A great plot idea is for your OC to be a time - traveler who accidentally lands in the 'Making Fiends' world. They know about future events in the show and try to change them for the better. But their actions have unforeseen consequences, like making Vendetta even more powerful or causing Charlotte to lose her kindness. Another plot could be that your OC is a spirit guide sent to help Charlotte. However, Vendetta tries to corrupt the OC and turn them against Charlotte. Or perhaps your OC is a detective - like character who is investigating the strange happenings in the 'Making Fiends' world, which leads them to discover secrets about Vendetta and Charlotte that no one else knows.
Begin by brainstorming ideas for your OC in 'Making Fiends' fanfiction. Consider their backstory, which could be something like they were an outcast in their own dimension before ending up in the 'Making Fiends' universe. For their powers or abilities, it could be something unique like the ability to communicate with inanimate objects. Then, think about the relationships they will form. Will they be enemies with Vendetta? Or become friends with Charlotte? You can also look at some existing fanfictions for inspiration, but make sure to add your own unique twist. Sketch out a rough plotline that involves your OC interacting with the main characters and changing the course of events in the 'Making Fiends' world.
A plot could be about your OC trying to infiltrate an enemy organization that is planning to take over the Kingsman agency. They have to go undercover and face many challenges along the way. Another idea is that your OC discovers a long - lost Kingsman technology that could change the balance of power in the world, and they have to protect it from falling into the wrong hands.
Your OC could be a ranger who has a vendetta against a powerful orc chieftain. The orc has been raiding villages and killing innocents. The OC sets out on a mission to hunt down the orc. Along the way, they get involved in a larger conflict between the forces of good and evil. They meet other characters from the Lord of the Rings world, like Aragorn or Legolas. This plot allows for a lot of action and character development as the OC battles their personal enemy while also contributing to the greater fight against Sauron.
One plot idea could be an OC who is a healer in King's Landing during Aemond's time. The OC could cross paths with Aemond when he is injured in a skirmish. Their relationship could start from there, with the OC initially being afraid of Aemond but gradually seeing his more complex side. Another plot could involve an OC who is a dragon rider from a far - off land. They come to Westeros and their dragon catches Aemond's attention. This could lead to a rivalry or an unexpected alliance between them. A third idea is an OC who is a noble's daughter sent to court. She is an artist and ends up painting Aemond, which stirs up a lot of emotions within him as he is not used to being the focus of such creative attention.
How about a plot where the Sith OC has a connection to one of the main RWBY villains? Maybe they are related or have a pact. They work together to bring chaos to the RWBY world, but as the story progresses, the Sith OC starts to have second thoughts. They might start to see the value in the RWBY characters' way of life and have to decide whether to continue down the Sith path or turn against their villainous ally. This would create a lot of drama and character development within the fanfiction.
One plot idea could be that your OC discovers a hidden conspiracy within Shield. They start to investigate and find out that some high - ranking agents are actually working for a secret organization. Another idea is that your OC has a special power that is needed to stop an alien invasion. The team has to protect the OC while they figure out how to use their power effectively. Or, your OC could be from a different dimension and they bring new knowledge and technology to Shield, but also face resistance from some who are afraid of change.
One plot idea could be that the teenager OC discovers a hidden power within themselves that is linked to an ancient relic in the For Honor world. Another is that they get caught in the middle of a war between two factions and have to choose a side. Or they could be on a quest to find their missing family member who has some connection to the For Honor lore.
Well, for Blue Exorcist OC fanfiction, you could have a plot where your OC is a hybrid of a human and a demon. This causes a lot of internal conflict as they struggle with their identity and are feared by both sides. They try to find a place where they can belong. Another plot idea is that your OC is a master of a new form of exorcism that is not recognized by the True Cross Order. They have to fight to get their method accepted while also using it to combat a new wave of powerful demons. And then there's the idea of your OC getting caught in the middle of a power struggle between different factions within the exorcist world, having to choose a side while trying to stay true to their own beliefs.
For an Inuyasha male OC fanfiction plot, consider this. The male OC is an artist who can paint things that come to life. He gets caught up in the chaos around the Shikon Jewel when one of his paintings accidentally becomes a powerful demon. Now he has to work with Inuyasha and the others to defeat it. Or he could be a demon slayer who has a personal vendetta against a particular type of demon that is also involved in the Shikon Jewel saga. His presence disrupts the group's dynamics at first, but they soon realize they need his skills. Another idea is that he's a messenger from another dimension who brings news of a greater threat that will affect not only the Inuyasha world but also other dimensions.
A great plot could be that the OC is on a mission to steal a valuable scroll from Killer Bee. But as they try to do so, they end up getting to know him better and fall in love instead. Or the OC could be a runaway from another village who seeks refuge in the Hidden Cloud. Killer Bee takes them under his wing and they develop feelings for each other. Also, the OC could be a journalist who wants to do a story on Killer Bee and through the interviews, love starts to grow between them.