Well, a great plot for a Now you see me oc fanfiction could be an oc who is a long - lost relative of one of the Horsemen. This oc has been secretly observing the Horsemen's shows and has developed their own unique set of skills. They then insert themselves into the Horsemen's next big plan, causing chaos at first as the Horsemen don't know whether to trust them or not. Or, an oc could be a detective - like character who is obsessed with catching the Horsemen. But as they get closer to the Horsemen, they start to question their own beliefs and end up switching sides. Also, an oc with the power to predict the future could be part of a plot where they try to prevent the Horsemen from getting into a dangerous situation that they foresee, but their actions have unexpected consequences.
One plot idea could be an original character who has a special ability related to misdirection, like being able to create false memories in the minds of the Horsemen. They could initially be an adversary, but then end up joining the team. Another idea is an oc who is a master of escape from impossible situations and is hired by a new villain to take down the Horsemen, but instead gets swayed by their cause. A third plot could involve an oc with the power to manipulate technology in ways that the Horsemen have never seen, and they either help or hinder the Horsemen's heists depending on their own motives.
Maybe an OC that is an artificial being created by a powerful wizard long ago. The OC wakes up in the present day of the Danmachi world and has to learn about the new society and dungeon while also dealing with the fact that they are different from everyone else. They could form unique relationships with the existing characters as they try to find their place.
One plot idea could be that the OC is a young mermaid who accidentally crosses into Poseidon's territory. Poseidon, initially angry, is intrigued by her courage. Another could be the OC is a mortal with a special power to control water to a small extent, and Poseidon takes an interest in mentoring the OC. Or perhaps the OC is a demigod sent on a quest by the gods, and Poseidon has to decide whether to help or hinder the OC.
One idea could be an OC who is a lightning - style user in Kumogakure and has to face a powerful enemy from another village. The OC could discover a new jutsu during the battle.
One idea could be an OC who is a lost princess from a neighboring kingdom. She stumbles into the woods while fleeing from an arranged marriage. In the woods, she meets the familiar characters like Cinderella and Little Red Riding Hood. She teams up with them to face the challenges in the woods, and along the way, she discovers her own hidden powers and a connection to the magic of the woods that no one else knew about.
Well, a cool plot for Firebender OC fanfiction might be that the OC is a Firebender with a unique ability to control blue flames. This makes them a target as others either want to use their power or are afraid of it. They could then embark on a journey to find out the origin of their special ability. Also, the story could involve the OC befriending non - benders and having to protect them from the prejudice of some benders. Or perhaps the OC discovers an ancient Firebending scroll that holds the secrets to a powerful but dangerous technique and they have to decide whether to learn it or not.
One idea could be an OC who is a loner but has a special power, like the ability to communicate with spirits. This OC could get caught up in the Clan wars and use their power to bring peace. Another could be an OC from a different land, with unique fighting styles, who comes to the Warrior Clans to learn their ways. And a third could be an OC that is a half - Clan cat, struggling to find their place within the Clans due to the prejudice they face.
An OC that is a young Force - sensitive foundling. The Mandalorian could take this child under his wing, and the story could explore how they both learn from each other. The OC might struggle with controlling their powers, and the Mandalorian would have to protect them from those who would seek to use the child's power for evil.
One idea could be an OC who is a brilliant scientist that crosses paths with Sherlock and Watson while working on a top - secret experiment. The OC's knowledge could either complement or conflict with Sherlock's methods.
One idea could be an OC who is a scientist from a modern era getting stranded in Tarzan's jungle. They could introduce new technologies or ideas to the jungle inhabitants while also learning from them. For example, they might try to set up a small communication system using basic materials found in the jungle.
One idea could be a waterbender OC who discovers a long - lost waterbending technique. This technique could be something that was forgotten over time, and their discovery of it could lead to them having to face both the excitement of mastering it and the danger of others wanting to steal it from them.