Well, in these fanfictions, the founders of the houses can also be very popular characters. Godric Gryffindor, Salazar Slytherin, Rowena Ravenclaw and Helga Hufflepuff. Their backstories and the original reasons for creating their houses can be explored in the context of a merge. For example, how would they react to seeing their houses combined? Their magic and wisdom could be a guiding force in the new Hogwarts that the fanfiction creates, and they could interact with the modern - day students in unique ways, perhaps teaching them new ways to use the combined house powers.
One interesting idea could be how the different house traits blend. For example, the bravery of Gryffindor with the wisdom of Ravenclaw might create a new kind of heroic and intelligent character. Maybe in a houses merge fanfiction, students from different houses work together more closely than in the original series, leading to unique friendships and adventures.
One interesting concept could be how the different traits of each house blend. For example, the bravery of Gryffindor with the intelligence of Ravenclaw might create characters who are not only fearless in the face of danger but also smart enough to strategize their way out. Another concept could be the new rivalries or alliances that form within the merged houses. Maybe the combined Slytherin - Hufflepuff group has an internal struggle between the ambitious Slytherin side and the loyal Hufflepuff side.
Hermione Granger is often a popular character in these fanfictions. Her intelligence from Ravenclaw and her courage from Gryffindor make her an even more dynamic character in merged - house scenarios. Harry Potter himself also remains popular as his leadership qualities can be enhanced when considering the merged houses. He can bring together different traits from all the houses and use them to fight against the dark forces.
In fanfiction, Gryffindor's opposite could be Slytherin in some aspects. Gryffindors are often seen as brave and bold, while Slytherins are more cunning and ambitious. Hufflepuff, with its values of loyalty and hard work, could be considered opposite to Ravenclaw's focus on intelligence and knowledge. For example, a fanfiction might explore a story where a Gryffindor and a Slytherin have to overcome their house differences to work together, highlighting their opposing traits like the Gryffindor's straightforwardness against the Slytherin's deviousness.
McGonagall as the Head of Gryffindor is often very popular. She's strict but fair and her powerful magic and no - nonsense attitude make for great stories. Fans like to write about her making tough decisions for the good of Gryffindor and Hogwarts as a whole.
The relationships between the houses can also be inspiring. There's always a bit of rivalry between Gryffindor and Slytherin. You could write a fanfic where students from these two houses have to work together on a project and they learn to see past their differences. And for Ravenclaw, their intelligence can be used to create a story where a Ravenclaw uses their smarts to solve a mystery that has been plaguing Hogwarts for years.
One way the worlds could merge is through a magical portal. Maybe a Hogwarts student accidentally discovers a portal that leads to the world of Princess Mononoke. The student could then introduce magic from the Harry Potter world to the people in Mononoke's world, like using spells to heal the forest spirits that are sick or injured. Another aspect could be the sharing of beliefs. The respect for nature in Princess Mononoke's world could influence the wizards in Harry Potter to be more in tune with the natural magic around them.
The worlds could merge through a magical portal. For instance, a wizard in the Harry Potter world accidentally creates a portal to the land of Jack the Giant Slayer while experimenting with a new spell. Then, characters from both sides start to interact. The wizards could teach the people in Jack's world about magic, and Jack could teach them about his skills in fighting giants.