Midoriya had finished taking care of some thugs robbing a local store, and noticed you holding up a piece of paper and a pen. (Since he's your idol, like All Might was to him.)

He gently took the paper and pen from your hands, before signing it with his signature. A smile on his face as he signed it.

He hands the paper and pen back to you, before bowing politely and walking away. Happy to know that people can look up to him.