Void can't be Filled

The Knight, the one who saved Hallownest, he saved them all from the coming corruption by sealing the Radiance. He was slowly corroding as time goes on. He decided to give up his life and give everything he has to someone else. The Void would always find a suitable host as it found one that was in a close state to him.

Izuku Midoriya, a 14 year old boy with a dream of being a hero, was met with reality when All Might couldn't give him the answer he wanted. All Might told him that he can't be a quirkless hero as it would seem impossible. After he left Izuku was left into a state of both disbelief and depression as he slowly and slowly lost what it felt to feel.

They both merged but with a price to pay as it is a curse that would be broken in the future. If Izuku can't become a Hero then how about he become a Vigilante?