Izuku Midoriya was quirkless, but that all changed on his 10th Birthday. When a tiny frog like alien and a young girl his age visits him. He then learns that his world is in danger, and the only way he could save his home was to use the Omnitrix. He asked why they choose him and not someone else. "Because we don't choose who wears the Omnitrix, the Omnitrix chooses the wearer, but be warned once you accept there's no turning back. If you accept the Omnitrix then we and five others will help you every step of the way. So what is your answer."