One common plotline could be the OC being a new addition to Toman and catching Sano Manjiro's eye. Maybe they start off as friends, helping each other out in gang fights or dealing with the problems within the gang world. Another could be a more romantic plot where the OC has some sort of special ability or knowledge that Manjiro finds fascinating, leading to a deeper connection between them.
Involve the OC in the world of Sano Manjiro in a natural way. Don't just have her appear out of nowhere. For instance, if she's a new student at their school, show how she gradually gets to know the members of Toman. Let her have her own relationships with other characters besides Manjiro. This way, she becomes a more integral part of the story and seems more believable.
One common plotline is the OC joining Nick in his detective work. They solve mysteries together around Zootopia, facing various obstacles and villains along the way.
Some stories might have a plotline where the oc is a foreign ninja visiting the village. Shikamaru is assigned to show her around, and they start to bond over their different views on ninja life. In other cases, the oc could be a healer who often takes care of Shikamaru after his missions. Their interactions during his recovery lead to a deeper connection. There are also plotlines where the oc challenges Shikamaru intellectually, which he really enjoys, and this mutual respect forms the basis of their romantic relationship.
One common plotline is the OC being a new student at the DWMA (Death Weapon Meister Academy). Blair then takes an interest in this new and unique character. They might start off as strangers, but as the story progresses, they form a bond. For instance, the OC could be targeted by an evil force, and Blair decides to protect them.
One common plotline is the OC being drawn into Tom Riddle's world against her will. Maybe she stumbles upon his secrets and he then becomes possessive to keep her quiet. Another is a more romantic - yet still possessive - relationship where Riddle sees the OC as his and tries to isolate her from others. A third could be the OC initially being charmed by Riddle's charisma, not realizing his possessive nature until it's too late.
One common plotline is the OC being a new student in Forks and catching the attention of the Cullens or the werewolves. For example, the OC might have a special power that draws them into the supernatural world of Twilight.
Well, a typical plotline might involve the OC's confusion upon reincarnation as Loki. They could find themselves in the middle of Asgardian politics, not understanding all the rules and power plays. Some stories may have the OC using their modern - world knowledge to outwit Loki's foes. And then there's the emotional side, like dealing with Loki's complex relationships, such as with Odin. The OC might try to mend those broken relationships in a different way than Loki would have.
One popular plotline is the OC joining Whitebeard's crew. They might start as an outsider but gradually earn the respect of the crew through their skills or unique personality. Another is a love story between the OC and Whitebeard, which can be a complex relationship considering Whitebeard's status.
One possible plotline could be Ironhide discovering the abused OC and becoming their protector. He might use his strength and loyalty to keep the OC safe from their abuser.
Perhaps the OC was banished due to a misunderstanding related to a powerful and dangerous jutsu they were developing. The story could then follow the OC as they try to perfect this jutsu in exile, while also dealing with the threats that come with it. They might be hunted by various groups who fear the power of the jutsu. At the same time, they could have flashbacks to their time in the village, and their relationships with the other characters, which could add depth to their character development.