So I accidentally started writing a James Bond-y, Zorro-y, Scarlet Pimpernel-y sort of game and I thought I'd inflict it on you. I'm now struggling to remember how it happened.
I was definitely inspired by an episode of Improvised Radio Theatre with Dice - specifically episode 26, at around 48 minutes in. There's a brief discussion of using flavour and quirks to distinguish characters.
I think that I very much like... the idea that you have things that define your character that are not just about how good you are at adventurey stuff. They are about, you're greedy, or you're fond of a drink, or you're particularly smooth with the ladies or whatever. Okay, in some games that's going to be especially relevant...