Another interesting one is 'The Enchanted Highschool DxD'. In this fanfiction, the author delves deep into the magical lore of the Highschool DxD world. The magic is not just used for fighting but also for solving various mysteries within the school. It has a great blend of magic, mystery, and the typical Highschool DxD elements.
One great Highschool DxD Issei magic fanfiction is 'Issei's Magic Evolution'. It shows Issei developing unique magical abilities that are different from his usual power set in the original series. This adds an interesting twist to his character.
The combination of high school drama and magic is also a big draw. In these fanfictions, characters use magic to deal with typical high school problems like bullies or academic challenges, but on a much more fantastical level. It's a unique blend that gives a fresh perspective on both high school and magic themes. Also, the fan - created characters in these stories often bring new dynamics to the relationships and power structures in the Highschool DxD world.
Another reason is the fan community. Highschool DxD has a large and passionate fan base. When a fanfiction focuses on Issei and magic, it combines two elements that many fans are interested in. Fans like to share and discuss these fanfictions, which further spreads their popularity. Also, it allows fans to explore their own ideas and interpretations of the characters and the world, which is always appealing.
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.
A prevalent theme is also crossovers. Since it's a fanfiction combining Highschool DxD and Magic Knight, there are a lot of crossovers where the worlds and rules of the two series interact. For example, the magic systems of Magic Knight might be incorporated into the world of Highschool DxD, creating new and exciting storylines. And of course, the theme of adventure is also common as the characters embark on various quests and battles.
One idea could be an OC who discovers their God Slayer magic in a dangerous situation at the high school. For example, a sudden attack by a stray devil forces the OC to tap into this unknown power within them to protect their friends. This could lead to a whole new arc in the fanfiction where the OC has to learn to control and master the God Slayer magic while also dealing with the regular high school DxD drama like relationships and rivalries.
In a fanfiction, the blending could occur in a more dangerous situation. Let's say there is a rift between the two worlds and the magic is getting mixed up in a chaotic way. The characters have to figure out how to control this new, combined magic. They might find that some spells from Harry Potter work differently when combined with the energy of the devils in Highschool DxD. For example, the Killing Curse might be affected by the demonic energy and instead of just killing, it could turn a target into a half - devil. This would force the characters to understand both magic systems deeply and find a way to separate or control the combined magic before it causes more harm.
First, you need to define the origin of the God Slayer magic. Is it something passed down through generations, or did the OC obtain it through a special event? For example, it could be a gift from a mysterious being. Then, consider how the magic affects the OC's personality. If it's a powerful and dangerous magic, they might be more cautious or have a sense of responsibility. Also, think about how it interacts with the existing powers in the High School DxD world. Will it make the OC a target? Will they have to hide it?
You can try fanfiction websites like FanFiction.net or Archive of Our Own. They usually have a large collection of Highschool DxD and Magic Knight fanfictions. Just use their search functions to look for relevant stories.