My PC character binder has DND 2nd Ed, DND 5th Ed, Marvel superheroes, Firefly, Call of Cthulhu, Exalted by White Wolf, Star Wars WEG, and a few others. It is not exhaustive of all the characters I have created, nor the systems I have played in.
This is not inclusive of my NPC and BBEG character binders either. For evil GM purposes, moohaha.
Every single one of the characters in the PC binder, the NPC binder, and the BBEG binder all have comprehensive backstories.
This is not intended as a gamer flex, but just as an example of how some people put together characters. Including the ones that they use for their day-to-day interactions. Because I sure s*** do it.
I am neurodivergent. I suffer from PTSD, anxiety, and depression. The latter is probably a comorbidity of my anxiety and PTSD. I can generally fake being well, upbeat, and invested. It does not take away from my outstanding abilities at the things I am excellent at. It does take away from my ability to do things on a day-to-day basis.