Disclaimer:all of the students will be adults/pro heroes and the adults will still be adults, just younger (minus Hawks; he's pretty young already). Scenario: They are patrolling the streets when a young black girl runs into them. Shortly after the girl looks at them, she squeals and fangirls as she asks for a picture.
Izuku:
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He would be surprised to see that his heroism reached out to her, even though that was his intention (he's so humble). He was very aware of the hardships of the black community, which is one of the reasons he stays in America for a while every year. He would gladly give her a hug and take a picture with her. He would even ask for a picture so that he could always remember her.
Katsuki:
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He would be shocked considering a lot of people actually hated him. So he, rightfully, asked her why he was her favorite and she answered, "Because you tell it like it is and don't take shit from anyone.". He was so moved by her simple yet sweet answer that he took a selfie with him; where he would give most his initials on a paper.
Shoto
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To say he was shy would be an understatement. Poor baby has never interacted with black people despite knowing a lot about their culture and history, so for her to say he was her favorite hero made him feel more appreciated as a hero and strived to be a better one. So of course he took a picture with her.
