What are some good plot ideas for a 'bnha x oc fanfic'?

One idea could be to have characters from Boku no Hero Academia (bnha) and Demon Slayer (kny) participate in a joint training session. For example, Deku from bnha could learn some swordsmanship techniques from Tanjiro of kny. This would create an interesting dynamic as they come from different worlds with different power systems.

Perhaps the OC is a scientist who has been researching a new form of energy. This energy is actually what powers the Sekirei. The OC's research attracts the attention of a group of Sekirei. One Sekirei in particular befriends the OC to learn more about this energy. As they spend time together, the OC begins to understand the Sekirei's world better and helps them find a way to break free from the constraints of the Sekirei Plan.

One idea could be that the villains release a powerful virus that turns most of the population into mindless zombies. The heroes have to not only fight the villains but also deal with the zombie horde. Another could be an apocalyptic event that wipes out most of the world's quirks, and the remaining heroes and villains must adapt to this new powerless world.

Maybe in the 'bnha graduation fanfic', there's a competition among the students as part of the graduation. The winner gets a special internship or a chance to work with a top hero. This could lead to intense rivalries and unexpected alliances.

Maybe the Knuckle Duster has a hidden backstory that the OC discovers. The OC could be on a quest to find out more about the origin of the Knuckle Duster, which could involve delving into the history of some secret organization in the BNHA world. Along the way, they form alliances with other characters and face various challenges.

One idea could be a story where Gai and the OC meet during a difficult mission. The OC is initially skeptical of Gai's flamboyant style but gradually comes to respect his skills and positive attitude. They then form an unlikely partnership and face various challenges together, growing closer as they overcome each other's weaknesses.

One idea could be a story where Legoshi and the OC meet in an unexpected place, like a hidden part of the school. The OC could be a new student who is a bit of an outcast, and Legoshi is drawn to their unique personality. They start to bond over their shared love for a particular type of music or art.

The OC could be an artist who is inspired by Yugi's dueling style. They meet at a local art exhibition where the OC has some paintings related to dueling. Yugi is intrigued and they start talking. As time goes on, the OC becomes more involved in Yugi's dueling life, helping him design new cards and their relationship blossoms in this unique way.

I really like 'Villainous Intent: An OC's Tale'. This fanfic does a great job of integrating the OC villain into the existing BNHA world. It shows how the OC interacts with the well - known heroes and villains from the original story, and the plot twists are really exciting.

One idea could be that the OC is a new hero in training and Superboy takes them under his wing. They go on adventures together, facing off against new villains in the city.