All Might could be an interesting choice. He has been a major influence on Izuku, and if he were his father, it would add a whole new layer to their relationship. It could explain why All Might took such a special interest in Izuku from the start.
A character from the League of Villains, like Shigaraki's father figure, could also be a candidate. This would create a great deal of conflict for Izuku, having to come to terms with his father's villainous past or associations. It would be a great way to explore themes of redemption and family.
Perhaps Izuku's father is a scientist who was working on a top - secret project related to quirks. He might have accidentally given Izuku his quirk through an experiment. This could lead to a story where Izuku discovers the truth about his quirk and his father's role in it, while also dealing with the ethical implications of such an origin for his powers.
Bakugo is often paired with Izuku. Their complex relationship can add a lot of drama to the detective story. Bakugo might be reluctantly helping Izuku or even be a suspect in the case Izuku is investigating.
One great 'Boku no Hero Academia Izuku' fanfic could be one where Izuku discovers a new, hidden quirk within himself that's not related to One For All. This could lead to him having to train in a completely different way and form new relationships with his classmates as they all try to figure out this new aspect of his powers.
Obviously, Izuku Midoriya is the central character. Then there are often characters like Ochaco Uraraka, who could be part of the harem as she has shown an interest in Izuku in the original series. Tsuyu Asui might also be included as she is a close friend and could potentially develop deeper feelings for Izuku in fanfiction.
In fanfictions, Mina Ashido might be in Izuku's harem. Her energetic and fun - loving personality could add a lot of color to the harem. Jirou Kyoka could also be a potential member. Her musical quirk and her somewhat reserved nature could create an interesting contrast with Izuku. And then there's Toru Hagakure. Her invisible quirk and her friendly personality could make her a unique addition to Izuku's group of love interests.
One popular Izuku -injured fanfiction is 'Recovery Road'. It focuses on Izuku's physical and mental recovery after a major battle injury. The story delves deep into his relationships with his classmates and how they support him during this tough time.
Well, in many of these fanfictions, Izuku's injuries show his vulnerability. This makes him more relatable as a character. We see that even though he has great power, he's still human and can be hurt. It adds depth to his character.
Izuku is often shy and self - doubting, while Nejire is outgoing. In fanfiction, Nejire can bring Izuku out of his shell. For example, she might drag him to social events at school. Izuku, in turn, can ground Nejire with his practical thinking when she gets too carried away.
There are also fanfictions where Izuku's quirk has a hidden aspect. Maybe his connection to One For All unlocks memories or abilities from the previous users in a more profound way. For instance, he might be able to access the combat knowledge of the past users directly, almost like having an in - built combat instructor guiding his every move.
One common theme is empowerment. Since female Izuku is often in a male - dominated world of heroes, these fanfictions usually show her rising above the challenges and proving herself. For example, she might have to face discrimination from some of the male characters at first but then shows them what she's made of.