Maybe it's a hero and a villain who get cuffed together accidentally. This could lead to some interesting character development as they start to understand each other's motives. For instance, if Todoroki was cuffed to a minor villain. Todoroki might learn more about the reasons some people turn to villainy while the villain could see that heroes aren't all bad.
Another plot could involve a group of heroes in training getting cuffed together during a practice exercise gone wrong. They have to figure out how to use their combined quirks to get free. Like if Uraraka, Iida, and Tsuyu were cuffed. Uraraka could use her zero - gravity quirk to make movement easier, Iida could provide the speed, and Tsuyu could use her long tongue for various tasks.
All Might and Shigaraki. It would be really interesting to see the symbol of peace cuffed to the main villain's apprentice. All Might could try to influence Shigaraki and show him a different path, while Shigaraki would be in a position where he has to face the hero he's been taught to hate up close.
One plot idea could be that the heroes and villains get stuck in an alternate dimension together. They have to put aside their differences to find a way out. Maybe they discover a common enemy within this new place.
One idea could be that two rival Pokemon trainers are cuffed together by a mischievous Pokemon. They have to learn to work together to escape and in the process, they discover new things about each other's training styles. For example, one trainer might be more focused on attack power while the other on defense. Through this forced cooperation, they might even combine their strategies to create a new and powerful way of battling.
One plot idea could be a villain who is secretly a double agent, working for the heroes all along. They infiltrate the villain group and gather information. Another idea is a hero who loses their quirk and has to rely on their wits and combat skills alone, like Batman in the DC universe. And a villain - hero team - up to face a greater threat that neither can handle alone.
An interesting plot could involve an anti - hero who has a hidden agenda that is not entirely evil but also not in line with the traditional hero goals. Maybe they are trying to expose a corrupt part of the hero society from within. They could form alliances with some villains who also have a vendetta against the corrupt elements. This would create a complex web of relationships and moral dilemmas.
One plot idea could be that the Saiyan OC is mistaken for a new type of villain at first. As they try to prove they're not a threat, they start to make friends and learn about heroism. Another idea is that they discover a connection between Saiyan powers and some of the hidden secrets in the MHA world. Maybe there's an ancient power source that only a Saiyan can unlock.
One idea could be a crossover where the students from Little Witch Academia visit UA High. They could participate in a joint training exercise. The witches could use their magic in creative ways during combat scenarios, while the heroes-in-training show off their quirks. It would be a fun mix of different powers and personalities.
A more relaxing plot could be a beach vacation where the characters just unwind. They could build sandcastles, have picnics, and share stories. But of course, there could be some small challenges like dealing with a sudden rainstorm or a seagull stealing their food.
A great plot idea could be Shinsou going undercover in a villain organization. Since his quirk is so useful for deception, he could infiltrate and gather intel. Or perhaps a story where Shinsou has to train a group of new students with difficult - to - control quirks. He'd have to use his own experiences and his mind - control quirk in a mentoring way. Also, a plot where Shinsou discovers a new aspect of his quirk during a life - or - death battle, which gives him an edge and changes the course of the fight.
One idea could be a mystery in the dorms. For example, strange things start happening like items going missing or strange noises at night. The students could team up to solve it, using their different quirks in the process. Another plot could be a friendly competition between the dorm floors, like a quirk - based Olympics. This would show off their abilities and also strengthen the bonds between the students.