One idea could be exploring new quirks that emerge in the future. For example, a quirk that allows the user to manipulate time on a small scale, which could add a whole new dynamic to battles and relationships. Another could be about the next generation of heroes facing a new, more powerful villain that the current heroes have unknowingly set the stage for. Maybe a villain who has found a way to nullify all existing quirks.
Well, perhaps the fanfiction could focus on how the technology in the 'boku no hero academia' world evolves in the future. Like, they develop suits or gadgets that enhance quirks in ways never seen before. And there could be a plot where a character from the past is brought to the future and has to adapt to all these changes, while also teaching the future heroes about the values and experiences from their own time.
A possible plot in this fanfiction could be the exploration of the social and political changes in the hero society in the future. The story might show how the balance of power between heroes, villains, and the general public has shifted. There could be a situation where the heroes are no longer as trusted as they once were, and they have to work hard to regain that trust. This could lead to internal conflicts within the hero community as they try to figure out how to adapt to this new situation.
One idea could be exploring Tomura's past in more detail. Maybe show his childhood before he became a villain, how he was influenced by All For One. Another could be a story where Tomura tries to redeem himself, which would be a huge twist from his normal villain role.
One idea could be a crossover with 'One Piece'. The heroes from 'boku no hero academia' could end up on the Grand Line and have to deal with pirates while also using their quirks. Another is a crossover with 'Naruto'. Maybe the students of UA could train with the ninja in Konoha, learning new skills and sharing their quirk knowledge. A third could be a crossover with 'Attack on Titan', where the heroes have to face the Titans and figure out how to use their quirks to defeat these huge threats.
In a 'boku no hero academia the gamer fanfiction', the main character could be a transfer student who has a gamer - inspired quirk. They could use this quirk to create strategic plans for hero battles. For instance, they can map out the battlefield in their mind like a game level. They might also be able to recruit other heroes by offering them in - game - like rewards. This would create a whole new dynamic in the relationships between heroes. Additionally, they could use their knowledge of gaming glitches to find weaknesses in villains' defenses.
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.
A cool fanfiction concept could be to have a character lose their quirk and then have to find a new way to be a hero. This would show their determination and resourcefulness. Or, you could write about a new villain who has a quirk that specifically targets the heroes' weaknesses, and how the heroes would have to work together to overcome this threat.
A plot could revolve around Itsuka Kendo forming an unexpected alliance with a villain. Maybe she realizes that the villain has some redeeming qualities or is being forced into their actions. This would put her in a moral dilemma as she tries to figure out how to handle the situation while still being a hero.
One idea could be that Naruto characters are transported to the My Hero Academia world and have to adapt to the different power system. For example, Naruto might be confused by the concept of Quirks at first but then find similarities to chakra. Another could be a training session where Deku and Naruto train together, with Naruto teaching Deku about his never - give - up attitude.
A more complex plot could be that the OC reincarnates into a world where the events of 'boku no hero academia' have taken a different turn. Maybe All Might was defeated much earlier and the villains are in almost complete control. The OC has to find a way to gather the remaining heroes, train them in new ways, and inspire hope again. This would involve a lot of character development as the OC has to prove themselves to the jaded heroes and also face the very powerful villains.
Perhaps Izuku is investigating a series of disappearances in the hero community. He has to interview various heroes and villains alike to piece together the clues. He could face many challenges and even some threats along the way, but his determination to solve the case keeps him going.
Perhaps a story where the next generation has to deal with a public that is growing distrustful of heroes again, like in the early days of hero society in the original series. They'd have to work hard to regain the public's trust while also fighting villains.