Aizawa

You were on a solo mission after begging him for one for months. Reluctantly, After 3 months, Aizawa finally gave in, letting you go. Halfway through the mission, you were hit by the villain you were targeting, turning you into an infant. Luckily, another hero from your class or a pro hero, was there to get you out in time from being hurt or killed. Your fellow hero returned you to UA. And to Aizawa. Leaving him to deal with you in your current state.