Well, perhaps in the fanfiction, the leopard serpentine is a symbol of an ancient and forgotten magic. A group of Hogwarts students stumble upon some old runes that seem to be related to the leopard serpentine. As they decipher them, they start to unlock a series of magical events. They might face challenges from those who want to use this new - found magic for evil purposes, and they have to fight to protect it and Hogwarts.
You could make it a form of Animagus. A character could transform into a leopard - serpentine hybrid. This would give them unique abilities like the speed of a leopard and the stealth of a snake. They could use these abilities to spy on the Death Eaters or to find hidden magical objects.
In Harry Potter fanfiction, the serpentine elements can be really fascinating. For example, some fanfics might explore the history of the Basilisk more deeply. Maybe they'll create new stories about how the Basilisk came to be in Hogwarts in the first place. Another aspect could be about the Parselmouth ability. Fanfiction might expand on how it's used in different situations that weren't shown in the original books.
The serpentine aspect can add mystery. For example, if there's a new serpent - like creature introduced, it creates an unknown factor that characters have to figure out. This drives the plot forward as they try to understand its nature and purpose.
Yes, there might be. The world of Harry Potter fanfiction is vast, and it's not uncommon for authors to create unique and unexpected scenarios, such as Harry having a snow leopard in their stories. You can try searching on popular fanfiction websites like Fanfiction.net or Archive of Our Own to find such a story.
One possible scenario in such a fanfiction could be that Harry discovers his ability to turn into a snow leopard during his time at Hogwarts. Maybe he's exploring the Forbidden Forest alone one day and feels a strange connection to the wild, which then triggers his Animagus transformation. It could add a whole new layer to his character, as he has to learn to control this new form and keep it a secret from those who might not understand or might use it against him.
The plot could revolve around Harry's struggle to accept his new form. He might initially be scared when he first transforms into a snow leopard because it's so different from his human self. As he gets used to it, he realizes that he can use this form to his advantage in the fight against Voldemort. For example, he could use the snow leopard's ability to traverse difficult terrains quickly to reach hidden Horcruxes.
One interesting plot could be that the leopard animagus is a secret protector of Hogwarts. They prowl around the grounds at night, keeping an eye out for any dark wizards or dangerous creatures. When the main characters start to suspect something strange is going on, they begin to investigate and eventually discover the truth about the leopard animagus.
There may be a fanfiction where a student at Hogwarts discovers they are a leopard Animagus. This could lead to a whole series of events where they have to learn to control their new form while also dealing with the normal Hogwarts drama like exams, friendships, and rivalries. They might be scared at first but then gradually embrace their unique ability and use it to their advantage, perhaps in the fight against the Dark Arts.
You should start by looking on major fanfiction platforms like Archive of Our Own (AO3) and Fanfiction.net. Just use the search bar and type in relevant keywords like 'Harry Potter' and'snow leopard'.