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.
The mischievous Mineta is bound to be involved in prank fanfiction. His pervy nature could lead to some pranks that backfire on him in a humorous way. Then there's Tsuyu. She could be involved either as a prank - setter or as someone who tries to stop the pranks in her own calm way. Also, Iida might be involved. His strict and by - the - book personality could make him an easy target for some well - meaning but still funny pranks.
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.
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.
Definitely Todoroki. His ice and fire powers could be used in different ways against Godzilla. He could try to freeze parts of Godzilla to immobilize it or use his fire to counter any heat - based attacks Godzilla might have. Also, Recovery Girl could be involved in an interesting way. After any battles with Godzilla, she would be needed to heal the injured heroes, and she might also come up with some unique medical strategies based on Godzilla's physiology if she could study it.
Definitely Deku. His determination and continuous growth would make him stand out in college. He'd probably be at the top of his classes, always eager to learn more about quirks and heroics. Bakugo would also shine. His powerful quirk and competitive nature would lead to some intense rivalries and great character development in a college environment. And Todoroki, with his complex family background and dual - natured quirk, would have a lot of room for exploration in college as he tries to further master his powers and come to terms with his past.
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.
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.
Todoroki is also a popular choice. His complex backstory and powerful quirk make him an interesting candidate for quirk swaps. Swapping his quirk with someone like Momo, who has a creation quirk, could lead to really unique storylines.
Izuku Midoriya is a likely candidate. His strong sense of justice and his journey to become the greatest hero make him a prime character for time - travel scenarios. He might travel back in time to gain more knowledge or to prevent certain tragedies. Another one could be All Might. His past is full of secrets and his influence on the hero world is huge. Time travel could be used to explore more of his backstory or to change some crucial events in his past.
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.
All Might could be a likely candidate. He's the symbol of peace in the My Hero Academia world and has a strong sense of justice. If he were to get the Infinity Gauntlet, he would probably use it to protect the world and keep the balance between heroes and villains. His already incredible strength combined with the power of the Infinity Gauntlet would make him nearly unstoppable.