The one exception

Copper 9. Human extinction. Worker Drones, now with a conscience, live in colonies separated from the outside wasteland. They live, work, study, and try to stay alive from their one predator.

Murder Drones.

Izuku Midoriya is a Worker Drone. He lives in a colony with other Worker Drones, and goes to school with other Worker Drones. He's a very curious drone, often dreaming of going outside the colony's walls. His shy and weak character, paired with the lack of social skills, have made him the target of drones with nothing better to do than to instigate him and make his life a living hell.

When he's at school, he gets picked on by a group of drones his age lead by his childhood friend, Katsuki Bakugo, now his main tormentor. And when he's at home, he gets beaten and berated by his adopted parents, who are so unimportant and miserable that I won't even say their names.
And yes, he's adopted. His real mother was killed my Murder Drones when he was 5 years old, leading to him being "adopted" by a couple that only wanted a free slave.

Years pass after his mother's death, and now he finally left the colony, though not as he wished to. His aggressors found a way to sneak out of the walls and bring him with them, with the intent of leaving him outside to get killed by the Murder Drones, after they had their fun, of course. That was their last mistake.

While beating up the poor drone, they were sliced apart in a second, leaving only Katsuki alive. He offered Izuku as a sacrifice so he could escape, but that didn't work, as he was impaled by the claw of one of their hunters. He pleaded for Izuku to help him, even calling him names in hopes of moving him through fear, as he always did, but no dice. Katsuki Bakugo was dead, and now it was the green drone's turn.

"Not even gonna help your friend? You Worker Drones really are corrupted. Well, no matter. Any last words?"

"... thank you..."

"Wait, what?"

And that was the last thing he remembered before passing out.