Well, power and its consequences are a big theme. The OC might gain some sort of power in the Black Rock Shooter x OC fanfiction and then has to figure out how to use it responsibly. There's also the theme of isolation at times. The OC could feel alone in this new and strange world, similar to how some of the Black Rock Shooter characters have their own moments of solitude. And of course, the theme of good vs. evil is always there. The OC may be on the side of good, fighting against the dark forces in the story.
Some common themes include transformation. The OC may transform physically or mentally as they adapt to the world of Black Rock Shooter. Another is the theme of redemption. Maybe the OC has made mistakes in their past and is seeking to make amends in this new world. And the theme of exploration is present too. The OC is exploring a new world, getting to know new places, characters, and cultures within the Black Rock Shooter universe.
A common theme is conflict. Since they are often depicted as adversaries in the original work, fanfictions usually start with some sort of conflict between them.
Friendship or a deeper connection is also a big theme. Despite their differences, many fanfictions show them developing a bond that goes beyond their initial enmity. It could be a reluctant friendship or a more profound spiritual connection.
A common theme is friendship. Despite their differences, they form a strong bond. For example, in some fanfictions, they start off as strangers but gradually learn to trust and rely on each other.
One common theme is friendship. Despite their differences, Rin and Black Rock Shooter often form a deep bond in fanfictions. Another theme is power and its control. Since Black Rock Shooter is a very powerful character, stories may explore how Rin and her interact regarding power, like Black Rock Shooter teaching Rin to harness her own inner strength.
One common theme is friendship. The relationship between the characters in a yuri context often explores deep emotional bonds that are similar to strong friendships but with a romantic undertone.
One interesting plot could be a story where Black Rock Shooter and White Rock Shooter have to team up against a common enemy that threatens their world. Maybe an evil force is trying to corrupt the balance between their two existences.
First, you need to know the Black Rock Shooter universe well. Read the manga, watch the anime, and understand the characters, their powers, and the overall setting. Then, create a well - developed OC. Give them a unique personality, backstory, and goals. Next, think of an interesting plot. It could be something like the OC getting involved in a conflict between the main characters. Also, make sure the interactions between the OC and the existing characters are believable and engaging.
Another theme is friendship or the lack thereof. Some fanfictions explore the possibility of them becoming friends despite their differences. It shows how they could overcome their initial animosity. For example, in some stories, they find common ground in their shared experiences of being powerful entities in their world. This theme gives a more in - depth look at their characters.
One common theme is the exploration of their different personalities coming together. Black Rock Shooter is often stoic and powerful, while Rin Okumura is more passionate and impulsive in his own way. Fanfics might explore how they interact based on these traits.
One common theme is friendship. Given that both characters are quite iconic in their own ways, many fanfictions explore how they could become friends or allies. Another theme is adventure. Fans like to write about them going on exciting quests or battles together.