Thought Bakugo as a explosion boom boom bender from the fire nation and Kirishima as an earthbender in the fire nation colonies in the earth kingdom. They met there accidentally and decided to become a hunter duo :]
Deku leaves UA and becomes a vigilante. He leaves a detailed backstory of how he gained OfA from his mentor All Might in form of letters to his classmates.
Class 1-A: terrified and worried.
Meanwhile Shoto: ,,Ah dammit! My theories were almost right!''
Katsuki: ,,The fuck...? Your theory at the sports festival was that Deku is All Might's secret love child. Which doesn't really make sense. Instead, he somehow adopted him mentally."
Shoto: ,,Oh c'mon! At least I was 50% ri- Wait. How do you know about this conversation?"
Katsuki: ...
Katsuki turns around: ,,'Kay extras. Time to bring that dumb nerd back home!"