A darker plot idea could involve a powerful villain who has somehow found a way to corrupt both universes. This villain uses the technology and powers from both My Hero Academia and the Justice League's worlds to create a doomsday scenario. The heroes must put aside their differences and combine their strengths to stop this new threat. This would involve a lot of character development as they learn from each other's methods of heroism and sacrifice.
The fanfiction could involve power - sharing or power - swapping scenarios. Imagine if All Might had the power of Green Lantern for a while. How would he use it? Or if Wonder Woman had One For All. This would not only create interesting battle scenes but also explore the characters' personalities in new ways. Also, the different power levels in the two universes could be equalized in creative ways. For instance, the lower - powered characters in My Hero Academia could find ways to hold their own against the super - powerful Justice League members through strategy and teamwork.
A cool fanfiction idea could be a team - up between specific members of the Justice League and My Hero Academia characters. For instance, The Flash and Izuku Midoriya could compete in a race, with Izuku learning about speed and the Flash learning about the concept of 'One For All'. This would not only be an exciting story but also a great way to explore the different power dynamics and personalities of the two universes.
One way to combine them is through a crossover story. Imagine characters from My Hero Academia being transported to the Justice League's universe. For example, Deku could meet Superman and learn about a different kind of heroism. Their powers and ideologies could clash or complement each other. Another aspect could be the villains. The League of Villains could team up with some of the Justice League's foes, creating a huge threat that both groups of heroes have to face together.
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 interesting plot idea is the exchange of powers. For instance, if Batman were to somehow gain the ability to use Fairy Tail magic, it would completely change his combat and detective approach. He could use magic spells to enhance his gadgets or solve mysteries in a more magical way.
A really interesting plot idea would be if the Kyuubi's chakra somehow gets corrupted and Naruto starts to lose control. The Justice League has to help him regain his sanity and control over the Kyuubi. Also, a plot where the Justice League and Naruto with the Kyuubi team up to take on a powerful interdimensional being that is causing trouble in both their universes. They have to combine their different powers and strategies to win. And perhaps, there could be a sub - plot where Naruto tries to understand the different values and ethics of the Justice League members compared to his own ninja world.
One idea could be that the anti - heroes are forced to team up with the Justice League against a common enemy who is far more powerful and morally ambiguous than they are. This would create a lot of tension as they have to work within the League's rules while still maintaining their anti - hero ways.
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.
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.