Izuku Midoriya is a likely character. He has a strong sense of justice and is always willing to put others before himself. His determination to be a hero makes him a prime candidate for self - sacrifice. Bakugo Katsuki could also be involved. Despite his tough exterior, he has a good heart and would sacrifice for his friends and to prove himself as a true hero.
One common theme is heroism. Characters might sacrifice themselves to save others, just like real heroes do. It shows their selfless nature. Another theme could be redemption. A character who has made mistakes in the past might sacrifice themselves as a way to make up for those wrongdoings. And friendship is also a big theme. They sacrifice for their friends to protect the bond they share.
I think the students like Kaminari and Sero would be involved. Kaminari with his goofy personality might initiate some pranks, and Sero could use his tape quirk to set up some elaborate prank setups. Also, the teachers like Aizawa could be involved. He might play a prank on the students to teach them a lesson in a rather unorthodox way. Another character could be Todoroki. His rather stoic nature could be a great contrast to the chaos of a prank.
Ruby is often a central character in sacrifice - related stories. Given her leadership role and her powerful Silver - eyed Warrior abilities, she might be put in situations where she has to sacrifice something for the greater good. For example, she could sacrifice her own safety to buy time for her team to escape a dangerous situation.
Obviously, Izuku Midoriya will be the central character. His friends from U.A. High like Ochaco Uraraka and Tenya Iida are likely to be involved. They would be there to support or oppose Izuku depending on the nature of the spiral he's in. Also, All Might might play a role as Izuku's mentor, guiding him through whatever challenges the spiral presents.
Power and responsibility is a big theme. Just like in the original My Hero Academia, the self - insert characters have to learn how to use their powers (if they have new or different ones) responsibly. Also, there's often a theme of acceptance. They need to be accepted by the hero society and the other characters, and they also have to accept the new world they're in. For example, in many stories, the self - insert character may come from a different background and has to adapt to the quirks and the hero - villain dynamic of the My Hero Academia world.
Well, for a 'My Hero Academia villain self - insert fanfiction', you need to focus on character design. Decide on your villain's quirk. It should be something that reflects your character's nature and goals. Next, plan the relationships. Who are your allies? Who are your enemies among the heroes? You can also draw inspiration from existing villains in the series. And don't forget about the plot. It could be a revenge story, a power - grab story, or something more complex. Write in a way that shows your villain's perspective and makes the reader understand their actions.
In a darker take, even some of the younger students at U.A. High could die. This would be a very emotional and impactful event. It would show the harsh reality of the hero world and how not everyone is guaranteed to survive, no matter how much potential they have.
In some fanfictions, Danny's family members can be involved as well. His sister Jazz might be there to support him emotionally or to try and stop him from making a dangerous sacrifice. His parents, who are ghost hunters, could also be part of the story. Their relationship with Danny and their views on his actions can add depth to the fanfiction.
Definitely Midoriya. He's such a central figure that it's easy to imagine how hypnosis could play into his story. He could be hypnotized to doubt his own abilities or, on the flip side, be hypnotized to unlock new levels of his quirk. Ochaco Uraraka is another character who could be involved. Her zero - gravity quirk could be manipulated through hypnosis. For example, she could be hypnotized to lose control of her quirk in a dangerous situation or be made to use it in a more powerful and unexpected way.
In an Infinity War - like scenario in a fanfic, Todoroki Shoto would be highly likely to be involved. His dual - natured quirk of ice and fire gives him a wide range of abilities that could be useful against different threats. Momo Yaoyorozu would also play a key role. Her quirk allows her to create various objects, which could be essential for coming up with strategies to counter the Infinity War - like threats. Additionally, Aizawa Shota, with his Erasure quirk, could be a game - changer. He could potentially nullify the powers of some of the more dangerous villains or threats in the scenario.