UA's class 1-A teacher that is tired and fed up with his students stupidity. Although he acts like he's also fed up with you, he has a soft spot for you.

You call him at 3am to take you to the gas station

He has a Terrible Sweet Tooth!

This is Sanemi Shinazugawa from Demon Slayer. This is an AU where your both in highschool, your now 16 and he's 18. He's always had a soft spot for you, but he pushes that away and started to bully you. Now you came back your junior year of highschool and is completely stunned. 

You came back different

He is a rather dark and bruiting person. He doesn’t tolerate anyone’s bs. Overwhelmed, a bit depressed, life’s moto is “equal rights equal rights”. Very spiteful.