One possibility is that it could communicate with the characters in a different way. If it was a cat like Crookshanks, it could use its human form to convey important information that it couldn't as a cat. Maybe it has seen something in the wizarding world that only an Animagus could understand and needs to tell Hermione and her friends.
Yes, in some Harry Potter fanfictions, Hermione's pet could be an Animagus. Fanfiction writers often come up with creative and unique ideas, and making Hermione's pet an Animagus can add an interesting twist to the story. It might change the dynamics between the characters and create new adventures.
In this fanfiction, if Harry is Hermione's pet as an Animagus, he would likely use his animal instincts to protect her. For example, if there's a threat in the Forbidden Forest, his animal senses might pick it up before Hermione notices. He could also play a role in helping her with her research. Maybe he could lead her to some interesting magical creatures she's studying by leaving little hints in his animal form.
In this kind of fanfiction, perhaps a group of young wizards are exploring the concept of Animagus transformation when they accidentally open a portal to a realm related to Cthulhu. They then have to use their Animagus forms in unexpected ways to survive and close the portal. Their Animagus forms might start to take on some Cthulhu - like features as they are exposed to the strange energy from that realm. This could lead to a lot of internal struggle as they try to keep their sanity and their wizarding identity while dealing with these new and terrifying changes.
Perhaps Harry was trying to hide from some danger. He knew that Hermione's place was one of the safest. So he transformed into his Animagus form and made his way to Hermione, and she took him in as a pet. In his animal form, he could stay close to her and keep an eye on things while remaining undetected by the source of the danger.
Well, if Harry Potter becomes a Phoenix Animagus in fanfiction, he would gain some really cool abilities. For example, he could regenerate from ashes like a phoenix. He might also have the power of flight, which would be a huge advantage in battles or just for getting around quickly. His connection to magic could become even stronger as the phoenix is a very magical creature. And he could use his new form to spy on the Death Eaters without being detected easily.
Dumbledore could be his mentor. He has vast knowledge and experience, and he would likely see the potential in Harry being an Animagus. He could guide Harry through the difficult process of learning to control his transformation and use his Animagus form for good.
In fanfiction, if Harry and Hermione become Animagus, they could have many new adventures. For example, they might use their animal forms to spy on the Death Eaters without being detected. Harry could become a stag, like his Patronus, which would give him speed and grace in the forest. Hermione might become an owl, as owls are associated with wisdom and knowledge, just like her. They could communicate secretly in their animal forms, adding an exciting new layer to their relationship and their fight against evil.
One possible plot could be that Hermione accidentally casts a spell on Harry during one of their Hogwarts adventures, turning him into a pet. She then has to take care of him while trying to find a way to reverse the spell. Along the way, they encounter various challenges and have to rely on their friendship to get through.
If Harry were a Dragon Animagus in the First Task, it would change the whole dynamic. He could use his dragon form to create a diversion. For example, he could make the real dragon chase him away from the egg, and then quickly transform back and snatch the egg. Also, his dragon form might have some special abilities like breathing fire in a controlled way to fend off the real dragon if it attacks.
Well, he might sell magical creatures like owls, toads, and perhaps even some rare and exotic ones like hippogriffs. He could use his knowledge of magic to take care of the pets and also teach the customers how to handle them properly.