First, you need to establish the character of the male OC. Decide on his personality, his background, and his goals. For example, if he's a student, his goal could be to expose the secrets of the Death Note to the world. Then, introduce Kyra in a way that makes her relevant to the male OC's story. Maybe she's a witness to a Death Note - related crime.
Another way to develop the plot is to think about the conflict. It could be an external conflict, like the male OC and Kyra being hunted by those who want to keep the Death Note a secret. Or it could be an internal conflict, such as the male OC struggling with his feelings for Kyra while also being terrified of the power of the Death Note. You can also add twists and turns, like the male OC discovers that Kyra has a hidden agenda all along.
Well, it could be a story where the male OC is a detective trying to figure out the mystery of the Death Note, and Kyra gets involved in some way. Maybe she has some secret knowledge about it.
An OC can be integrated as a new adversary for Light. For example, if the OC is a brilliant strategist with a strong sense of justice, they could start to suspect Light's actions and try to expose him. They might notice the patterns in the deaths that the police are overlooking. Another way is to make the OC a confidant of L. The OC could bring in new ideas or skills that help L in his investigation. For instance, if the OC is an expert in forensics, they could find some overlooked evidence related to the Death Note killings.
A simple plot development could start with the male OC being a unique individual with a special ability that draws Beerus' interest. For instance, the OC might have the power to manipulate time in a small way. Beerus, always on the lookout for interesting things, decides to keep the OC close. As the story progresses, the OC could face challenges related to controlling his power, and Beerus could be both a source of guidance and a cause of some of those problems.
Think about the male OC's unique abilities or traits. If he has the ability to communicate with animals, how does that play into the story? He could use this to gather information or get help in a fight. Another aspect is the relationships he forms. Does he fall in love with one of the Rosario Vampire characters? If so, how does that change the existing relationships in the story? Also, consider the setting. You can add new locations or expand on the existing ones in the Rosario Vampire world.
First, consider their backstory. A Shinigami's past can greatly influence their present behavior. For example, if they were once a human who had a tragic end, it could shape their view on death and how they interact with living beings. Second, think about their personality traits. Are they cold and calculating like most Shinigami, or do they have a softer side? Maybe they're curious about humans in a way that other Shinigami aren't. Third, their relationships with other characters matter. Do they have a rival among the Shinigami? Or perhaps a mentor? These relationships can add depth to the character.
Think about the unique abilities of your male OC. If he has a nen ability that can control time, for instance, how does this impact the story? He could accidentally get caught in a time loop during an important event in the Hunter x Hunter timeline. This creates a complex plot where he has to figure out how to break the loop while also dealing with the other challenges in the world, like the Phantom Troupe. His relationships with other characters will change as he tries to solve this mystery.
The plot might also develop around a conflict of ideologies during the interrogation. The Death Note characters might have a very different view of justice compared to the Naruto characters. For example, Light from Death Note believes in creating a new world by eliminating criminals, while Naruto believes in redemption and giving people a second chance. This clash of beliefs during the interrogation could lead to intense debates and battles, both physical and mental. It could also make the characters re - evaluate their own values and lead to unexpected alliances or betrayals as the fanfic progresses.
First, establish the OC's backstory. Are they from a broken family? Or are they an overachiever? This will shape their actions. Then, think about how they meet Spiderman. Maybe it's at school, or during a fight. Next, create conflict. For example, the OC might not trust Spiderman at first. As for the plot development, it could be that the OC gets kidnapped by one of Spiderman's enemies, and Spiderman has to rescue them. This will deepen their relationship.
A good way to develop the plot is to think about the themes you want to explore. If you want to explore the theme of friendship, the OC can start off as an outcast but through their interactions with Ranma and his friends, they learn the true meaning of friendship. Saffron can be the antagonist who tries to break this new - found friendship. The OC could also have a personal journey, like learning to overcome their fears. Their interactions with Saffron and Ranma can be the catalysts for this growth, and this can form the backbone of the fanfiction's plot.
Another theme is morality. Since the Death Note concept is morally ambiguous, the male OC's actions and decisions regarding the Death Note and Light's actions force the exploration of morality. They might question whether Light's actions are truly just or if there could be a better way to create a 'perfect world'.