Momo Yaoyorozu. She is intelligent and resourceful. She could use her Quirk to create useful items for Captain America during their adventures together. Also, Captain America could mentor her in leadership and strategy, which would be beneficial for her growth as a hero.
Midoriya Izuku. He's the main character and has a strong sense of justice, just like Captain America. They could learn a lot from each other, with Captain America teaching Midoriya about his combat experience and Midoriya showing Captain America the unique Quirks of their world.
I think Naruto and Hiro would be likely to team up. Naruto has his strong will and determination, and Hiro is really smart. Together, they could come up with great strategies in battles. Hiro could use his tech knowledge to enhance Naruto's abilities, and Naruto could teach Hiro about the importance of never giving up.
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.
All Might could be a likely candidate. He's the symbol of peace and the most powerful hero. Having a legendary Pokemon like Arceus would be fitting for his status. Arceus is considered the creator of all Pokemon, and All Might is like the top hero, so they could share a similar level of power and importance.
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.
Todoroki might be another likely character. He has a complex power set and has been through a lot of emotional and physical growth. His struggle to control his two quirks could be a parallel to the control needed for Ultra Instinct. If he can master the balance within himself, it could potentially lead to the awakening of Ultra Instinct in him.
Midoriya would be a likely candidate. He's always looking for ways to improve and become a better hero. Time travel could give him the chance to learn from past heroes directly, like All Might in his prime. He could also go back to understand more about One for All's past users and how to master the quirk faster.
Goku would be an obvious ally for Captain America. Goku is always eager to fight for justice and protect the innocent, which aligns well with Captain America's values.
Todoroki is another possibility. Given his complex backstory and his struggle with his two different powers, the mask could symbolize his journey to fully accept himself. It could be a catalyst for him to merge his fire and ice powers in a new and unexpected way, or it could hold the key to unlocking some hidden aspect of his family's past that impacts his hero identity.
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.