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.
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.
One plot idea could be an OC who is a reincarnated angel in the Highschool DxD world. The OC has to hide their true identity while trying to stop a secret group of devils from starting a war between the three factions. They could team up with Issei and his friends, but there would be constant suspicion from the devils around them.
One plot idea could be that the male OC discovers he has a rare and powerful sacred gear that everyone wants to get their hands on. This leads to him being hunted by different factions. Another idea is that he accidentally enters a secret realm within the DxD world that has been lost for centuries and has to find his way out while uncovering its secrets.
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.
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.
A plot could revolve around the Sharingan OC being a target because their Sharingan is seen as a powerful tool. Devils might want to use it for their own gain, and angels might see it as a threat. The OC then has to fight to protect themselves and their friends. Also, the OC could use their Sharingan to unlock a hidden power within Issei, which changes the power balance in the DxD world. Another idea is that the OC comes from a parallel world where the Sharingan and DxD powers are combined, and they are on a mission to bring balance to the DxD world.
One common plot idea is an angel falling in love with a devil, which goes against the norms of their respective worlds. It creates a lot of drama and tension as they try to navigate their relationship while also dealing with the expectations of their own kind.
A plot could involve the mute OC being a new transfer student in the school. Their muteness makes them an object of curiosity and some characters might initially misjudge them.
One idea could be that the OC is a new transfer student to the school and immediately catches Kuroka's attention. They start off as rivals in magic or combat skills, constantly trying to outdo each other. As time passes, they realize they have more in common than they thought and gradually fall in love.