To develop both characters, create situations where they have to make sacrifices for each other. For instance, the male OC might have to give up a chance to return to his normal human life to stay with Rias and protect her. And Rias might have to risk her position in the devil hierarchy to save the male OC from a false accusation. This way, their relationship becomes more profound and their characters grow.
For the male OC, you can start by giving him a distinct personality trait. For example, if he's really shy, it can create interesting interactions with Rias who is often more confident. This shyness could be due to his insecurities about his newfound powers or his place in the supernatural world.
There could be the other members of Rias's peerage. In some fanfictions, they might be forced to choose sides between Rias and the OC. For example, Akeno might be torn between her loyalty to Rias and her growing respect for the OC's abilities.
In 'Highschool DxD' fanfiction about Rias, her character often retains her strong - willed and noble nature. She is a powerful devil, and in fanfictions, her leadership skills and loyalty to her friends are usually emphasized.
The appeal lies in the potential for new and unique storylines. Since the OC is a creation of the author, it can bring fresh perspectives to the Highschool DxD world. For example, the OC could have abilities or a personality that no existing character has, which can lead to interesting interactions with Rias.
One great fanfiction in this category is 'A New Bond'. It delves into the relationship between an original character and Rias in a really interesting way. The story develops their connection gradually, starting from a chance encounter and evolving into a deep emotional bond. The author does a wonderful job of fitting the OC into the Highschool DxD universe, making it feel like they were always meant to be there.
Well, it would be quite an interesting relationship. Naruto's strong will and combat skills from his own world could mesh well with Rias' leadership in the Highschool DxD universe. He would likely bring a new sense of loyalty and determination to her peerage. Also, his ability to make friends easily might help him fit into the complex social structure of the DxD world.
To develop the male OC, start with his backstory. He could be from a family with a long - lost connection to some powerful time - based magic. This gives depth to his character. In terms of his personality, make him a bit of an outcast at first because of his strange power. But as the story progresses, he learns to embrace it. His relationships should also evolve. He might start off being bullied by some of the more powerful characters in the Highschool DxD world, but as he gets better at using his time - stopping ability, he gains respect and forms new friendships. You can also add some flaws to his character, like being a bit too impulsive when he sees an opportunity to use his power for good, which sometimes gets him into trouble.
One common theme could be power dynamics. Since it's a Rias - bashing fanfiction, it might explore how a human OC challenges Rias' authority or power within the Highschool DxD universe. Another theme could be the exploration of different character relationships. The human OC may interact with other characters in ways that contrast with how Rias does, leading to new and interesting story developments. It could also deal with the concept of loyalty, as the OC might sway the loyalty of characters who were previously on Rias' side.
Often, there's a theme of challenging the status quo that Rias represents. In the original, she has a certain position and set of relationships. Fanfictions might bash her to create a new narrative where the OC can break free from the typical Rias - centric storylines. For example, if Rias is seen as too controlling in the original, the fanfic could have the OC resist her authority and form new alliances or ways of doing things.
The human OC can be developed by giving them unique abilities. For instance, they could have a special power that Rias doesn't have or understand. This would make them stand out and be a threat to Rias. Another way is through their backstory. A tragic or interesting backstory can make the readers sympathize with the OC and understand their motives for bashing Rias.
First, define the appearance of the Vritra Gear. Is it a piece of jewelry, a weapon, or something else? For example, it could be a gauntlet that gives the OC special powers. Then, think about how the OC got the gear. Was it inherited, or did they find it by accident?