One interesting concept could be the combination of magic from Harry Potter and the unique battle system of Undertale. For example, a character might use a Patronus charm in the style of an Undertale monster's attack. Another concept could be the interaction between Hogwarts houses and the different areas in Undertale. Like Slytherin characters might be more drawn to the more dangerous or morally ambiguous parts of the Undertale world.
One interesting concept could be an OC that is a powerful mage in the Undertale fanfic world. They could have unique spells that interact with the game's existing magic system in unexpected ways.
One concept could be exploring the psychological state of the character who undertakes the genocide route in more depth. For example, how they gradually lose their sense of morality and what drives them to keep going despite the horror they are causing.
In Harry Potter fanfic, character pairings that are different from the original can be really interesting. For instance, some fanfics might pair Hermione with Draco. This creates a whole new dynamic as they have very different personalities and backgrounds in the original story. Magic - based concepts can also be explored further. Fanfic writers might come up with new spells or magical creatures that fit well within the Harry Potter universe. They can also expand on the magic system, like how different types of magic interact with each other.
One interesting concept is alternate timelines. For example, what if Harry had been sorted into Slytherin instead of Gryffindor? It could completely change his relationships and the whole story's dynamic. Another concept is character backstories. Fanfic often delves deeper into the pasts of minor characters, like Neville's family history before he came to Hogwarts. And then there are crossovers, like when characters from Harry Potter meet characters from other fantasy worlds, which can create really unique and exciting scenarios.
One interesting concept could be the crossover of characters' personalities. For example, how the determination trait from Undertale might interact with the more mysterious elements in Deltarune. Another could be the exploration of different timelines. Since both games have some elements related to time and alternate realities, a fanfic might delve into how these timelines could cross or affect each other. Also, the unique magic systems of both could be combined in creative ways, like how the soul powers in Undertale might work with the magic in Deltarune.
One interesting concept could be alternate character development. For example, a fanfic might explore how a character like Neville Longbottom could have developed different magical abilities or a more assertive personality. Another concept could be different relationships. Maybe a fanfic shows a closer friendship between Harry and Draco that changes the whole dynamic at Hogwarts.
In 'harry potter economy fanfic', the role of the goblins in the economy is fascinating. They control the wizarding banks and have a unique understanding of wealth and currency. Their lending practices and how they manage the gold reserves of wizards can be a great concept to explore. Also, the trade of magical potions ingredients between different regions in the wizarding world might be an important part of the economy.
One interesting concept could be a story where the Obliviation spell in the Harry Potter world goes horribly wrong on a large scale. Maybe an inexperienced wizard accidentally obliviates an entire village, and Harry has to find a way to reverse it. Another concept could be a fanfic where Voldemort uses the Obliviation spell in a new and devious way to gain an advantage over the Order of the Phoenix. For example, he could obliviate key members of the wizarding community about important events or knowledge related to fighting him.
One interesting concept could be the idea of a wizarding royal family. They might have unique magical powers or artifacts passed down through generations. For example, they could possess a special wand that only royalty can use, which has powers beyond normal wands. Another concept could be the relationship between the royal family and Hogwarts. Maybe they have a say in the school's policies or provide special funding for certain magical research.
In Harry Potter servant fanfic, the idea of a servant having a special power or gift that aids the main characters is quite common. This power could be something like the ability to communicate with magical creatures in a deeper way, which then helps Harry and his friends in their adventures. It adds a new layer of mystery and assistance to the story.