Well, in certain fanfictions, Hermione's lion animagus form is also depicted as having a unique bond with the magical creatures in the wizarding world. Since lions are known for their leadership in the animal kingdom, she could lead groups of magical beasts to safety during a crisis, like when there's a rampage of some dark - influenced creatures near Hogwarts. Her lion form gives her an edge in understanding and communicating with these animals on a deeper level.
One common plotline is that Hermione discovers her ability to be a lion animagus while researching in the library. It could be that she stumbles upon an ancient spell or a long - forgotten text that triggers her transformation. Then, she has to keep it a secret from most of the Hogwarts faculty while learning to control her new form.
In fanfiction, Hermione can have various interactions with Animagus characters. For example, if an Animagus character is a friend of Hermione's, they might go on adventures together. The Animagus ability can add an interesting element to the story, like when they need to solve a mystery and the Animagus form helps in sneaking around or gathering information.
I'm not entirely sure if there is a specific fanfiction with 'Harry is a black lion animagus' but it's a very interesting concept. The Harry Potter fandom is vast and diverse. Some fanfictions are really well - hidden. You might have to dig deep into the archives of fanfiction websites or even contact some of the more dedicated Harry Potter fanfiction writers to see if they are aware of such a work.
Her Animagus form could also bring her closer to other Animagus characters. She might form a special bond with them, sharing secrets about their experiences and learning new magical techniques related to being an Animagus. This could expand her social circle within the wizarding world and lead to new adventures with these like - minded individuals.
One possible fanfiction could be where Fred and Hermione discover their Animagus forms together. Maybe they transform in the Forbidden Forest and have to rely on each other to get back to Hogwarts safely. Their forms could be something that represents their personalities, like Fred could be a fox, known for its cleverness and playfulness, and Hermione could be an owl, symbolizing wisdom.
In some fanfictions, Hermione as an animagus snake can be portrayed as having enhanced stealth. She might use her snake form to access restricted areas in Hogwarts, slithering through small cracks and hidden passages. For example, she could be on a mission to discover a hidden secret related to the founders of the school, and her snake form gives her an advantage in exploring the castle's nooks and crannies.
A prevalent theme is the role of the animagus form in social relationships. The lion animagus might be feared or respected by others. In some fanfictions, they are seen as a symbol of power and leadership. This can lead to different reactions from other characters, such as jealousy or admiration. There's also the theme of secrecy. Since being an animagus is not common, the characters usually have to keep their identity a secret, which adds a layer of mystery and tension to the story.
One possible fanfiction could be where Harry discovers his ability to turn into a Black Lion Animagus during a dangerous encounter in the Forbidden Forest. He uses this form to protect his friends from a dark creature that has invaded the school grounds.
Unfortunately, I can't recommend one directly. However, once you start your search, pay attention to the tags and summaries. If the summary seems interesting and the tags match what you're looking for, it's likely to be a good read.