One common theme is redemption. Slytherins are often seen as the 'bad guys' in the original series, but in these fanfics, they get a chance to redeem themselves through protection. For example, they might protect a Muggle - born student they previously bullied.
One great 'Harry Potter Slytherin Protectors Fanfic' is 'The Slytherin's Oath'. It shows how Slytherin students come together to protect the school in a unique way.
One common theme is the struggle against the Slytherin stereotype. The sister character often has to deal with the perception that all Slytherins are evil or dark - wizards - in - training. For example, in many fanfics, she might be really kind - hearted but is constantly judged by others because of her house.
A major theme is identity. These OCs are often trying to figure out who they are within the context of the Slytherin house and Hogwarts as a whole. They might struggle with the reputation of Slytherin, or their own family legacies. For example, in some fanfics, the OC has to decide whether to follow in the footsteps of his dark - wizard family members or break free and form his own path. Also, power is a common theme. They might be vying for power within the house, or learning to use their power in a more positive way.
One common theme is the idea of overcoming house differences. Since Slytherin and Gryffindor are often seen as rivals, in these fanfics, the female Slytherin and Harry have to break through those barriers. For example, in many stories, they start off distrusting each other because of their house affiliations.
One common theme is identity. Since Harry is in Slytherin instead of Gryffindor, he has to re - evaluate who he is. He's no longer the typical Gryffindor hero, and he has to figure out how to be a hero in his own way while being part of a house known for its cunning.
One common theme is redemption. Slytherins are often seen as the 'bad guys' in the original series, so protecting Harry gives them a chance at redemption. For example, they might be trying to make up for past wrongs or the actions of other Slytherins.
One common theme is the exploration of his dark side. Since he was known for his ideas on pure - blood supremacy, many fanfictions delve into his motives and how that ideology developed. Another theme is his relationship with the other founders. Some stories focus on the initial harmony and then the growing rift between them.
Love and jealousy are also common themes. With multiple characters in a harem, there is bound to be love triangles or more complex relationship webs. Jealousy can arise when one character feels that another is getting more attention or has a stronger connection to the central character, leading to interesting plot developments and character growth.
Another theme is self - discovery. When Harry (or the other main character) dates a Slytherin, they often learn new things about themselves. They might realize that they had misjudged Slytherins all along and this makes them re - evaluate their own beliefs and values. It's like a journey of personal growth for both characters involved.
One common theme is redemption. Many Slytherin family fanfictions try to show that the Slytherins are not all bad. They may have made mistakes in the past but are given a chance to make things right. For example, a character might be trying to break free from the dark reputation of their family.