An OC can be integrated by having a relevant skill set. For example, if they are a mechanic, they could be the one who keeps the crew's cars in top - notch condition. This would make them an essential part of the team and give them a reason to be around during all the action.
The OC could be related to one of the existing characters in some way. Maybe they are a long - lost sibling or an old friend. This connection would provide a natural entry point into the story. They could also have a unique backstory that ties into the overall theme of the 'Fate of the Furious' world, like coming from a family with a history of street racing or having a past encounter with the criminal underworld that is relevant to the plot.
One way to integrate an OC is through a shared goal. Let's say there is a new threat in the 'Fate of the Furious' world that the crew and the OC both want to stop. The OC could bring in new resources or a different perspective. For instance, if the OC has connections in a different part of the world that the crew needs to access in order to defeat the enemy. This would create opportunities for the OC to interact with the characters and be an important part of the story.
Another way is to make the OC wizard an ally of the Huntsmen and Huntresses. They could assist in battles against the Grimm. For instance, the wizard could use their magic to heal the wounded or create illusions to confuse the Grimm. This would make them a valuable asset in the fight against evil in the RWBY world.
An OC can be integrated into Daemon Targaryen's world in fanfiction through various means. One way is by having the OC be from a noble family that has some connection to the Targaryens. This gives a plausible reason for their paths to cross with Daemon.
First, you need to understand the lore of the Yona of the Dawn world. The OC dragon could be introduced as a new discovery, perhaps emerging from a long - hidden place. For example, it could come from an underground cave that was sealed for centuries.
First, give the male OC a believable backstory related to his past life and how it ties into the BNHA world. For example, if he was a scientist in his past life, his knowledge could be used to develop new support items for heroes. Second, have him interact with the existing characters in a natural way. He could start as a transfer student at UA and make friends or rivals with the canon characters. Third, give him a unique quirk that both fits the BNHA universe and is related to his past - life experiences.
The OC can have pre - existing relationships with some of the minor characters in the High School DxD world. For example, they could be an old friend of a side character who then gets introduced to the main group. This way, it feels more natural for them to be part of the story.
To integrate an OC well, first, consider their personality. If the OC is a confident and brash character, they could contrast with Android 21's more complex and often reserved nature. Second, think about their goals. If the OC's goal is to find a cure for a certain disease that Android 21 might be related to in some way, it creates an instant connection and a plot thread. Third, make sure their appearance also fits the DBZ aesthetic, like having a unique fighting gi or a distinct hairstyle.
Give the OC a unique skill or trait that is relevant to the Sherlock universe. It could be something like an eidetic memory or a talent for deciphering ancient codes. This way, they can interact with Sherlock and the other characters in a meaningful way, either as an ally or an adversary.
One way is to make the Otsutsuki OC a hidden observer during the Uchiha massacre. They could be there to study the Sharingan or the power dynamics within the Uchiha clan. For example, they might be interested in how the Uchiha's emotions, like hatred, are related to the power of their eyes. Another way is to have the OC be a factor that somehow influences Itachi's decision. Maybe they offer him a different option or some knowledge that makes him rethink his actions, but in the end, the massacre still occurs due to the complex web of political and clan - related reasons in the Naruto universe.
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.
The OC could be integrated into the story by having a shared past with either Eragon or Murtagh. Maybe they grew up in the same village as Eragon but were separated when the Ra'zac attacked. Years later, they reunite and the OC can offer some unique perspective or ability to the situation. Or, if the OC has a connection to the dragons in a different way than Eragon and Murtagh. For instance, the OC might have a special bond with a dragon that was thought to be lost. This would bring them into the story as they try to protect their dragon friend and get involved in the events related to Eragon and Murtagh. Also, the OC could be a trader who has information about the movements of the enemy forces. They could trade this information to Eragon and Murtagh in exchange for protection or some other favor, thus becoming part of the story.