Designing characters who want to come out to play (and cry and complain, solve murders, etc.) in your stories

Been reading about writing. the books by the guys are different, of course, from the books by the girls. One of the boys writes about how to write the best *** novels, mystery books, detective books, etc. He tells us to draw up the characters before we begin. Write a page or two about them in 3 parts (and this part I like, and I paraphrase) - 1)the physical description, 2)the social upbringing and setting, and 3)the emotional or mental way of looking at life and coping. These are things to take in to account for any character. But, I'd heard of the way I like best (from off the side before, from my peripheral reading) but in the writing book by Anne Lamott, bird by bird, she tells it directly. Let the character unfold as you would get to know a person in real life. Now, I know I need to know a bit, maybe a lot, about them when I get st

arted, but they will explain themselves, get themselves into their predicaments and figure out how to get out, somehow. I give them predicaments too, problems or bad situations, but those are dependent on the character, we make our own problems don't we?