Here's just some random facts I came up with

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Kay loves anything and everything horror, had an FNAF and creepypasta phase 

Koy owns a Mirko costume and wears it from time to time just because 

Amisho will choose Red Bull over Monster any day 

Ommi would prefer to live in the country instead of the city but doesn't want to abandon the people that need her 

Silenai once slept in Aizawa's bag when he wasn't in the room and he still doesn't know she did it 

Akari has a Pokemon collection but doesn't talk about it because she doesn't want to be seen as childish 

Hizani does like cats, she just likes dogs more 

Sabine likes to tease Natsuo just to see him turn red 

Suka calls Tanjiro Tambajoro, Nezuko Nezeeku, Mitsuri Missary, Giyu Guy-u, and Shinsobu Shitbobo, the only names she gets right are Inosuke and Zenitsu 

Kaliie has called Koro-Sensei 'Dad' once because he had told her good luck with something, and Koro-Sensei just loved it and for a week called her his daughter just to mess with her 

Tayalee (I've updated her a bit) had a crush on Bertholdt and dated him until finding out he was the colossal titan, which was the titan that killed her parents (I'll make sure to do her information next in the oc info book) 

Kerindia knows how to box and knocks Wakiya out every time he challenges her to a match

Kerindio once had a relationship with Honcho 

Kristen treats Sally and Ben Drowned like her own little siblings sometimes 

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Here's some more knowledge