[Aizawa respects that there is thought behind it. It's given without hesitation, so it's not his place to question it.]

Right, then, Tomura. [It's a degree of formality dropped. He could have his own way of separating the past from the present. He'd hardly even had a name in mind when the Nomu slammed his face into the dirt. Then it was Shigaraki, leader of the villain alliance. Now it was Tomura. First name, same as Eri, this was a child he was looking after.]

So you can drop the "sir" with me, got it? [He pauses, scratching the back of his neck in an idle gesture.]

I'm not your prison warden, that job's never interested me. I don't need someone calling me "sir" to stroke my ego. Aizawa is fine. Eraserhead is fine.