A time - travel plot where Tsuyu and Deku are sent back to the early days of heroics. They could use their knowledge from the future to change some events, all while their relationship develops in this new and unfamiliar setting.
One idea could be Deku and Tsuyu teaming up for a special mission in a new and dangerous part of the city. They have to rely on each other's quirks to overcome various obstacles and villains. Another plot could be a story where Tsuyu helps Deku train a new aspect of his quirk that he's been struggling with. Maybe she uses her frog - like abilities to teach him about balance and agility.
One idea could be that Tsuyu and Deku are paired up for a special hero training mission in a dangerous, uncharted area. They have to rely on each other's unique quirks to survive and in the process, they develop a deeper bond. Another could be a story where Tsuyu discovers Deku's self - doubts and helps him overcome them with her calm and practical nature.
One interesting Tsuyu fanfiction could be about her training in a new and extreme environment. Maybe she's sent to a special training ground with unique challenges that test her abilities to adapt and use her quirk in different ways.
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.
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.
They can start with simple acts of kindness towards each other. For example, Deku could offer to help Tsuyu with her studies, especially in hero theory, which he's good at. Tsuyu, in turn, could share her insights on how to better use one's quirk in real - life situations. This mutual exchange of help can gradually build their connection.
Tsuyu's frog - like quirk gives her abilities like enhanced jumping and a long tongue for grabbing things. In a fanfiction, her quirk could be used to quickly rescue Deku from a dangerous situation, like pulling him out of the way of an incoming attack. Meanwhile, Deku's One For All could be used to power through tough obstacles when they're on a mission together.
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.