Well, in many 'Harry Potter Mean Girl Fanfic', there's often the plotline of the mean girl causing trouble in Hogwarts. She might spread false rumors about other students, which can lead to all sorts of chaos in the school. Sometimes, she has a backstory that explains why she is so mean. Maybe she comes from a difficult family situation or has been bullied herself in the past and is now taking it out on others. And then there's the plotline where she tries to take over a particular group or club in Hogwarts, using underhanded means to do so.
A frequent plotline in these fanfics is the mean girl trying to undermine the main characters. She could be a Slytherin who doesn't like the Gryffindors' success. So she'll try to sabotage their Quidditch games or get them in trouble with the professors. Another common aspect is the mean girl's social climbing. She wants to be at the top of the Hogwarts social hierarchy. To achieve this, she'll befriend the popular students and try to push out those she sees as competition. This can create a lot of drama and conflict in the fanfic.
One common plotline could be a friend turning against Harry due to jealousy. For example, Ron might be jealous of Harry's fame and betray him by revealing his secrets to the Death Eaters. Another could be a teacher who was thought to be trustworthy, like Snape in a different scenario, actually working against Harry all along. Or perhaps a new character introduced in the fanfic who befriends Harry only to betray him for some dark magic - related motives.
Perhaps the girl has a special connection with the Sorting Hat. It could be that the Hat reveals a hidden prophecy about her when it is placed on her head. This prophecy then sets her on a path to save Hogwarts from a new and unknown threat. She might have to team up with students from all the houses to fulfill the prophecy, and in the process, learn about the true meaning of unity among the houses.
One common plotline is them teaming up to fight a common enemy that threatens both their worlds, like a dark wizard who also has an alliance with some Greek monsters.
Power and influence are also common themes. In 'Harry Potter', there's the power struggle between Voldemort and the good guys. In 'Gossip Girl', it's all about who has the most influence in the Upper East Side. In fanfic, these two ideas often merge. Maybe a character from 'Gossip Girl' tries to gain power in the wizarding world or vice versa. For instance, Nate Archibald might try to use his charm to gain a position in the Ministry of Magic.
In many of these fanfictions, a common plotline is how Harry's newfound ability as a metamorphanimagus affects his relationships. For instance, he might have to keep it a secret from some of his friends at first, which could lead to some misunderstandings. Also, some stories might explore how his ability makes him a target for certain dark wizards who want to use his power for their own evil purposes. Additionally, there could be plotlines where he uses his metamorphanimagus form to explore parts of the wizarding world that are usually off - limits, leading to all sorts of adventures and encounters with magical creatures or hidden secrets.
In 4th - year Harry Potter fanfics, a popular plot is Harry's training for the Triwizard tasks. He could be getting secret help from an unexpected source, like a former champion or a hidden teacher at Hogwarts. His relationship with Cedric Diggory can also be a major part of the story. It might start as a rivalry but develop into a mutual respect. Plus, the way the fanfic portrays the magic in the tasks, like the underwater scene in the second task, can be really interesting and unique to each writer.
One common plotline could be a centaur female guiding a Hogwarts student on a journey through the Forbidden Forest. Since centaurs are known for their knowledge of the forest, she could use her expertise to help the student find something important or avoid danger. Another could be a story where a centaur female has a connection with a particular magical creature and the main character has to enlist her help to solve a mystery related to that creature.
It could mean a story related to Harry Potter but not in the style of a typical fanfic for the Potter series. Maybe it's a story that takes a different view on Harry Potter, like a critical analysis or a parody that doesn't follow the fan - created norms.
One possible plotline could be that a new strain of magical typhus breaks out in Hogwarts. The students and teachers have to figure out how to contain it while also dealing with the regular Hogwarts drama. Maybe Hermione tries to research a cure using both magic and Muggle medicine knowledge.
In a 'poison Harry Potter fanfic', a plotline might involve a poisoning attempt on a major character like Dumbledore. This could send the whole wizarding world into chaos as they try to figure out who the culprit is. Harry, Hermione, and Ron would then be on a quest to find out the truth. They might suspect Snape at first, but as they dig deeper, they discover a much more complex conspiracy involving other dark wizards. Another possible plotline could be that a magical poison is used to control the minds of some wizards, and Harry has to break the spell and find the antidote to save his friends and the wizarding world from being taken over by the poison - controlled minions.