One common theme is the struggle of the OC fallen angel between good and evil. They often have to decide whether to follow their darker fallen angel nature or strive for redemption. Another theme can be their relationships with the other characters in the Highschool DxD universe, like forming alliances or rivalries with devils, angels, and other supernatural beings.
The theme of self - discovery can be seen as well. Characters from both series might be on a journey of self - discovery, and the addition of the Fallen Angel element can further complicate or enhance this journey. For example, a character might discover new powers or aspects of their personality due to their encounters with Fallen Angels. And of course, the theme of good vs. evil is always present, as the Fallen Angels can be seen as either a force of evil to be fought against or as complex characters with both good and bad sides that need to be navigated.
One common theme is redemption. Since the character is a fallen angel, often there's a journey towards redeeming themselves in the eyes of the other characters or a higher power. For example, they might try to atone for past sins.
A good plot for Highschool DxD fallen angel OC fanfiction could start with the OC being hunted by a group of vengeful angels. As they run, they end up in the territory of the devils and have to make a deal with them to survive. Along the way, they fall in love with a devil, which creates a whole new set of problems as their two worlds collide. Or, the OC could be trying to solve a mystery that dates back to the very beginning of their fall, something that involves a prophecy that only they can fulfill.
Well, you could make your fallen angel OC a bit of an outcast even among other fallen angels. Maybe they have a different view on the war between angels and devils. For example, they could be trying to broker peace in secret. They might also have a special connection to a certain sacred object that was lost during their fall, and the story could revolve around finding it again. Also, giving them a distinct personality trait like being overly curious about human culture could lead to some fun and unique storylines.
To create a compelling fallen angel OC in Highschool DxD fanfiction, first focus on their backstory. Maybe they were once a high - ranking angel who fell due to a disagreement with the celestial hierarchy. Give them unique powers, like the ability to manipulate shadows in a way that's different from other fallen angels in the series. Their personality should be complex, perhaps having a sense of regret for their fall but also a new - found freedom. For example, they could be cynical towards the angels they once served, but still hold some of the old values deep down.
One common theme is power struggles. Since the Bael family is known for its power in the Highschool DxD universe, fanfictions often explore how different OCs within the Bael family vie for more power, whether it's political power within the devil society or more magical and combat - related power. Another theme is loyalty. OCs might have to decide where their loyalties lie, whether it's with their family, a particular faction, or a group of friends.
One common theme is power combination. Since Naruto has his own set of ninja powers and High School DxD has its unique power system related to devils, angels etc., fanfictions often explore how these powers can be combined when the two worlds collide. Another theme could be friendship. Characters from Naruto and High School DxD might form unexpected friendships in these fan - made stories.
Another theme is identity. The OC has to figure out how being a Dragon Emperor fits into their new life in the Highschool DxD world. They might struggle with whether to embrace it fully or keep it a secret. For instance, they may worry about how their friends and foes will react to their true identity.
One great 'Highschool DxD' fallen angel fanfiction is 'The Fallen Angel's Redemption'. It offers a unique take on the fallen angels in the series, exploring their backstories more deeply. The character development is well - done, and it has some exciting plot twists.
One interesting plotline could be Issei's struggle to control his new fallen angel powers while still maintaining his relationships with his friends at school. For example, he might accidentally use his powers in public and have to cover it up.