Izuku manages to consistently use One for All at 100%, without breaking himself, half way through his second year. He graduates with that power tightly regulated, completely under his control; his quirk is his, completely. The graduated class 3A have a word for it when Izuku - Deku - goes 100%. It's a physical sensation, they learned early; a pressure in the air and on their lungs and down to their bones and blood. Everyone within his vicinity can feel it. They call it going green. And then, in a fight against the villain Jupiter, Deku goes green for the first time since UA. One third of the people at the scene collapse to their knees.

“Oi, Deku!” Bakugou shouted, eyes meeting startled green. “How often do fucking heroes contact students for internships?” Deku looked startled, floundering a tad under the attention. “I- uh- never?” “Huh,” Bakugou said, reading over the letter again. “What?” Kirishima gaped. “Did a hero mail you a letter?” Bakugou rolled his eyes. “Fuck no. I think that bitch Miruko-whatever sent me a fucking death threat and her number.”