Stain could be considered as an anti - hero in fanfiction. His extreme views on heroes, while not entirely acceptable, could be delved into deeper. He believes that only true heroes should be recognized and is willing to take extreme measures to prove his point. A fanfiction could explore a different side of him, perhaps one where his actions are more nuanced.
A lot of anti - hero OCs have a sense of justice that is different from the mainstream heroes. They might not care about fame or public approval like the heroes do. Instead, they focus on what they think is right, which could involve breaking some laws or going against the hero establishment. Their appearance might also be more edgy or different from the clean - cut hero look. They could have a more 'street - smart' attitude rather than the polished hero demeanor.
Izuku Midoriya could be a great main character in a magic - infused fanfiction. Imagine if he discovers he has an innate magical ability on top of his One For All quirk. He could use magic to further enhance his physical abilities or develop new techniques. His determination and growth throughout the story would be even more exciting with the addition of magic.
A new character could be a family member of All Might. Maybe he has a long - lost nephew who discovers his relation to All Might and decides to follow in his footsteps, but has to overcome his own insecurities and lack of experience. Or a family member of Todoroki Shoto who has a quirk that combines both fire and ice in a unique way, and they come to help Todoroki understand and master his own dual - natured quirk better.
A character with a quirk that allows them to manipulate time on a small scale, like being able to slow down time for a few seconds in a small area. This could add a new dynamic to battles. Another could be a hero - in - training from a very different cultural background, say someone from a tribe in the Amazon with a quirk related to nature and animals. There could also be a villain whose quirk is to create illusions so real that they can even affect a person's sense of touch.
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.
The main characters could include Eri. She has a very interesting quirk and her own story of recovery. At the daycare, she could be like a big sister to the other kids. Todoroki could also be a main character. His dual - quirk nature would be fascinating for the kids to learn about. And of course, Aizawa could be a daycare supervisor. His no - nonsense attitude would keep the daycare in order, and his erasure quirk could be used in case any of the kids' quirks get out of hand.
One option is a cat named Whiskers. Whiskers has the unique quirk of being able to create illusions. It teams up with a cat named Paws, who has a super - speed quirk. Another main character could be a cat named Mittens. Mittens has a quirk that gives it the power to control water. These three cats could be the central figures in the My Hero Academia cats fanfiction. They might start out as regular cats but then discover their quirks and decide to use them for good in a world full of both cat and human heroes and villains.
First, give your OC a unique quirk that has both strengths and flaws. For example, a quirk that can control fire but has a time limit. Then, develop a backstory that explains why they become an anti - hero. Maybe they've been wronged by society or have a different view of heroism. Also, think about their relationships with other characters in the My Hero Academia world. Do they have friends among the villains or heroes? This can add depth to their character.
An interesting plot could involve an anti - hero who has a hidden agenda that is not entirely evil but also not in line with the traditional hero goals. Maybe they are trying to expose a corrupt part of the hero society from within. They could form alliances with some villains who also have a vendetta against the corrupt elements. This would create a complex web of relationships and moral dilemmas.
All Might could also be important. He might offer his wisdom and support to Izuku, sharing his experiences as a hero and how she can still be a great hero even during pregnancy. And of course, Izuku's mother would be crucial. She could provide both practical and emotional support, like cooking nutritious meals and giving her advice on motherhood.