could bring in new elements of strategy or sacrifice.
Well, it depends on the fanfiction. Some fanfic authors like to play with the idea for the sake of creating an interesting twist. They might make Dumbledore seem overly possessive or controlling of Harry in this 'pet - like' way. But other fanfictions stay truer to the original idea of Dumbledore as a mentor, and in those, Harry is not really a 'pet' at all.
Yes, there are likely fanfictions out there with this dark and alternative take. Fanfiction often explores non - canonical ideas, and this would be a very radical one. It goes against the established lore in the official 'Harry Potter' series, but that's the nature of fanfiction - to play with different concepts.