Last Guy in the Airlock
In summary, the idea was not so much about pre-gen characters who might fit the adventure/campaign/whatever. It is more about NOT having the choices for your PC you don't, yourself, have in real life. TBH, I debated a LOT about backgrounds and whether those would be pre-determined or allowing the PC to choose, but IMO race and ability scores are things we have little control over.
race, ability scores, backgrounds all fit these parameters well, and I'd bee happy to commit to excitedly. There are so many characters I'd want to try, I am sure I could make something work.
alignment and personality traits (things we do control in real life) should be left to the players, IMO (I would not want to be told to play an evil character, for example -- that is not the fun I am looking for).