I think is nice to see that even if All Might always try to keep people at arms length, because of the weight of the secret of his quirk, we could still, from time to time, be surrendered by people, laugh, joke, and have a semi-normal free time. Same with Aizawa, even if he tries to appear like a loner, is very easy to like him once you get to know him. Well, he also needs to let you get closer, but you know what I mean.

You can see how Aizawa is going to be a great teacher by how he treats Koichi.