A unique character could have a different way of controlling the Juggernaut Drive compared to the canon characters. Maybe they can use it in short bursts without losing their sanity, which would be a very interesting twist.
You can give the character a unique backstory related to the Juggernaut Drive. For instance, if they were an experiment gone wrong and that's how they got the power. This would make them stand out.
Create a character who is not initially interested in the power of Juggernaut Drive but is forced to use it for the greater good. Their reluctance and then their growth as they learn to handle the power can make for a very unique and engaging character in the fanfiction.
One idea could be exploring the psychological effects on the character who activates Juggernaut Drive. They might struggle with the newfound power and the loss of control. For example, they could have internal battles between their normal self and the more aggressive, power - hungry side that the Juggernaut Drive brings out.
Power - up themes are common. The Juggernaut is a very powerful entity in the Highschool DxD universe in fanfictions. So often the stories revolve around the protagonist either obtaining Juggernaut - like powers or using Juggernaut powers in new and exciting ways.
One interesting feature is the exploration of Issei's enhanced powers. When in Juggernaut Drive, he becomes much more powerful than his normal state. Fanfictions often show him taking on tougher opponents and having more epic battles. For example, in some stories, he can single - handedly defeat high - level devils or fallen angels that he couldn't have before.
One popular 'Highschool DxD Issei Juggernaut Drive' fanfiction is 'The Red Dragon's Ascent'. It explores Issei's journey with his Juggernaut Drive in more depth, adding new plotlines and character developments. Another one could be 'Juggernaut Issei: New Powers Unleashed' which focuses on Issei's new abilities when in Juggernaut Drive mode and how it changes his relationships with the other characters in the story.
First, consider the world of Highschool DxD. Your OC should fit into this universe. So, if you want to make a devil OC, understand the hierarchy and politics of the devil society. For creating an interesting OC, you can also add some flaws. No one is perfect. Maybe your OC is overconfident and this often gets them into trouble. Another aspect is their relationships. They could have a complicated relationship with the main characters. For instance, they might start as an enemy of Issei but later become an ally due to shared goals. Also, give them a distinct voice in the story, which means how they speak and the words they use should be unique to them.
First, give your OC a unique backstory. For example, if your OC is a devil, they could have a tragic past that led them to become a devil. Second, think about their powers. Make them different from the existing characters in Highschool DxD. Maybe they have a special ability related to an element like ice or fire. Third, develop their personality. Are they shy, bold, or mischievous? This will make your OC stand out in the fanfiction.
You can start by combining the traits of different avatars and High School DxD characters. For instance, take the loyalty of a certain devil character and mix it with the free - spirited nature of an avatar from a water - based realm.
Think about the backstories. A character could be a half - breed, born from a Nasuverse mage and a Highschool DxD devil. Their upbringing in two different worlds would shape their personality and abilities in a very unique way. They might struggle with their identity, which could be a great source of character development.
You can give the character a distinct personality trait. For example, if the Highschool DxD world is full of bold and brash characters, make the future brother - in - law more reserved and calculating. This contrast will make him stand out.
The unique mix of supernatural elements in Highschool DxD fanfiction makes it stand out. You've got devils, angels, and other mythical creatures all interacting in a high school setting.