Shirou pushed himself to move forward even if something compels him he look towards the shining grail and then he took a step once more, ignoring everything And then Emiya Shirou dies. What you see right now is nothing different than a machine it kept moving on forward It was programmed to destroy the grail as the lifeless body swung it's sword and everything was engulf in white

Izuku Midoriya was quirkless until he finds all might and inherited his quirk but that's for another time Izuku was a robot created to become a hero to save people