What type of person becomes a writer? There's no one type.
I used to be a bank teller for Sovran Bank in Virginia in the late 80s. Sovran Bank eventually became Bank of America.
Most of my traditional jobs (before I quit in 1997 to freelance FT) were in the banking, government, mortgage, and consumer credit industries.
Until I built up my freelance business, I also worked part-time jobs, including one as administrative support for Meadowlake Behavioral Health Services, an extension of Bass Baptist Hospital. I helped schedule the nurses, among other duties.
Meadowlake was a psychiatric inpatient facility. I was required to have keys with me at all times, and every single door had to be locked and unlocked each and every time you went into another wing or area.
Before I became a professional writer, I'd already lived an interesting life. I'd seen a lot of things. Some weird, some mundane, but always interesting. That type of stuff comes in handy when you're building plots or developing characters.