mitobe isn’t mute. he’s deaf, and he doesn’t like to speak because his hearing loss was rapid and pretty much complete, therefore he struggles with volume control. the reason it seems like koganei can communicate with him is because they speak to each other in sign language.
murasakibara is nonbinary. they aren’t out completely yet, but himuro knows and will bite anyone who says a bad word against them.
kuroko is allergic to cats.
aida and kiyoshi have a joint fake discord account which they use to leech money off of men to fund team outings and training camps.
izuki goes on to become a successful stand-up comedian after graduation, thanks to his (terrible) puns and lifetime of insane stories he has leftover from playing basketball at seirin.
momoi can do the ‘uwu gamer girl’ voice and uses it to get free things on the internet. she hasn’t paid for aomine’s birthday/christmas presents since she was fourteen.
kagami is an avid machine gun kelly fan.
takao can play the guitar. he only owns one - a mint green strat he saved all of his money for when he was a kid. his grandad taught him. they still play together.
midorima can’t do maths. like, at all.
kise is aro/ace.
akashi collects something really stupid and small, but he has so much of it now he can’t just stop. like bottlecaps, or stamps, or stupid little rocks.
imayoshi has a glasses prescription above +5. he just seems like his lenses need shaving when he gets new glasses because the lenses are so thick they’re a hazard to society.
kasamatsu is a regular concert-goer and the sort of mosher you should keep a ten-foot distance from.
aomine has a stick-and-poke of his teiko jersey number on his ribcage. nobody knows that it was in fact midorima who gave it to him. (this is because both of them passed out at least once during the whole ordeal and they vowed never to speak of it again).