Authors can make the OC relatable. If the OC has common fears or desires like any normal person, readers will connect with them. For example, if the OC is afraid of being alone and the betrayal makes them isolated, readers can empathize. Additionally, the author can show the OC's struggle to overcome the betrayal. If the OC doesn't give up easily and tries to fight back or find a way to redeem themselves, it makes the reader cheer for them. This struggle shows the OC's strength in the face of adversity and makes the reader more sympathetic towards them.
The OC's backstory as a gamer is crucial. Maybe they were a bullied gamer in the human world but in the Highschool DxD world, they find a new sense of purpose and power. Their journey from being an underdog gamer to a powerful figure in the DxD world can be very memorable. Also, give them some quirks like always quoting game lines at inappropriate times which adds humor and memorability.
In some fanfictions, the OC is betrayed by the entire group they thought they belonged to. This could be a club or a team within the Highschool DxD universe. The group might turn on the OC because they see the OC as a threat to their status quo. Maybe the OC has powers that the group fears will disrupt their power balance. This kind of betrayal can lead to the OC having to find new allies or even go it alone, which can be a great opportunity for character development.
Well, for a believable OC in Highschool Dxd fanfiction, think about the world they are entering. It's full of different species and power hierarchies. Your OC should have a reason for being there. Maybe they are drawn to the school because of a prophecy they heard about. Their personality should be complex. They can't be all - good or all - bad. And their abilities should be something that is both useful and has limitations. For instance, if they can fly, maybe it only works for a short time or under certain conditions. This makes them more relatable and believable in the context of the Highschool Dxd universe.
First, think about their backstory. For example, if they are a human, what was their life like before getting involved in the 'Highschool DxD' world? Maybe they had a difficult childhood which shaped their personality. Second, give them a unique skill or trait that makes them stand out but is still believable within the context of the series. It could be something like being an expert in martial arts which helps them in combat situations.
First, give your OC a clear backstory related to the Sharingan. Maybe they got it from a mysterious ancestor or an encounter with a powerful ninja - like being. Second, define their personality traits. For example, if they are a bit of an outcast because of their Sharingan, they could be shy but also determined to prove themselves. Third, think about their goals in the Highschool Dxd world. Are they there to master their Sharingan powers? Or are they looking for a way to go back to their own world?
First, give your Neko OC a distinct personality. For example, she could be really shy but have a hidden feisty side that only comes out when she's protecting her friends. Second, give her unique physical features. Maybe she has heterochromatic eyes, one blue and one green, which is rare among Nekos. Also, a special ability like super speed or the power to heal others quickly can make her stand out. And don't forget to give her a backstory that ties into the Highschool DxD universe, like she was an experiment by a rogue devil scientist.
To create a compelling OC, consider their abilities in relation to Excalibur. Maybe they have a special power that only activates when they are in close proximity to the sword. Or they can communicate with the spirit of Excalibur. Their appearance should also be unique. It could be a mix of modern and medieval styles, like wearing a school uniform with a knight's cape. This visual aspect will make them stand out.
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.
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, come up with a really unique and interesting monster concept for your OC. For example, a monster that can control time or has the ability to merge with shadows. Then, think about how this OC will interact with the existing characters in Highschool DxD. Maybe they'll start off as an enemy to Issei but later become an ally. Also, create some exciting plot twists. Like, the OC might turn out to be related to one of the powerful beings in the series in a way no one expected.