Family legacy is also quite common. Given that many Slytherins come from pure - blood families with long legacies, the OC in these fanfics often has to deal with the expectations and burdens that come with their family name. They might struggle to live up to their family's reputation or try to break free from the traditional ways of their family. This theme adds depth to the character and the story as a whole.
Another theme is loyalty. Despite the reputation of Slytherin sometimes being seen as self - serving, fanfics often show the OC's loyalty to their friends or house mates. For example, they might stand up for a fellow Slytherin in a difficult situation. It also shows that loyalty can be complex and not always straightforward. Moreover, redemption is a theme too. Some Slytherin OCs start off with a not - so - great reputation but through their actions and growth, they seek redemption and to change others' perception of them.
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 self - discovery. Slytherin male OCs often start out with a certain view of themselves and then through various experiences in the wizarding world, they learn more about their true nature. For example, they might realize they are not as cold - hearted as they thought.
One common theme is the struggle against the Slytherin stereotype. Many male oc stories in this genre focus on the character trying to break free from the negative image associated with the house, like being overly ambitious in a bad way or being sneaky. For example, the oc might show that ambition can be used for good, like achieving great things in magic without stepping on others.
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 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.
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 common theme is friendship. Since there are three OCs, their relationships with each other often form a big part of the story, like in 'The Trio's Friendship' where they rely on each other through thick and thin.
One common theme is the struggle against prejudice. Since Slytherin has a reputation for being the 'evil' house, Harry often has to fight against the preconceived notions of others. For example, in many fanfictions, the Gryffindors are initially suspicious of Harry being in Slytherin.
Another theme is loyalty. He has to decide who he is loyal to - his house, his friends, or his own beliefs. In some fanfictions, he might face a dilemma where his loyalty to Slytherin clashes with his friendship with students from other houses. This creates a lot of interesting plot twists.