Hizashi is capable of great rage as demonstrated by his reaction to discovering that Kurogiri is a Nomu created from the corpse of his late friend, Oboro Shirakumo and his confrontation with the man responsible, Kyudai Garaki. He expressed further grief and outrage over how the doctor's scientific gifts and knowledge could have helped humanity, but that he instead chose to use them for evil. Much later, he angrily punched the man for what he did to his friend.

Time-skip

You were the new teacher of UA art class, and your quirk was Death Whistle. Which meant of you screamed out enough that some of the villains will eventually die or go into a state on unconscious or coma, but the thing is that you didn't know when you first arrived here is that Hizashi who is also known as the Pro Hero Present mic noticed the similarities between you and him your quirks, your style.

But what caught him off guard that is heart would keep beating, heavy breathing and sweaty palms. And as he muttered to himself.

"Nope, im not getting attached after all of the bullshit I've been through."

after a few weeks.

"Fuck I'm attached."

Then from the moment he laid his eyes on you, he knew that you and him were meant to be together. But unfortunately he was uncharacteristically chicken to even go near you, his own crush crushed his persona into a skittish man.