An interesting Mr Beast OC fanfiction could involve an OC who is a rival YouTuber at first. But then, through a series of events in a Mr Beast - style challenge, they become friends and collaborate. This would show the positive influence of Mr Beast's challenges on the YouTube community. It could also include some funny moments where the OC tries to outdo Mr Beast in the beginning but realizes his good intentions later.
An interesting OC for a Beauty and the Beast fanfiction could be a talking animal servant in the castle who has their own unique perspective on the curse. They could befriend the Beast in a way that no human has before and help him see things from a different angle. Or perhaps an OC who is a forest spirit that is drawn to the magic of the castle. This spirit could interact with both Belle and the Beast, guiding them towards true love. A third idea is an OC who is a young inventor like Belle's father. This character could bring new inventions to the castle that either help or hinder the situation with the curse.
One idea could be creating an OC that is a hybrid of two different Beast Wars species. For example, a half - Maximal, half - Predacon. This OC could struggle with identity issues as they don't fully belong to either side. Another idea is an OC with a unique power, like the ability to control plants in the Beast Wars world. This could add an interesting dynamic as they interact with the other characters and the environment.
A great plot for Beast Pirates OC fanfiction could be an OC who is a doctor with a mysterious past. The OC joins the Beast Pirates under false pretenses, claiming to be able to create a super - soldier serum using Devil Fruit powers. As they work within the group, they secretly try to find a way to cure the madness that seems to be a part of the Beast Pirates' nature. Along the way, the OC has to deal with the various power - hungry and unpredictable members of the pirates, like Jack and Queen, while also hiding their true intentions.
You could also make an OC beast that has a special connection with the Celestial Spirits. Maybe it was once a spirit itself but got transformed into a beast. This connection could lead to interesting storylines involving the Celestial Spirit World and the regular Fairy Tail world.
The OC could be a therapist who is assigned to treat Elliot. At first, Elliot is very resistant to the idea of therapy. However, the OC is persistent and gradually breaks through his walls. As they interact more, the OC starts to understand Elliot's complex mind and the world of hacking he is involved in. This leads to a romantic connection as the OC becomes a part of Elliot's world and helps him in his fight against Evil Corp.
In mr queen fanfiction, you might consider a plot where the character forms an unlikely alliance with a group of rebels. They could work together to bring about positive changes in the kingdom, like improving the rights of the common people. Another idea is to create a story that delves deeper into the character's relationship with the king, exploring their love, misunderstandings, and how they overcome difficulties together. You could also write a fanfic about the character's attempts to introduce modern art forms to the traditional court, causing a stir among the nobles.
Well, a cool fanfiction concept could be that Belle discovers a hidden part of the castle that holds the secrets of Beast's past. As she uncovers these secrets, it deepens their relationship even more. Or perhaps a story where Beast gets turned human for a short time and he has to adapt to the human world without Belle by his side at first. He then realizes how much he truly depends on her. Another interesting one would be a fanfiction where Belle's father gets lost in the enchanted forest again, and Beast and Belle have to go on a new adventure to find him.
You could write a tailed beast fanfiction where the tailed beasts are reincarnated as humans. They start to remember their past lives as tailed beasts slowly. This would lead to a lot of internal conflict as they try to figure out who they are now. They might also have to deal with the fact that they still have some of their tailed beast powers, which could attract unwanted attention from various groups in the world of the story.
A Mr. Freeze crossover with the Flash could be really cool. Imagine Mr. Freeze trying to slow down the Flash using his cold powers. The Flash, on the other hand, has to figure out a way to move fast enough in the extreme cold and also try to understand Mr. Freeze's motives for targeting him. Maybe Mr. Freeze sees the Flash's speed as a threat to his own plans related to cold experiments.
One idea could be creating an OC who has a unique power related to time manipulation. They could be from a different dimension and end up in the Avengers' world. Another idea is an OC who is a master of ancient magic and teams up with Doctor Strange within the Avengers group. Maybe an OC that is a super - intelligent android created by a villain but has a change of heart and joins the Avengers.