Oh boy....
Celeste - After she graduated she went on to work around as a doctor for many years then starting two of her own companies in France (Tailoring and Medical) retiring in Karakura as a Caretaker, where she is now.
Kyouya - Still need to work on his lore.... sob
Lekio - He studied engineering in multiple forms in college, probably going on in his life to . . .
Ji-Jae - I have two things in mind.
A) She never graduated and went on to be an arsonist. Simple!
B) She graduated law school at the top of her class and became a lawyer or judge being unable to forget her past.
Chiara - She will go on to either follow in her mothers' legacy of being a lawyer to keep the family name, or she would keep rebelling and A) drop out of school or B) become a black market dealer, there is other outcomes that are unknown.
Oscar - He won't make it past his twenties.
Emer - She doesn't know what she wants to do in life and is currently only working on her music career, potentially becoming a hospital worker or KPD officer based on where her life heads
Yeah