I’ve been hanging on, for at least 15 years, to this idea for a hard-boiled noir murder drama set in Silicon Valley in the dot-com days. It would be called “The Net Net” and it would feature a host of grifters making money by selling various vices (fast cars, drugs, the promise of eternal youth, expensive cheese, real estate) to paper millionaires.
Related to the personality step, we use a similar exercise based on research from the Nielsen Norman Group. It’s specifically for Tone of Voice, but there’s some crossover for sure.
I wrote a short article about it that includes the exercises we created to simplify the process: