Uraraka could be an interesting side character too. Her friendly and upbeat personality could bring some light - heartedness to a story that might otherwise be quite serious when focused on Tsukauchi's detective work.
You could also do a fanfiction where Tsukauchi discovers a secret ability within himself. This could completely change his role in the hero world and lead to some really interesting character development as he tries to figure out how to use this new power.
The children of Deku and Ochaco would be interesting main characters. They could inherit a combination of their parents' quirks and personalities. For example, their child might have Deku's super strength but Ochaco's bubbly and friendly nature.
Well, obviously Mandalay herself is a main character. Then there could be her fellow heroes like Tiger. Students she mentors might also be main characters, like Kota who she has a connection to in the original story.
It could be a new student at U.A. High School. Maybe someone who was a hardcore gamer in their previous life and now has to adapt their gaming skills to the hero world. They would have unique ways of approaching hero training and battles.
It's possible. If we consider the idea that the Boku no Hero Academia universe has a concept of our world's fanfiction, then some of the more tech - savvy or curious characters could potentially stumble upon it. Maybe a character like Izuku Midoriya, who is always eager to learn about heroes, might be interested in seeing how fans view the hero world in fanfiction. However, this is all in the realm of creative speculation as the original series doesn't touch on this directly.
Izuku Midoriya is one of the main characters. He is the protagonist with the quirk 'One For All'. Bakugo Katsuki is also important, being Izuku's childhood friend and rival. Ochaco Uraraka, a female character with the quirk 'Zero Gravity', is among the main characters as well.
Definitely Deku. His journey from being a quirkless boy to a powerful hero gives a lot of room for creative interpretations in crack fanfictions. Writers can come up with all sorts of wacky scenarios for him, like getting a completely new and unexpected quirk.
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.
Midoriya could be a great character to pair with Tsuyu. They both have a strong sense of justice and are very determined in their hero training. They could support each other in battles and share their experiences about growing as heroes.
Dabi could be a great character to pair with Tomura. They are both villains and their powers and personalities could create some interesting interactions. Maybe they could team up for a particularly difficult mission or have a power struggle within the League of Villains.