What could be the plot of a Harry Potter fanfic where he has a pet snake animagus?

There probably are. Fanfic writers love to explore different ideas within the Harry Potter universe. A story where Harry has a pet snake animagus could be really interesting. It might involve new magical abilities or adventures related to the snake form. However, it could also be a bit of a challenge to fit into the existing lore, but that's the fun of fanfiction.

One possible plot could be that Harry is cursed by a dark wizard, and as a result, he grows snake hair. He then has to deal with the reactions of his friends and teachers at Hogwarts. Some might be afraid of him, while others try to find a way to break the curse.

The snake could help Harry find his way around Hogwarts. You know, Hogwarts is a huge and complex place. The snake might be able to sense the different magical auras of different areas and lead Harry to where he needs to go, like the library when he has to study for an important exam or the Room of Requirement when he's in a tight spot.

Well, it could be that Harry's snake has some magical powers. Maybe it can communicate with other magical creatures secretly. It could help Harry in his adventures, like finding hidden passages or warning him about danger.

Maybe it's an anonymous gift from someone who has been observing Harry. This person could be a former student of Hogwarts who has a special connection to snakes and sees that Harry has a kind heart and would take good care of the snake. So they leave the snake for Harry to find with a simple note that just says 'For Harry Potter'.

The snake might help Harry in his search for Horcruxes. It could use its unique senses to detect the presence of dark magic associated with the Horcruxes. For instance, it could lead Harry to a hidden location where a Horcrux is concealed.

One possible plot could be that the female animagus is a transfer student to Hogwarts. She discovers some dark secrets about the school in her animagus form (let's say she's a fox). She teams up with Harry to uncover the mystery, and they face many challenges along the way, like dealing with magical creatures that are being controlled by the dark forces.

One possible plot could be that the dragon is a gift from a mysterious wizard. Harry at first is hesitant but soon grows attached to it. The dragon has special powers that draw the attention of both the good and bad in the wizarding world. Harry has to train the dragon and at the same time, deal with the political implications of having such a powerful creature. His friends are both in awe and a bit scared of the dragon, which also creates some tension in their relationships. And as the story progresses, the dragon becomes a key factor in a major battle against dark forces.

The dragon could help Harry in battles. For instance, in a fight against Voldemort's Death Eaters, the dragon's firepower would be a great advantage.

Well, one possible plot could be that Harry is somehow transformed into the snake against his will. He then has to figure out how to break the spell while being in the form of the snake and also being close to Voldemort. He might use his knowledge of Voldemort's secrets to his advantage even in that form.