Obviously, Saiki K himself would be one of the main characters. And from My Hero Academia, Izuku Midoriya could be another main character. Their interactions would be really interesting, like Midoriya being in awe of Saiki's powers and Saiki being a bit annoyed by Midoriya's over - enthusiasm.
A 'saiki k my hero academia crossover fanfiction' might focus on how Saiki K's normal, non - heroic attitude clashes with the highly idealistic and heroic environment of My Hero Academia. For example, while the students in My Hero Academia are eager to be heroes and save the day, Saiki just wants a quiet life and might be dragged into heroics against his will. He could end up using his powers in unexpected ways to deal with the various situations in the MHA world, from school competitions to real - life villain attacks.
In a 'Ben 10 My Hero Academia Crossover Fanfiction', Ben Tennyson would be a main character. He has the Omnitrix which is full of possibilities. Another main character could be Ochaco Uraraka. Her gravity - controlling Quirk would be an interesting contrast to Ben's alien powers. They could work together in some really cool ways, like Uraraka using her Quirk to levitate Ben in a strategic way during a battle. And then there's also Tenya Iida. His speed and strict sense of justice would add another dynamic to the group. These characters would all play important roles in the story, whether it's in combat, strategizing, or just in their interactions with each other.
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.
The main character could also be a gender - bent Ochaco Uraraka. Imagine her with her cute and charming personality but in a female - dominated hero world, being courted by different male characters. Her gravity - controlling quirk would also make her a powerful and interesting character in this setup.
The main characters could also be students who are not related to the current heroes but are inspired by them. They could come from different backgrounds, like a student from a family of villains who wants to break free and become a hero. Or a character who has a very weak quirk but has an unwavering determination to prove that they can be a great hero, just like their idols from the previous generation.
Izuku Midoriya could be a main character. His determination and growth throughout the series would make him a great fit for facing kaiju. He could use his One for All quirk in creative ways to fight the huge monsters, perhaps by focusing the power into a single, super - strong punch that can knock a kaiju off its feet.
The kids themselves could be the main characters. There could be a group of them with different quirks. One might be a shy kid with a telekinesis quirk, another a bold child with a fire - based quirk. Their interactions and how they grow together at the daycare could be the focus.
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.