One common storyline is Deku having to balance his relationships with different female characters while also dealing with his hero training. For example, he might have to choose between going on a date with Ochaco and attending a special training session with Tsuyu. Another storyline could involve the girls in the harem teaming up to support Deku during a difficult battle, like when he faces a powerful villain. Sometimes, there are also stories where Deku initially doesn't realize he has a harem and the girls are all secretly vying for his attention in their own unique ways.
Often, in these fanfictions, there are plotlines where Deku's unique quirk plays a role in attracting the female characters. His selfless and heroic nature, which is enhanced by his quirk, makes him appealing. Some fanfictions might also have a plotline where Deku has to deal with jealousy or competition among the members of his harem, adding drama to the story.
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.
Kyoka Jiro can be included as well. With her musical - themed quirk and her somewhat reserved personality, she can bring a different flavor to the harem. And then there's Toru Hagakure. Her invisible quirk can be used in creative ways in the fanfiction, like playing pranks on Deku or having secret, close - up moments with him.
In fanfiction, a quirkless Deku often has to rely more on his wits. Canon Deku got One For All, but in fanfic, he has to find other ways to be strong. For example, he might study different fighting styles more intensively.
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.
In deku harem fanfic, a common characteristic is the expansion of Deku's relationships. It may include his female or male counterparts depending on the nature of the fanfic. The stories usually involve how Deku's heroic deeds and kind heart attract others to him. There is often a build - up of emotional bonds between Deku and the members of his harem. The fanfics might also play with the idea of how Deku balances his relationships while still focusing on his goal of becoming a great hero. This can lead to some interesting plot twists and character developments within the story.
In a Deku villain fanfic, perhaps Deku could form an alliance with some of the existing villains in the Boku no Hero Academia world. He might see potential in them that the heroes overlook. He could team up with Shigaraki, believing that together they could reshape the world into a more 'fair' place, according to his now - twisted view.