A great plot for a Grand Moff Tarkin OC fanfic could involve an OC who is a former Imperial officer turned double agent. This OC has to deceive Tarkin and his inner circle to pass information to the Rebellion. The OC could use their knowledge of Tarkin's strategies and personality to their advantage. Additionally, an OC who is a journalist in the Star Wars universe, trying to expose Tarkin's tyranny. They might start by interviewing people close to Tarkin and slowly uncover the truth. And an OC who is a mechanic in Tarkin's flagship, who accidentally stumbles upon a dangerous secret and has to figure out what to do with it while avoiding Tarkin's wrath.
First, give your OC a clear backstory. For example, if they are from a certain planet, explain how that planet's culture and environment shaped them. Second, give them a motivation. It could be something like revenge against Tarkin for wronging their family, or a desire for power within the Imperial ranks. Third, give them flaws. Maybe they are too trusting or have a hot temper. This makes them more human and believable.
A mystery - themed 'the oc fanfic' would also be great. Maybe there's a mystery surrounding the Cohen family's wealth or a long - lost relative that suddenly shows up with a hidden agenda. The characters would have to work together to solve the mystery, and in the process, their relationships would be tested and new alliances formed.
One idea could be exploring an OC's (Original Character) journey to become a leader within the 100's post - apocalyptic world. They could start as an outcast and through their unique skills, like advanced medical knowledge or exceptional hunting abilities, gain the respect of different factions.
One idea could be a team of underdog mages who use unorthodox magic to surprise everyone in the Grand Magic Games. For example, a mage who can control plants in a world where most magic is elemental.
An OC could be a street artist in Ikebukuro who uses their art to tell the stories of the various gangs and groups in the area. This OC could interact with Celty as they both have an interest in the unique aspects of the city. They might start a project to document Celty's presence in a positive way, which could draw the attention of the Dollars and other factions.
One idea could be that your original character (OC) is from another planet similar to Krypton. They arrive on Earth and initially clash with Superman over different approaches to protecting the planet. But as they face a common powerful enemy, they learn to work together and combine their unique powers.
A cool plot could be an OC who has the ability to communicate with Titans in a different way than the normal Seeker. Instead of using the traditional methods, they can enter the Titans' minds and see their memories. This leads to the OC finding out about a hidden danger that threatens all of Huntik, and they have to convince the other Seekers to believe them and take action.
One idea could be an OC who has the power to manipulate time. They could accidentally get stuck in a time loop during a mission with the Incredibles and have to figure out how to break free while also helping the family stop the villain.
One idea could be an OC who has a unique alien form that is a combination of two different Ben 10 aliens. This OC could struggle with controlling its powers at first. Another plot could involve the OC coming from a different dimension where the rules of the Omnitrix are different. They then have to adapt to the Ben 10 universe while also dealing with villains who want to use their unique powers for evil.
One plot idea could be that the OC is a new student at McKinley High. They have a unique talent, like being an amazing dancer who combines different styles. The OC catches Will's attention when they perform in the school talent show. Another idea is that the OC is a music prodigy who has a different approach to teaching music compared to Will. They start collaborating on a special project for the glee club, which causes some interesting dynamics within the club. And a third idea could be that the OC has a mysterious past related to the music industry, and Will helps them face their past demons while also incorporating their experiences into the glee club's performances.