It could start with a magical accident. For instance, a spell gone wrong in the Harry Potter world creates a portal that sucks the main character into the Highschool DxD world. Right from the start, he's greeted by some of the female characters in a rather interesting way that sets the harem aspect in motion.
The start could be a character from Harry Potter who has a special ability that is sought after in the Highschool DxD world. When he arrives in this new world, he is quickly surrounded by different characters, both male and female. But the female characters, in particular, are intrigued by him and start to form a harem around him due to his unique magical abilities and his 'outsider' charm.
One idea could be a crossover where a character from Harry Potter, say a young wizard, accidentally gets transported to the world of Highschool DxD. He then finds himself in the middle of the harem situation that is common in Highschool DxD. Maybe he uses his magic in unexpected ways in this new world.
The magic system in Harry Potter could be integrated by having characters from Highschool DxD learn spells. For example, Issei could learn the Wingardium Leviosa spell to lift objects during battle, giving him an unexpected advantage. The Portkey concept could also be used to transport characters between the two worlds quickly.
First, you should familiarize yourself with the original 'Highschool DxD' series. Know the characters, their personalities, and the overall world - building. Then, think about the premise of your fanfiction. Decide on the main plot, whether it's a new adventure for the harem or a different take on their relationships. You can start with a simple scene, like a conversation between Issei and one of the harem members, and build from there.
In Harry Potter, the power levels are mainly based on magical ability, like how well one can cast spells or create potions. However, in Highschool DxD, power levels are more about physical strength, demonic or angelic powers. In a crossover fanfiction, a powerful wizard like Dumbledore might be on a different scale compared to a high - level Devil in Highschool DxD. Dumbledore's magic is more about wisdom and knowledge - based spells, while a Devil's power could be more brute force and superhuman abilities.
Yes, there might be. The 'fanfiction' world is vast and diverse. There are often crossovers that combine different popular franchises in unexpected ways. However, the quality and nature of such a fanfiction can vary greatly. Some might be really creative, while others could be a bit of a mess.
First, you need to be familiar with both universes. Know the rules of magic in Harry Potter and the characteristics of the different races in Highschool DxD. Then, create a good plot that can blend the two worlds well. For example, a mystery that involves both magic and the Sacred Gears. Also, make sure your characters are well - developed. Let the characters from both worlds have their own personalities and growth arcs. And don't forget about the details. Describing the magical elements and the unique settings accurately can make your fanfiction more immersive.
It would probably be really wild. Picture Harry Potter in the Highschool DxD world with all its unique characters and concepts. Maybe Harry would have to deal with the devilish and angelic beings in a whole new way, using his magic skills from the Potterverse.
First, know the characters well. Study Issei's personality, his desires, and how he interacts with others in the original Highschool DxD. Then, think about the girls you want in his harem and their unique traits. For example, you could start with a simple scenario like Issei meeting a new girl at school who could potentially be part of his harem.
He could fit in by being the new and mysterious student. His different powers and abilities would make him stand out. The girls in the harem would be curious about him.
If Fem Harry was in Highschool DxD, the story would change in many ways. For one, the dynamic with the male characters would be different. Instead of the typical male - male friendships and rivalries, there could be more romantic or complex relationships. Also, Fem Harry might approach the challenges in the DxD world differently. Maybe she'd use her wits in a more feminine way. For example, instead of brute force, she could use her charm to get out of tough situations.