While Izuku is the protagonist, "That’s the idea" applies equally to Ochaco’s growth. Initially, her motivation is purely financial—to support her parents. While noble, she often felt her "practical" goals were less heroic than the grand ideals of her classmates.
However, by watching Izuku’s self-sacrificing nature, she realizes that her desire to provide comfort and stability is its own form of heroism. She evolves from "the girl who wants to help her family" to "the hero who protects the heroes." Her "idea" becomes the emotional backbone of the U.A. students. The Weight of "The Idea" That’s the Idea, Ochaco
Ochaco’s ultimate realization is that a hero’s job isn't just to punch villains, but to see the humanity in the people society has discarded. When she stands on the roof of U.A. to defend Izuku to a fearful public, she is executing the ultimate "idea": that heroes and civilians must protect each other. Conclusion While Izuku is the protagonist, "That’s the idea"