One way she keeps her magic a secret is by disguising it as normal Muggle activities. For example, if she wants to levitate an object, she might use a pulley system that she secretly enchants to make it seem like a normal mechanical device. She also practices her magic in very isolated areas, like abandoned warehouses or deep in the woods where there are no Muggles around. Additionally, she might use Muggle technology to cover up any signs of magic. For example, if she accidentally makes a magical light appear, she can quickly turn on a flashlight to make it seem like it was just a normal flashlight all along. She has to be extremely cautious because if her magic is discovered, it could put both her and the Muggles she's around in danger.
Fem Harry Potter might keep her magic a secret in the Muggle world by constantly being on the move. By not staying in one place for too long, it's less likely that any suspicious magical activity will be noticed. She could also be very careful about the spells she uses. Instead of using common wizarding spells, she invents her own unique spells that are less likely to be recognized. For instance, instead of using 'Accio' to call an object, she creates a spell that has a similar effect but is completely unidentifiable as magic. And she would also avoid using magic around other people as much as possible, only using it when she's alone in a secluded place.
She could use a magic - suppressing charm. This charm would make it so that her natural magical aura is hidden from other wizards and even from magical detection devices. For example, if a wizard were to pass by her with a magical detection spell active, they wouldn't sense her magic. Another way is by only using very basic and small - scale magic when absolutely necessary. Like if she needs to light a candle in a power outage, she might use a very tiny and discreet fire - making spell that looks almost like a normal match being lit.
Well, it can change her relationships. For instance, she might be treated differently by male characters in the Muggle world compared to how Harry would have been. In romantic relationships, she may attract different types of partners. Maybe she'll have more female friends who she can bond with on a different level.
One interesting plot could be that Fem Harry Potter uses her magic in very subtle ways in the Muggle world to avoid detection. For example, she might use a charm to make her schoolbooks seem like normal ones so that no one suspects she's studying magic. Another plot could involve her making friends with Muggles who have an inkling that there's something different about her, and she has to constantly dodge their questions while also protecting them from any magical threats that might come their way. And she might also be on the run from some dark wizards who are trying to find her in the Muggle world, so she has to keep changing her identity and location.
She could be using magic. For example, she might use a concealment charm on herself to hide any physical signs of pregnancy. Hermione is very skilled in magic, so she could easily cast spells that make her look the same as before. She might also avoid situations where she would be in close contact with Draco. By staying away from him as much as possible, she reduces the chances of him noticing any changes in her.
One common plot is that fem Harry uses her magic subtly in the Muggle world while trying to stay hidden. For example, she might use magic to fix small things in her Muggle apartment without being noticed. Another plot could be her making Muggle friends and having to constantly be on guard not to let her magical identity slip. She may also encounter other magical beings who are also hiding in the Muggle world and they form a sort of underground magical community there.
He might adapt by using his skills learned in the wizarding world in a different way. For instance, his quick thinking from facing magical challenges can help him solve Muggle problems fast.
Her magic can be used for various things. It could be used for stealth missions, like making the team invisible. Simple spells like that would be very useful.
Muggle Magic in fanfiction can add an element of mystery. Since it's not as well - defined as wizarding magic in the original series, it can be used to create new and unexpected plot twists. For example, if a Muggle - created magic spell starts to interfere with the normal functioning of the wizarding world, it can lead to a whole new adventure for the characters.
Naruto could use clothing to her advantage. Wearing baggy and androgynous ninja outfits would help to conceal her feminine body shape. For example, the standard orange jumpsuit she often wears doesn't really give away her gender easily.
Her magic could directly influence the growth rate. She might use a simple spell to make the seeds sprout instantly. It could also affect the quality of the crops. For instance, a charm to make the fruits and vegetables extra large and full of flavor.
She might start using black magic out of a sense of desperation. Maybe she feels she has no other way to achieve her goals, like protecting her loved ones or getting revenge on her enemies.