Another theme is loyalty. In Slytherin, loyalty within the house is often emphasized. A male oc might have to choose between loyalty to his friends in Slytherin and doing what's right for the whole school. It's a complex theme that can lead to a lot of interesting character development. Also, self - discovery is common. The male oc often discovers his own strengths and weaknesses while in Slytherin, which is a key part of his growth in the story.
Power and its allure is a frequent theme. Since Slytherin is associated with power - hungry wizards in the original series, male oc fanfictions often explore how the character deals with the temptation of power. Some might resist it, while others might be lured in at first and then have to find their way back. Family heritage can also be a theme, especially if the oc has a special or secret family background related to Slytherin that influences his actions and decisions.
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 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.
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 the struggle for acceptance. Since Slytherin is often seen as the more 'ambitious' and sometimes 'dark - leaning' house in the Harry Potter universe, a pregnant Slytherin might face more judgment. So, the character often has to fight for acceptance from her peers and family.
Another theme is friendship. Harry forms new friendships in Slytherin that he might not have had in Gryffindor. These friendships often cross the traditional house boundaries and are quite interesting to read about. For example, he might become friends with some of the more complex Slytherin characters who have their own motives and backstories. Also, the theme of self - discovery is prominent. Harry discovers new aspects of his magic and personality as he is in a different house environment.
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.
One common theme is the struggle against prejudice. Since Hermione is a Gryffindor in the original series, in these fanfictions as a Slytherin, she has to face the existing biases towards Slytherin house. And with her necromancy abilities, there's often the theme of the ethical use of such dark magic.
One common theme is identity. Hermione has to grapple with this new identity as the heir of Slytherin, which is very different from her Gryffindor self. Another theme could be acceptance, both from herself and from others around her.
Friendship is also a big theme. Hermione has to navigate her relationships with her old Gryffindor friends and her new Slytherin acquaintances. Sometimes there are conflicts, like when her friends don't understand her new ways. But other times, they learn to accept and even admire the new Hermione.
One common theme is identity. Harry has to re - evaluate who he is when he's a pureblood Slytherin instead of a Gryffindor. Another theme is acceptance. He has to deal with whether the other houses, especially Gryffindor, will accept him.