A third plot idea is that the reincarnated character is reborn as a minor villain in the story. However, they don't want to be evil. So they have to find a way to break free from the villain group they are a part of and convince the heroes that they can be a force for good. This could involve a lot of sneaking around and secret meetings with the heroes.
Another plot could be that the reincarnated person has a unique quirk from their past life that is very different from the quirks in the My Hero Academia universe. This could lead to them being both feared and respected. They might have to go through a lot of training to control it and prove that they are on the side of good.
One idea could be reincarnating as a minor villain and trying to reform. For example, using knowledge of the future to avoid getting caught up in big evil plans. Another could be reincarnating as a quirkless student but finding a unique way to be a hero, like developing amazing combat skills without a quirk. Maybe reincarnating as a side character and becoming the mentor to the main heroes, guiding them with knowledge from the original story.
Another plot could be reincarnating as a student in a different class than the main characters. The protagonist then has to work hard to prove themselves and make their own mark in the hero school, while also interacting with the well - known characters in new and unexpected ways. For example, they might form an alliance with a character who was originally an antagonist in the series.
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 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.
Maybe a vampire villain who is trying to turn the heroes into vampires to create an army. The heroes have to figure out how to defeat this villain without getting bitten. They could use their quirks in creative ways, like using a fire - based quirk to repel the vampires.
A fun plot might be a chibi - sized adventure where the heroes get shrunk by accident and have to navigate through a regular - sized city. They would face challenges like crossing the street without getting stepped on, and trying to communicate with normal - sized people. This could lead to some really hilarious and heartwarming interactions.
A plot idea could be that a new, experimental quirk - erasing drug has a side effect of deaging those it comes into contact with. The deaged heroes then have to find a way to reverse the process before a major villain attack. They might struggle with things like not being able to use their quirks as effectively or having to rely on their pre - training instincts. Also, the relationships between the characters could be explored in a new light. For instance, Bakugo might have to learn to be more patient with a deaged Deku, which could lead to character growth for both of them.
You could write a fanfiction where one of the Illegals discovers a new power or ability that has the potential to change the balance in the underground world. This could lead to other groups either trying to recruit them or eliminate them. And as they navigate this newfound power, they also have to deal with their relationships within their own Illegals group and how it affects their dynamic.
One idea could be creating a new hero with a unique quirk that challenges the existing power dynamics in the My Hero Academia world. For example, a quirk that can nullify other quirks temporarily.