Well, a typical trope is the exploration of how the wizarding society views multiple pregnancies. It could be different from the Muggle perspective. Also, there's often the idea of the unborn children having special powers or destinies. This leads to a lot of speculation and protection efforts from the characters in the fanfiction. Additionally, the relationship between the parents might be tested or strengthened during the pregnancy period, which is also quite common.
In many 'Multiple Pregnancy' Harry Potter fanfictions, there is the trope of the children being a symbol of hope or a new beginning for the wizarding world. There could be a dark force threatening the wizarding world, and the unborn children are seen as the key to its salvation. Another common thing is the focus on the magical upbringing of the children even before they are born. Magic might be used to educate them in the womb or give them certain abilities early on, which is an interesting take on the magical world concept.
There are quite a few out there. You can start by searching on popular fanfiction platforms like FanFiction.net or Archive of Our Own. Some might explore how characters deal with the idea of multiple pregnancies in the wizarding world, perhaps with magical remedies and cultural differences in handling such situations compared to the Muggle world.
One common trope is the 'lost Pokemon in the wizarding world'. A Pokemon might end up in Hogwarts and the students have to figure out what it is and how to get it back home. Another is the 'Pokemon as a substitute for a familiar'. Instead of a normal owl or cat, a character has a Pokemon that does all the familiar - like tasks. For example, a Psyduck could be used to deliver messages, albeit in a more comical way.
Well, there's the trope of the fae heritage affecting her appearance. Maybe she has more elven - like features or her eyes change color. And there's the relationship trope. Her relationships with other characters can be greatly affected. For instance, a potential love interest might be initially drawn to her because of her unique fae allure, but then they have to deal with the complications that come with her different nature. There can also be a trope where the fae inheritance makes her a target for dark forces who want to use her powers for evil.
One popular Harry Potter pregnancy fanfiction could be 'The Unexpected Arrival'. It might explore how a character, say Hermione, discovers she's pregnant during a time of chaos in the wizarding world. It could add an interesting layer of drama and character development.
One common trope might be Harry having multiple romantic interests at once. Since he's portrayed as a playboy, there could be a lot of flirting and love triangles. Another could be that he uses his fame in the wizarding world to his advantage in the dating scene. Maybe he gets special treatment from other characters because of his status, which then helps him in his 'playboy' ways.
One common trope is the 'hidden power' trope. In many fanfics, a character, often a new or overlooked one, discovers they have a powerful and previously unknown magical ability. For example, a Hufflepuff student might find out they can control time in a way not seen before in the wizarding world. Another is the 'alternate universe' trope where the story is set in a completely different version of the Harry Potter universe, like a world where Voldemort won the war and the characters have to deal with the consequences. The 'teacher - student relationship' trope is also popular, where a deeper bond forms between a student and a teacher beyond the normal classroom dynamic, like a special mentoring relationship between Harry and a new, young teacher.
One of the common tropes is the 'soul - bond' trope. In fanfiction, characters might be magically bonded at a soul level, which affects their relationship and actions. For example, Harry and Hermione could be soul - bonded, and it would change how they interact with each other and other characters. Another trope is the 'secret identity' trope. A character might have a secret identity or past that is slowly revealed throughout the fanfiction, adding drama and mystery. The 'reincarnation' trope is also seen sometimes, where a character is the reincarnation of someone from the past in the wizarding world.
One common trope is the 'knowledge advantage'. Since the character is reincarnated as Harry Potter, they often use their prior knowledge of the wizarding world's events to their advantage. For example, they might know about Voldemort's plans in advance and take steps to prevent them. Another trope is 'relationship changes'. They might interact differently with characters like Hermione and Ron, perhaps forming closer bonds or different types of relationships altogether. And then there's the 'power boost' trope. The reincarnated Harry often gains new magical abilities or is able to master existing ones more quickly due to their past experiences.
One common trope is the 'alternate universe' where the story takes place in a different setting than the original books. For example, a modern-day muggle world with hidden wizarding elements. Another is the 'character redemption' trope, like Draco Malfoy being redeemed and becoming friends with Harry. And the 'power - up' trope is also seen, where a character discovers new and greater magical abilities.
One common trope in uncaring Harry Potter fanfiction might be the divergence from Harry's usual empathetic nature. For example, he could be written as being aloof towards his friends. This could be used to explore different character dynamics, like how Hermione and Ron would react to a less caring Harry. Maybe they would try harder to get his attention or become frustrated with him.