Scenario 1: The plot gods have decided for fun to transport My Hero Academia character Izuku Midoriya as he currently is to the world of dragon ball to become Master Roshi's student for a time, both to improve him and to see him enter the world tournament, this is before Goku ever ran into master Roshi, Izuku trains for seven years under master Roshi how does he do?
Scenario 2: Izuku trains under Popo and Kami for nine years then enters the world tournament.
Scenario 3: Izuku trains under Popo and Kami for eighteen years then enters the world tournament.
Other aspect: In all three Scenarios after the training and the tournament Izuku is sent back home, what happens? How different is he? What happens? What do the others think of the new Izuku in all three scenarios?