Well, one consequence could be that Hermione has to adapt to a cat's physical abilities and limitations. She might find it difficult to communicate in the same way as before. For example, she can't simply speak her thoughts but has to rely on body language and meowing, which could lead to misunderstandings among her friends. Also, she may face challenges in dealing with her studies as a cat. Magic that was easy for her as a human might be more difficult to perform with paws instead of hands.
In the beginning, Pany's motives for turning Hermione into a cat could be a mystery. Maybe it was an accident or part of a bigger plan. As Hermione adjusts to being a cat, she may encounter other magical creatures that she wouldn't have interacted with as a human. These interactions could either help or hinder her friends' efforts to change her back. Her friends would be scrambling to find a cure, perhaps consulting different magical texts or seeking help from magical beings known for their knowledge of transformation spells. And there could be a race against time as Hermione may start to lose more of her human self - awareness the longer she stays as a cat.
One great 'Hermione turns into a cat' fanfiction is 'The Feline Transformation of Hermione'. It delves into how her friends react to her new form. Another is 'Hermione's Cat Adventure' which focuses on her exploring the wizarding world from a cat's perspective. There's also 'When Hermione Became a Cat' which has a really interesting plot about her trying to find a way to turn back while dealing with the mischief cats usually get into in Hogwarts.
Well, her communication changes a great deal. As a cat, she can't speak in the normal way. So, in some fanfictions, she has to find new ways to express herself. This could be through body language or by leading her friends to things she wants them to see. Also, her relationship with danger might change. She might be more cautious as a cat, or she could be bolder because she has new cat - like abilities to rely on. In some stories, she also becomes more attuned to the natural magic around Hogwarts in her cat form, which is an interesting development of her character.
One idea could be that Batman is turned into a cat by a villain's new experimental device. As a cat, he has to rely on his natural feline abilities like stealth and agility to still protect Gotham. For example, he could use his cat form to get into small spaces in buildings to gather evidence or spy on criminals.
In a Hermione turns into a Nundu fanfiction, the story could start with Hermione feeling a strange connection to the Nundu in the magical creatures' book. She becomes so intrigued that she tries to perform a spell to understand it better on a deeper level. However, the spell mutates and she transforms into a Nundu. As a Nundu, she experiences the world in a completely different way. She can't communicate with her friends as she used to. Her friends would first be shocked and then start looking for solutions in every magical book and from every magical expert they know.
One idea could be that Hermione turns into a Nunbu as a result of a magical experiment gone wrong. Maybe she was trying to study a new form of transformation magic and accidentally triggers this strange transformation. Then she has to figure out how to reverse it while dealing with the unique abilities and limitations of being a Nunbu.
One idea could be that Hermione turns into a centaur as a result of a misfired spell during a Defense Against the Dark Arts class. She could then struggle to adapt to her new form, having to deal with the physical differences like running on four legs and having a horse - like body. Meanwhile, her friends Harry and Ron would be trying to find a way to reverse the spell.
One idea could be that when Hermione turns into a boy, she has to deal with different social dynamics in Hogwarts. For example, she might be treated differently by the boys in Gryffindor. Some might be more competitive with her, while others might befriend her in a new way. In the fanfiction, it could explore how she uses her now - male identity to her advantage in magic studies, perhaps being able to participate in all - male magical dueling clubs or something similar. And she could also have an interesting time trying to hide this transformation from her professors, especially McGonagall who is very perceptive.
Well, he might find it really hard to operate his Bat - gadgets as a cat. His paws are not made for pushing buttons or typing on keyboards. So he has to figure out a way to adapt. Maybe he uses his cat claws to scratch out messages for Alfred to understand what he wants to do.