Class 1-B Headcanons
All the Class 1-B kids are on first name terms due to the majority of them being very close friends with each other... all while most of the Class 1-A kids are still on last name terms.
Hiryu is one of the smartest kids in the class - if not, the smartest - and he has the best grades, a lot of the students actually come to him for help on their homeworks and study notes.
Pony actually writes a shit-ton of fanfiction. She even began writing some about her own classmates without their knowledge.
Ibara is a genuinely nice girl but there are times when Yosetsu absolutely can not stand her. She always tells him to stop swearing for no other reason other than "it is sinful" and Yosetsu will just snap at her, saying "shut your bitch ass up. I'm not listening to some self righteous twat who queefs out bullshit after bullshit from that crusty snatch, you salted slug!"
Itsuka had to ban a few people from the kitchen who are completely irresponsible. Togaru because he tried using his blades to cut up food, only to cut through the counter; Tetsutetsu because nobody could forget what he said after Class B planned and cancelled a barbecue; Sen because he has no idea what to do when he's on his own and usually sets things on fire, and lastly Setsuna because she pranks people by letting her arm fall off when using a knife.
Sen is a rich kid and he usually asked his maid to make him food but now that he's in the dorms, he needs a lot of help with cooking and Hiryu is always willing to come and help him.
Tetsutetsu and Yosetsu usually play fighting games like Mortal Kombat and such in the living room and their own rooms. But once in Yosetsu's dorm, Yosetsu kicked Tetsutetsu's ass so badly that Tetsutetsu punched a hole in the floor and all Yosetsu could do was cover it with a carpet while waiting for someone to come fix it... but Yosetsu actually forgot about it to due to getting used to avoiding it until Momo came over one day and her foot went straight through the floor and broke her ankle. Yosetsu ended up fixing it himself and he took care of Momo as an apology.
Hiryu is one of the most wholesome people in Class B and he's very understanding to others. He offers tea to his classmates when they come to him for advice but he struggles with keeping secrets and he sucks at lying. He especially hates it when people lie to him.
Jurota has multiple dog like traits and he always fetches after balls and sticks people throw for him for fun. It's one of his favourite things to do with Setsuna and Kosei.
Speaking of Jurota having dog like traits, Hiryu has multiple cat like traits. He will drop everything when someone uses a laser point and will senselessly chase the red dot he sees. He'll sometimes even sit on the counter or the table for no reason.
Togaru might be angry 24/7 but the one person that nobody wants to get angry is Hiryu. Hiryu is absolutely terrifying when he's angry and the class saw this first hand when Neito accidentally broke a family vase in Hiryu's home. The class made a rule to never make Hiryu mad.
Kosei is the best cook if anyone wants a full meal or even just a snack, he will stop whatever he's doing and get started on making a plate for any of his friends.
Setsuna and Tetsutetsu grew up in Saitama prefecture together and they were practically like siblings. People have actually asked if they were dating and the duo's response to that was throwing up.
Everyone is 100% down to defending Nirengeki when someone judges him for his weight. They understand that its because of his thyroid problems but they have to keep Reiko from using her quirk to throw a piano at judgemental people. They can't help it, especially when Nirengeki can easily deck those assholes himself.
Shihai enjoys pranking his classmates for no reason and he always gives Yosetsu jumpscares, which results in the headband boi punching him in the face. This has resulted in Shihai and Yosetsu hating each other with a passion.
Juzo actually has a crush on Sen but he knows that he doesn't have a chance considering how committed Sen is to Hiryu. Juzo just pines from afar and suffers in heartache.
Manga and Kojiro usually accompany each other when they leave the dorms. Manga always goes to buy toys and drawing supplies that he then gives to children in orphanages. After the children saw Kojiro for the first time, they thought he was a living statue from a playground and they asked to play with him.
Reiko and Hiryu are pretty chill friends and they enjoy the spooky things, especially since both have based their hero costumes around an urban monster. Sometimes they watch horror movies together and read through creepypastas while Nirengeki and Sen try not to freak out when they see jumpscares in the movies.
Yui has a lot of plants in her rooms because they don't force her out of her comfort zone compared to whenever she gets into social situations.
Since Kinoko is a fan of idols, everybody pitched in to buy her a karaoke machine for her birthday. She cried so many tears of joy and hugged all of her classmates.
Nirengeki usually has to make sure Reiko goes to sleep because she normally does late night readings of creepypastas with a cup of coffee. He has slept over in her room to make sure that she isn't doing that every night.
Neito is flamboyant and he's always in denial that he cares for his classmates. He doesn't know that all of them know that he really does because Shihai snuck into his dorm and showed his diary to the class.
@anxiouslyangsty13, @king-switch and @booberry-shodeiko