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.
Hermione's confidence could be shaken at first. She is used to being a powerful witch, but as a Nunbu, she has to relearn everything from basic movements to using her new - found abilities. However, as she overcomes these challenges, she could emerge with an even stronger sense of self. She would learn to be resourceful in different ways and combine her old knowledge as a witch with the new experiences as a Nunbu.
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 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.
In such a fanfiction, there could be a lot of chaos. Maybe Harry and Ron would be completely clueless on how to take care of baby Hermione. They might struggle with simple things like feeding her or changing her diapers. It could also be a really cute scenario where they try their best to protect her in this vulnerable state.
Well, in most fanfictions like this, it could be a made - up spell. Maybe something like 'Femina - Transformo' that Hermione has created or discovered in a hidden book. But it really depends on the specific fanfic writer's imagination.
She might discover new magical abilities that are unique to elves. For instance, elves are very good at household magic. Hermione could use these new skills to improve the living conditions in the Gryffindor common room. She could make the furniture more comfortable or keep the room cleaner without using much effort.
Well, as a centaur, Hermione would likely gain some centaur - specific magical powers. She could use her enhanced speed and strength to explore areas that were previously difficult for her as a human. And she might communicate with other centaurs in a way that reveals new magical secrets about Hogwarts or the Forbidden Forest.
One great Hermione turns into a werewolf fanfiction is 'Moonstruck Hermione' on FanFiction.net. It has an interesting plot where Hermione's transformation brings out new aspects of her personality and her relationships with other characters, like Harry and Ron, are explored in a unique way.