All Might is frequently seen in these fanfictions. As Deku's mentor, he can continue to guide Deku in the future, even if in a more advisory role. His presence can also bring a sense of nostalgia and connection to Deku's past, while still being relevant to the challenges Deku faces in the future.
Uraraka is also common. Her friendship with Deku, and perhaps a budding romance in some fanfictions, can add an interesting dynamic. She could be involved in missions with Deku or be there to support him during difficult times.
Definitely Ochaco Uraraka. She has feelings for Deku in the canon story, so she's a natural fit. Then there's Jiro. Her music - based quirk and her cool attitude can be really appealing in a harem setting. Toru Hagakure, the invisible girl, also shows up a lot. Her unique quirk and her kind heart make her an interesting addition to the harem. And Nejire Hado from U.A.'s Big Three also sometimes appears in Deku harem fanfictions, adding a bit of an upperclassman allure.
One interesting plotline could be Deku facing a new, extremely powerful villain that challenges his understanding of heroism. Maybe this villain has a quirk that can nullify all other quirks, forcing Deku to rely on his wits and physical training rather than just his One For All power.
There might be a new character who is a tech - genius and uses advanced gadgets to fight crime. They don't have a traditional quirk but instead rely on their intelligence and engineering skills. This would be a fresh take on the types of characters in the story. Also, a character who has the ability to communicate with animals and enlist their help in battles could be really interesting.
One common theme is rivalry. Their long - standing competitive relationship is often explored further in fanfiction. Writers like to show how they constantly try to outdo each other in different ways. Another theme is friendship. Despite their rough start, many fanfictions focus on how they gradually become friends or at least learn to respect each other more.
Another theme is the relationship changes. His friends might react differently to him as a vampire. Some might be scared, while others might try to help him. This can lead to a lot of interesting character dynamics in the fanfiction.
Toga could be an ally. Since she has her own complex relationship with the idea of heroes and villains, she might find Deku's transformation interesting. She could provide some of her unique skills, like shape - shifting, to help Deku in his villainous plans. Additionally, Twice might also join them because of his loyalty to Toga and his own sense of being an outcast in the hero world.
It could be Deku's son or daughter. They would inherit some of his amazing quirk, but also face the pressure of living up to their father's legacy. They would have to carve their own path in the hero world.
Well, sometimes in these fanfictions, Deku's death can lead to a split in the hero community. Some might think that the way heroes operate needs to change drastically because Deku, who was seen as a symbol of hope, died. There could also be a plot where Deku's mother has to deal with the loss, and this could show a more human side of the story. And, his death might inspire a new generation of heroes who didn't know him personally but were inspired by his story to step up and fill the void he left.
It could be a group of villains working together. For example, the League of Villains might decide to kidnap Deku. They might want to use him as a bargaining chip against the heroes. Or it could be a rogue hero who has turned to the dark side. This hero might think that Deku is getting too much attention and kidnaps him to take his place in the spotlight.
Another character often paired with Mount Lady is All Might. Maybe in a 'what - if' scenario where they train together, or she has to save him at some point. Their interactions could explore different power dynamics within the My Hero Academia universe.