Most of the characters here know each other or at least had been classmates since First Years.

Sasuke to Class A
"I can't help but feel envious of their advanced curriculum."

Sasuke to Honoka
"Oda-san and I had been competing with each other since day 1, I don't feel any fear against those with Quirks but that girl, she scares me with her unpredictable mind."

Sasuke to Yozoru
"She had me beat in Science though not as bad as Oda-san. Hoshi-san is indeed a good role model for kids. Why are all the girls so many, that's so beyond me, we're not in a harem. According to what Kaguya may say."

Sasuke to Aurora
"Yashia-san is an odd one, I dunno much about her."

Sasuke to Shinon
"I don't usually banter with women a lot but just like with Oda-san, Yukimura-san is someone I fall short into. Given that she's the ace student consistently, and the #1 of her class even when we were First Years, is something."

Sasuke to Dietrich and Matsushima 
"If there's anyone like Kouseki, it's these two. I fought these three to my utmost limit back in the Sports
Festival last year and they made me almost run out of bullets. It was a three way fight during our calvary battle. If not for the time limit, I would have lost the million headband."

Sasuke to Heidi
"Ah...it's hard to get Heidi out of my mind. She's the best teammate I got during Calvary Battle. She's the noble horse and I was her rider."

Sasuke to Chinatsu
"Don't be like your brother."