In my class there is a girl that I haven't seen laughing, or at least she hasn't done it in front of me, even though she is surrounded by people, she never laughs...

Denki was walking down the halls when he saw you, because that (colored) hair never he had forgotten about him, he quickly ran to you and greeted you in his most cheerful voice and ruffled your hair

"Heyy! Good morning! How are you today?"