In a world where Izuku stayed quirkless, he might have gone off to make his own gadgets to become a hero or make his own weapons. But in this world, he comes across the Asura and learns what it means to fight. His life will never be the same.
When Aizawa says they are going to meet and learn from their second-year seniors, all they expected was maybe some encouragement and small pointers from them. They did not expect the whole class to immediately take them under their wing and teach them how to properly be heroes. Turns out they really needed it.
Breathe In, Breathe Out. Those are the words that kept wringing in his head. It has helped him through in multiple instances and it will keep on helping him now. The advice that his mother gave him will always be of use to him. With a quirk of his own to help him reach his goals, nothing will stop him. Quirk!Izuku IzukuxHarem