Well, you could have an MHA OC who is a villain - turned - hero. Their backstory could involve being mistreated and turning to villainy, but then being inspired by the heroes to change their ways. Maybe they have a quirk that involves shadow manipulation, which they used for evil before but now use for good. Or an OC that is a tech - genius and creates their own high - tech hero gear, much like Mei Hatsume but with their own unique style. Also, an OC with a healing quirk could be interesting, especially if they have to deal with the moral dilemma of whether to heal villains or not.
Sure. 'The Gamer Hero: Rising in UA' is a great one. It features an original character who is a gamer and uses their gaming skills in the MHA world in unique ways. Another is 'OC Gamer's Adventure in My Hero Academia'. It has an interesting plot where the OC gamer has to overcome various challenges in the hero school while also dealing with their in - game abilities in the real world of heroes.
One idea could be to have the MHA characters get stranded on Skull Island. They would have to face the various dangerous creatures there while also dealing with their own internal struggles. For example, Deku could try to protect his classmates from the dinosaurs, all while trying to control his newfound powers in this strange and dangerous environment.
A possible idea for a MHA RWBY crossover fanfic is to explore the idea of semblance and Quirk evolution. The characters from both shows could train together and discover new ways to enhance their abilities. For instance, Izuku Midoriya could learn from Ruby about using her Crescent Rose in combat and in turn, show her how to better control her power flow. The cultural differences between the two worlds could also add depth to the story, like how the heroes in MHA are more publicly recognized compared to RWBY, and how the characters react to this disparity.
One idea could be an OC who is a transfer student to Beacon Academy. They could have a unique weapon and fighting style, like a sword that can split into two daggers for close - combat. Another idea is an OC from a different kingdom with a special Semblance related to nature, such as being able to control plants. A third idea might be an OC who is an outcast in their own village because of their strange Semblance, and they come to Beacon to find a place where they belong.
An OC could be a time - traveling fan of Kakashi. They come from a future where Kakashi is a legend. The OC tries to change certain events in Kakashi's past to make his life easier, but in doing so, they create unforeseen consequences. This could lead to an interesting dynamic where Kakashi has to figure out what this strange person is doing and why.
One idea could be creating an OC who is a long - lost relative of one of the main characters in Ravenswood. This OC could come to town with a mysterious past and a special power that is somehow related to the town's secrets.
Well, a great Kamui OC fanfic could focus on a love story. Suppose an OC, a kind - hearted healer, falls in love with Kamui. Their relationship would be full of challenges, like Kamui's dangerous missions getting in the way. Or you could do a time - travel fanfic. Kamui travels back in time and meets an OC who is a key figure in an ancient prophecy related to his powers. This could lead to all sorts of adventures and revelations.
One idea could be creating an OC who is a young artist that moves into the haunted house. Their creative energy starts to interact in strange ways with the Beetlejuice world. Another could be an OC that is a ghost from a different era, like the Victorian age, and how they interact with Beetlejuice and the other spooky characters. A third idea is an OC who is a magical creature, like a faerie, that gets stuck in the Beetlejuice realm and has to find a way to get home.
One idea could be a gerudo oc who is on a quest to find a long - lost artifact that has significance to her tribe. Another could be about a gerudo oc who befriends a character from a different race and they have to overcome cultural differences. Or perhaps a gerudo oc who is training to become a great warrior and faces various challenges during her training.
One idea could be an OC who is a new animator at the studio. They start to notice strange things about the characters that seem to have a life of their own. For example, they see Bendy moving on his own when no one is operating the machinery. This OC could then try to uncover the mystery behind the studio's dark secrets.