One popular trope is the 'enemies - to - lovers' where characters who initially dislike each other, like Draco and Hermione, fall in love. Another is the 'forbidden love' trope, for example, a love between a Muggle - born and a pure - blood in a world with so many class differences in the wizarding world. And of course, there's the 'soulmate' trope where two characters are fated to be together.
There's the 'time - travel love' trope too. Imagine a character going back in time and falling in love with someone from a different era in the Harry Potter universe. Also, the 'love triangle' is quite common. For instance, Harry might be caught between two characters in a love triangle situation. And the 'hidden identity' trope where a character has a secret identity and falls in love while in that hidden state.
The 'reincarnation love' trope can be found in some fanfictions. Characters are reincarnated and find their way back to each other in different forms. Then there's the 'fake relationship' trope that turns into real love. Two characters pretend to be in a relationship for some reason, but then genuine feelings develop between them. And don't forget the 'love across houses' trope, like a Gryffindor falling in love with a Slytherin, which goes against the traditional rivalries.
One popular trope is the 'alternate universe' where the story takes place in a different setting or with different rules from the original series. For example, a world where Voldemort won. Another is the 'character rewrite' where a character's personality or backstory is changed. And the 'romantic pairing' trope, like Hermione with Draco, which explores relationships that weren't in the original books.
A common trope is power - related. In Harry Potter and Marvel fanfiction, you often see characters either sharing or comparing their powers. For instance, how would Captain America's physical abilities stack up against a wizard's magical skills? Also, the 'found family' trope is there. Characters from both universes coming together to form a new family unit, like some Avengers joining forces with the Hogwarts crew.
One popular trope is the 'crossover' where characters from Charmed and Harry Potter universes interact. For example, the Halliwell sisters might meet Harry, Hermione and Ron. Another is the 'power transfer' trope, like a Charmed one getting some magical ability from the Harry Potter world or vice versa. And the 'hidden relation' trope is also seen, such as a character from one universe being related to a character in the other in some unexpected way.
One popular trope is the 'alternate universe' where the story takes place in a different setting than the original books. For example, a modern muggle world with a hidden wizarding society. Another is the 'time - travel' trope, which allows characters to go back in time and change events. And the 'found family' trope is also common, where characters form deep bonds outside of their biological families.
One popular trope is the 'coming - out' story. This could involve a character like Harry Potter himself realizing and coming to terms with his bisexuality. It often includes the character's internal struggle, as well as how their friends and the wizarding world around them react.
One popular trope is the 'fish out of water' situation where the main character, often a self - insert or an OC, finds themselves in the middle of a harem of Harry Potter characters. Another is the 'enemies to lovers' within the harem, where some of the characters initially dislike the main character but then fall for them. Also, the 'power - up' trope is common, where the main character gains new magical abilities or knowledge through their interactions with the harem members.
A common trope is the 'alternate universe' idea. In these fanfictions, the wizarding world could have a completely different social structure or history. For instance, if the Death Eaters had won the war before Harry started at Hogwarts. Also, the 'romantic pairings different from the canon' trope is popular. Fans like to explore relationships like Hermione with Draco or Harry with Luna that are not the main focus in the original books.
One popular trope is the 'Chosen One's Harem'. Since Harry is the Chosen One in the Potterverse, having a harem around him can play on the idea of different characters being drawn to his power and destiny. Another is the 'School Harem' as Hogwarts is a central setting. Girls (or guys in some fics) from different houses might form a harem around Harry due to his heroics in school. Also, the 'Magical Bond Harem' where magical bonds, like a soul - mate type of bond, connect Harry to multiple characters in the harem.
One popular trope is the 'fish out of water' scenario. A fem Harry Potter in the realm of Hades would be quite out of place. She'd have to adapt to the dark and often unforgiving world of Hades. Another is the 'powerful outsider' trope. Given Harry's magical abilities, she'd be a force to be reckoned with in Hades' domain. And the 'romantic entanglement' trope is also common, perhaps a relationship between fem Harry and Hades or one of his minions, adding a layer of drama and passion to the story.
One common trope is the 'fish out of water' situation where the main character, often a new addition to the wizarding world, attracts the attention of multiple male characters. For example, a Muggle - born witch suddenly finding herself in the middle of a group of Hogwarts heartthrobs. Another trope is the 'forbidden love' aspect, like falling in love with a Slytherin when you're from Gryffindor and having to deal with the house rivalries within the reverse harem. There's also the 'powerful heroine' trope, where the female lead has some unique power or ability that makes her stand out and draws the guys to her.