One interesting plotline could be her using her Metamorphmagus ability to blend in different situations at Hogwarts. For example, she might change her appearance to spy on the Slytherins when they are planning something devious.
There's also 'Metamorphmagus Fem Harry: A New Perspective'. This one delves deep into how fem Harry's Metamorphmagus nature changes her perception of herself. She struggles with the idea of a constantly changing self, and how others perceive her. It's a very character - driven story that shows a different side of the Harry Potter universe with this unique take on the character.
It might make her more mysterious to her friends at first. They could be both intrigued and a little bit wary of her ability to change her appearance. But as they get to know her better, they come to accept and even rely on it in some cases.
In fanfiction, a female Harry Potter as a Metamorphmagus could have a very different Hogwarts experience. She might use her power to get out of tricky situations in classes or during Quidditch matches. Also, her relationships with other characters like Hermione and Ron could be affected. Hermione might be even more curious about the magic behind her Metamorphmagus ability, and Ron could be either in awe or a bit jealous.
One great 'Harry Potter' fanfiction with a Metamorphmagus in a Snarry pairing is 'Metamorphosis of the Heart'. In this fic, the concept of the Metamorphmagus adds an interesting layer to the relationship between Snape and Harry. It allows for unique interactions and character developments as the Metamorphmagus ability can be used to show emotions and changes in a very physical way within the story.
Identity is a common theme. Since fem Harry can change her appearance as a Metamorphmagus, she often has to grapple with who she really is. Is she defined by her looks or her inner self? Another theme is acceptance. How do the people around her accept or reject her because of her ability? For example, some might be jealous or scared of her power.
Think about their moral compass. Just because they can change their appearance doesn't mean they should use it for unethical reasons. A well - developed metamorphmagus OC could struggle with the temptation to use their power for personal gain, like cheating in exams by changing into a smart student. Their journey in learning to use their ability responsibly can be a great part of the fanfiction.
One possible reason could be copyright issues. The 'Harry Potter' franchise is very protective of its intellectual property, and fanfiction might sometimes cross the line in terms of using their concepts too freely. Another reason could be to maintain the integrity of the original story's lore. Since metamorphmagi are a specific part of the 'Harry Potter' world, perhaps some fanfictions were distorting or misinterpreting this concept in ways the rights holders didn't like.
One common theme is changing the past. Since it involves time travel, the Metamorphmagus often tries to correct something that went wrong in the past or prevent a future disaster. For instance, they might go back to stop Voldemort's rise to power earlier in the timeline.
One interesting story could be about a metamorphmagus OC who uses their ability to blend into different wizarding groups and uncover a hidden plot in Hogwarts. They might change their appearance to spy on suspected dark wizards within the school.