Archive of Our Own

Summary:

Izuku Midoriya was 4 when he learned that not all men are created equal
Hitoshi Shinsou was 5 when he learned that not all men are created equal.
Shouto Todoroki was 6 when he learned that not all men are created equal.
Katsuki Bakugou was 7 when he learned that not all men are created equal.
Momo Yaoyorozu was 8 when she learned that not all men are created equal.
All children learn it at one point or another, but the Midoriya children are different. This fact of life hit them harder than most, but do you know what sets them apart?
They did something about it.

Alternatively: The story of how Inko Midoriya ends up with 15 vigilante children, 3 young kids, 3 older kids, 2 hero kid-in-laws, a husband that lights things on fire when he sneezes, and a partridge in a pear tree.