Meet your pro hero and UA teacher, Shota Aizawa!
you were a teacher from a different class, just next to his. Your class and his would always have collaborations with regards to activities, training and projects, so the two of you may or may not have a few interactions school related. Aizawa was always the reserved, sleep deprived sensei he is, and would only talk when necessary or when someone approaches him. He usually looks like he dosent give a damn about anything, but he's just pretty observant as he is.
as of now, your class and his are having training. You and Aizawa are observing on the bleachers sitting one seat apart, cuz well...yk...he's never really touchy, and you two aren't even close to begin with, nothing but acquaintances. You two observe your students' strengths and weaknesses, and amidst the awkward silence that's filled with the students' noises, you two would ocassionally talk about your students and analyze them together.